Line data Source code
1 : /**************************************************************************
2 : * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 : * *
4 : * Author: The ALICE Off-line Project. *
5 : * Contributors are mentioned in the code where appropriate. *
6 : * *
7 : * Permission to use, copy, modify and distribute this software and its *
8 : * documentation strictly for non-commercial purposes is hereby granted *
9 : * without fee, provided that the above copyright notice appears in all *
10 : * copies and that both the copyright notice and this permission notice *
11 : * appear in the supporting documentation. The authors make no claims *
12 : * about the suitability of this software for any purpose. It is *
13 : * provided "as is" without express or implied warranty. *
14 : **************************************************************************/
15 :
16 : /* $Id: AliTRDseedV1.cxx 60233 2013-01-10 09:04:08Z abercuci $ */
17 :
18 : ////////////////////////////////////////////////////////////////////////////
19 : ////
20 : // The TRD offline tracklet
21 : //
22 : // The running horse of the TRD reconstruction. The following tasks are preformed:
23 : // 1. Clusters attachment to tracks based on prior information stored at tracklet level (see AttachClusters)
24 : // 2. Clusters position recalculation based on track information (see GetClusterXY and Fit)
25 : // 3. Cluster error parametrization recalculation (see Fit)
26 : // 4. Linear track approximation (Fit)
27 : // 5. Optimal position (including z estimate for pad row cross tracklets) and covariance matrix of the track fit inside one TRD chamber (Fit)
28 : // 6. Tilt pad correction and systematic effects (GetCovAt)
29 : // 7. dEdx calculation (CookdEdx)
30 : // 8. PID probabilities estimation (CookPID)
31 : //
32 : // Authors: //
33 : // Alex Bercuci <A.Bercuci@gsi.de> //
34 : // Markus Fasel <M.Fasel@gsi.de> //
35 : // //
36 : ////////////////////////////////////////////////////////////////////////////
37 :
38 : #include "TMath.h"
39 : #include "TGeoManager.h"
40 : #include "TTreeStream.h"
41 : #include "TGraphErrors.h"
42 :
43 : #include "AliLog.h"
44 : #include "AliMathBase.h"
45 : #include "AliRieman.h"
46 : #include "AliCDBManager.h"
47 :
48 : #include "AliTRDReconstructor.h"
49 : #include "AliTRDpadPlane.h"
50 : #include "AliTRDtransform.h"
51 : #include "AliTRDcluster.h"
52 : #include "AliTRDseedV1.h"
53 : #include "AliTRDtrackV1.h"
54 : #include "AliTRDcalibDB.h"
55 : #include "AliTRDchamberTimeBin.h"
56 : #include "AliTRDtrackingChamber.h"
57 : #include "AliTRDtrackerV1.h"
58 : #include "AliTRDrecoParam.h"
59 : #include "AliTRDCommonParam.h"
60 : #include "AliTRDtrackletOflHelper.h"
61 :
62 : #include "AliTRDCalTrkAttach.h"
63 : #include "AliTRDCalPID.h"
64 : #include "AliTRDCalROC.h"
65 : #include "AliTRDCalDet.h"
66 :
67 : class AliTracker;
68 :
69 48 : ClassImp(AliTRDseedV1)
70 :
71 : //____________________________________________________________________
72 : AliTRDseedV1::AliTRDseedV1(Int_t det)
73 369 : :AliTRDtrackletBase()
74 369 : ,fkReconstructor(NULL)
75 369 : ,fClusterIter(NULL)
76 369 : ,fExB(0.)
77 369 : ,fVD(0.)
78 369 : ,fT0(0.)
79 369 : ,fS2PRF(0.)
80 369 : ,fDiffL(0.)
81 369 : ,fDiffT(0.)
82 369 : ,fClusterIdx(0)
83 369 : ,fErrorMsg(0)
84 369 : ,fN(0)
85 369 : ,fDet(det)
86 369 : ,fPt(0.)
87 369 : ,fdX(0.)
88 369 : ,fX0(0.)
89 369 : ,fX(0.)
90 369 : ,fY(0.)
91 369 : ,fZ(0.)
92 369 : ,fS2Y(0.)
93 369 : ,fS2Z(0.)
94 369 : ,fChi2(0.)
95 1845 : {
96 : //
97 : // Constructor
98 : //
99 369 : memset(fIndexes,0xFF,kNclusters*sizeof(fIndexes[0]));
100 369 : memset(fClusters, 0, kNclusters*sizeof(AliTRDcluster*));
101 369 : memset(fPad, 0, 4*sizeof(Float_t));
102 369 : fYref[0] = 0.; fYref[1] = 0.;
103 369 : fZref[0] = 0.; fZref[1] = 0.;
104 369 : fYfit[0] = 0.; fYfit[1] = 0.;
105 369 : fZfit[0] = 0.; fZfit[1] = 0.;
106 369 : memset(fdEdx, 0, kNdEdxSlices*sizeof(Float_t));
107 4428 : for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
108 369 : fLabels[0]=-1; fLabels[1]=-1; // most freq MC labels
109 369 : fLabels[2]=0; // number of different labels for tracklet
110 369 : memset(fRefCov, 0, 7*sizeof(Double_t));
111 : // stand alone curvature
112 369 : fC[0] = 0.; fC[1] = 0.;
113 : // covariance matrix [diagonal]
114 : // default sy = 200um and sz = 2.3 cm
115 369 : fCov[0] = 4.e-4; fCov[1] = 0.; fCov[2] = 5.3;
116 369 : SetStandAlone(kFALSE);
117 738 : }
118 :
119 : //____________________________________________________________________
120 : AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref)
121 412 : :AliTRDtrackletBase((AliTRDtrackletBase&)ref)
122 412 : ,fkReconstructor(NULL)
123 412 : ,fClusterIter(NULL)
124 412 : ,fExB(0.)
125 412 : ,fVD(0.)
126 412 : ,fT0(0.)
127 412 : ,fS2PRF(0.)
128 412 : ,fDiffL(0.)
129 412 : ,fDiffT(0.)
130 412 : ,fClusterIdx(0)
131 412 : ,fErrorMsg(0)
132 412 : ,fN(0)
133 412 : ,fDet(-1)
134 412 : ,fPt(0.)
135 412 : ,fdX(0.)
136 412 : ,fX0(0.)
137 412 : ,fX(0.)
138 412 : ,fY(0.)
139 412 : ,fZ(0.)
140 412 : ,fS2Y(0.)
141 412 : ,fS2Z(0.)
142 412 : ,fChi2(0.)
143 2060 : {
144 : //
145 : // Copy Constructor performing a deep copy
146 : //
147 412 : if(this != &ref){
148 412 : ref.Copy(*this);
149 : }
150 412 : SetBit(kOwner, kFALSE);
151 824 : SetStandAlone(ref.IsStandAlone());
152 824 : }
153 :
154 :
155 : //____________________________________________________________________
156 : AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref)
157 : {
158 : //
159 : // Assignment Operator using the copy function
160 : //
161 :
162 0 : if(this != &ref){
163 0 : ref.Copy(*this);
164 0 : }
165 0 : SetBit(kOwner, kFALSE);
166 :
167 0 : return *this;
168 : }
169 :
170 : //____________________________________________________________________
171 : AliTRDseedV1::~AliTRDseedV1()
172 3950 : {
173 : //
174 : // Destructor. The RecoParam object belongs to the underlying tracker.
175 : //
176 :
177 : //printf("I-AliTRDseedV1::~AliTRDseedV1() : Owner[%s]\n", IsOwner()?"YES":"NO");
178 :
179 1562 : if(IsOwner()) {
180 25956 : for(int itb=0; itb<kNclusters; itb++){
181 12772 : if(!fClusters[itb]) continue;
182 : //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb));
183 8960 : delete fClusters[itb];
184 4480 : fClusters[itb] = NULL;
185 4480 : }
186 206 : }
187 1975 : }
188 :
189 : //____________________________________________________________________
190 : void AliTRDseedV1::Copy(TObject &ref) const
191 : {
192 : //
193 : // Copy function
194 : //
195 :
196 : //AliInfo("");
197 824 : AliTRDseedV1 &target = (AliTRDseedV1 &)ref;
198 :
199 412 : target.fkReconstructor = fkReconstructor;
200 412 : target.fClusterIter = NULL;
201 412 : target.fExB = fExB;
202 412 : target.fVD = fVD;
203 412 : target.fT0 = fT0;
204 412 : target.fS2PRF = fS2PRF;
205 412 : target.fDiffL = fDiffL;
206 412 : target.fDiffT = fDiffT;
207 412 : target.fClusterIdx = 0;
208 412 : target.fErrorMsg = fErrorMsg;
209 412 : target.fN = fN;
210 412 : target.fDet = fDet;
211 412 : target.fPt = fPt;
212 412 : target.fdX = fdX;
213 412 : target.fX0 = fX0;
214 412 : target.fX = fX;
215 412 : target.fY = fY;
216 412 : target.fZ = fZ;
217 412 : target.fS2Y = fS2Y;
218 412 : target.fS2Z = fS2Z;
219 412 : target.fChi2 = fChi2;
220 :
221 412 : memcpy(target.fIndexes, fIndexes, kNclusters*sizeof(Int_t));
222 412 : memcpy(target.fClusters, fClusters, kNclusters*sizeof(AliTRDcluster*));
223 412 : memcpy(target.fPad, fPad, 4*sizeof(Float_t));
224 412 : target.fYref[0] = fYref[0]; target.fYref[1] = fYref[1];
225 412 : target.fZref[0] = fZref[0]; target.fZref[1] = fZref[1];
226 412 : target.fYfit[0] = fYfit[0]; target.fYfit[1] = fYfit[1];
227 412 : target.fZfit[0] = fZfit[0]; target.fZfit[1] = fZfit[1];
228 412 : memcpy(target.fdEdx, fdEdx, kNdEdxSlices*sizeof(Float_t));
229 412 : memcpy(target.fProb, fProb, AliPID::kSPECIES*sizeof(Float_t));
230 412 : memcpy(target.fLabels, fLabels, 3*sizeof(Int_t));
231 412 : memcpy(target.fRefCov, fRefCov, 7*sizeof(Double_t));
232 412 : target.fC[0] = fC[0]; target.fC[1] = fC[1];
233 412 : memcpy(target.fCov, fCov, 3*sizeof(Double_t));
234 :
235 412 : TObject::Copy(ref);
236 412 : }
237 :
238 :
239 : //____________________________________________________________
240 : void AliTRDseedV1::Init(const AliRieman *rieman)
241 : {
242 : // Initialize this tracklet using the riemann fit information
243 :
244 :
245 0 : fZref[0] = rieman->GetZat(fX0);
246 0 : fZref[1] = rieman->GetDZat(fX0);
247 0 : fYref[0] = rieman->GetYat(fX0);
248 0 : fYref[1] = rieman->GetDYat(fX0);
249 0 : if(fkReconstructor && fkReconstructor->IsHLT()){
250 0 : fRefCov[0] = 1;
251 0 : fRefCov[2] = 10;
252 0 : }else{
253 0 : fRefCov[0] = rieman->GetErrY(fX0);
254 0 : fRefCov[2] = rieman->GetErrZ(fX0);
255 : }
256 0 : fC[0] = rieman->GetC();
257 0 : fChi2 = rieman->GetChi2();
258 0 : }
259 :
260 :
261 : //____________________________________________________________
262 : Bool_t AliTRDseedV1::Init(const AliTRDtrackV1 *track)
263 : {
264 : // Initialize this tracklet using the track information
265 : //
266 : // Parameters:
267 : // track - the TRD track used to initialize the tracklet
268 : //
269 : // Detailed description
270 : // The function sets the starting point and direction of the
271 : // tracklet according to the information from the TRD track.
272 : //
273 : // Caution
274 : // The TRD track has to be propagated to the beginning of the
275 : // chamber where the tracklet will be constructed
276 : //
277 :
278 524 : Double_t y, z;
279 262 : if(!track->GetProlongation(fX0, y, z)) return kFALSE;
280 262 : Update(track);
281 262 : return kTRUE;
282 262 : }
283 :
284 :
285 : //_____________________________________________________________________________
286 : void AliTRDseedV1::Reset(Option_t *opt)
287 : {
288 : //
289 : // Reset seed. If option opt="c" is given only cluster arrays are cleared.
290 : //
291 0 : for(Int_t ic=kNclusters; ic--;) fIndexes[ic] = -1;
292 0 : memset(fClusters, 0, kNclusters*sizeof(AliTRDcluster*));
293 0 : fN=0; SetBit(kRowCross, kFALSE);
294 0 : if(strcmp(opt, "c")==0) return;
295 :
296 0 : fExB=0.;fVD=0.;fT0=0.;fS2PRF=0.;
297 0 : fDiffL=0.;fDiffT=0.;
298 0 : fClusterIdx=0;
299 0 : fErrorMsg = 0;
300 0 : fDet=-1;
301 0 : fPt=0.;
302 0 : fdX=0.;fX0=0.; fX=0.; fY=0.; fZ=0.;
303 0 : fS2Y=0.; fS2Z=0.;
304 0 : fC[0]=0.; fC[1]=0.;
305 0 : fChi2 = 0.;
306 :
307 0 : memset(fPad, 0, 4*sizeof(Float_t));
308 0 : fYref[0] = 0.; fYref[1] = 0.;
309 0 : fZref[0] = 0.; fZref[1] = 0.;
310 0 : fYfit[0] = 0.; fYfit[1] = 0.;
311 0 : fZfit[0] = 0.; fZfit[1] = 0.;
312 0 : memset(fdEdx, 0, kNdEdxSlices*sizeof(Float_t));
313 0 : for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.;
314 0 : fLabels[0]=-1; fLabels[1]=-1; // most freq MC labels
315 0 : fLabels[2]=0; // number of different labels for tracklet
316 0 : memset(fRefCov, 0, 7*sizeof(Double_t));
317 : // covariance matrix [diagonal]
318 : // default sy = 200um and sz = 2.3 cm
319 0 : fCov[0] = 4.e-4; fCov[1] = 0.; fCov[2] = 5.3;
320 0 : }
321 :
322 : //____________________________________________________________________
323 : void AliTRDseedV1::Update(const AliTRDtrackV1 *trk)
324 : {
325 : // update tracklet reference position from the TRD track
326 :
327 524 : Double_t fSnp = trk->GetSnp();
328 262 : Double_t fTgl = trk->GetTgl();
329 262 : fPt = trk->Pt();
330 262 : Double_t norm =1./TMath::Sqrt((1.-fSnp)*(1.+fSnp));
331 262 : fYref[1] = fSnp*norm;
332 262 : fZref[1] = fTgl*norm;
333 262 : SetCovRef(trk->GetCovariance());
334 :
335 262 : Double_t dx = trk->GetX() - fX0;
336 262 : fYref[0] = trk->GetY() - dx*fYref[1];
337 262 : fZref[0] = trk->GetZ() - dx*fZref[1];
338 262 : }
339 :
340 : //_____________________________________________________________________________
341 : void AliTRDseedV1::UpdateUsed()
342 : {
343 : //
344 : // Calculate number of used clusers in the tracklet
345 : //
346 :
347 : Int_t nused = 0, nshared = 0;
348 14820 : for (Int_t i = kNclusters; i--; ) {
349 14136 : if (!fClusters[i]) continue;
350 4968 : if(fClusters[i]->IsUsed()){
351 0 : nused++;
352 4968 : } else if(fClusters[i]->IsShared()){
353 0 : if(IsStandAlone()) nused++;
354 0 : else nshared++;
355 : }
356 : }
357 228 : SetNUsed(nused);
358 228 : SetNShared(nshared);
359 228 : }
360 :
361 : //_____________________________________________________________________________
362 : void AliTRDseedV1::UseClusters()
363 : {
364 : //
365 : // Use clusters
366 : //
367 : // In stand alone mode:
368 : // Clusters which are marked as used or shared from another track are
369 : // removed from the tracklet
370 : //
371 : // In barrel mode:
372 : // - Clusters which are used by another track become shared
373 : // - Clusters which are attached to a kink track become shared
374 : //
375 412 : AliTRDcluster **c = &fClusters[0];
376 25956 : for (Int_t ic=kNclusters; ic--; c++) {
377 12772 : if(!(*c)) continue;
378 8960 : if(IsStandAlone()){
379 4480 : if((*c)->IsShared() || (*c)->IsUsed()){
380 0 : if((*c)->IsShared()) SetNShared(GetNShared()-1);
381 0 : else SetNUsed(GetNUsed()-1);
382 0 : (*c) = NULL;
383 0 : fIndexes[ic] = -1;
384 0 : SetN(GetN()-1);
385 0 : continue;
386 : }
387 : } else {
388 8960 : if((*c)->IsUsed() || IsKink()){
389 0 : (*c)->SetShared();
390 0 : continue;
391 : }
392 : }
393 4480 : (*c)->Use();
394 4480 : }
395 206 : }
396 :
397 :
398 :
399 : //____________________________________________________________________
400 : void AliTRDseedV1::CookdEdx(Int_t nslices)
401 : {
402 : // Calculates average dE/dx for all slices and store them in the internal array fdEdx.
403 : //
404 : // Parameters:
405 : // nslices : number of slices for which dE/dx should be calculated
406 : // Output:
407 : // store results in the internal array fdEdx. This can be accessed with the method
408 : // AliTRDseedV1::GetdEdx()
409 : //
410 : // Detailed description
411 : // Calculates average dE/dx for all slices. Depending on the PID methode
412 : // the number of slices can be 3 (LQ) or 8(NN).
413 : // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t))
414 : //
415 : // The following effects are included in the calculation:
416 : // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice)
417 : // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing())
418 : // 3. cluster size
419 : //
420 :
421 412 : memset(fdEdx, 0, kNdEdxSlices*sizeof(Float_t));
422 206 : const Double_t kDriftLength = (.5 * AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
423 :
424 : AliTRDcluster *c(NULL);
425 11536 : for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){
426 6808 : if(!(c = fClusters[ic]) && !(c = fClusters[ic+kNtb])) continue;
427 4444 : Float_t dx = TMath::Abs(fX0 - c->GetX());
428 :
429 : // Filter clusters for dE/dx calculation
430 :
431 : // 1.consider calibration effects for slice determination
432 : Int_t slice;
433 4444 : if(dx<kDriftLength){ // TODO should be replaced by c->IsInChamber()
434 4300 : slice = Int_t(dx * nslices / kDriftLength);
435 4444 : } else slice = c->GetX() < fX0 ? nslices-1 : 0;
436 :
437 :
438 : // 2. take sharing into account
439 : Float_t w = /*c->IsShared() ? .5 :*/ 1.;
440 :
441 : // 3. take into account large clusters TODO
442 : //w *= c->GetNPads() > 3 ? .8 : 1.;
443 :
444 : //CHECK !!!
445 4444 : fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic];
446 4444 : } // End of loop over clusters
447 206 : }
448 :
449 : //_____________________________________________________________________________
450 : void AliTRDseedV1::CookLabels()
451 : {
452 : //
453 : // Cook 2 labels for seed
454 : //
455 :
456 0 : Int_t labels[200];
457 0 : Int_t out[200];
458 : Int_t nlab = 0;
459 0 : for (Int_t i = 0; i < kNclusters; i++) {
460 0 : if (!fClusters[i]) continue;
461 0 : for (Int_t ilab = 0; ilab < 3; ilab++) {
462 0 : if (fClusters[i]->GetLabel(ilab) >= 0) {
463 0 : labels[nlab] = fClusters[i]->GetLabel(ilab);
464 0 : nlab++;
465 0 : }
466 : }
467 0 : }
468 :
469 0 : fLabels[2] = AliMathBase::Freq(nlab,labels,out,kTRUE);
470 0 : fLabels[0] = out[0];
471 0 : if ((fLabels[2] > 1) && (out[3] > 1)) fLabels[1] = out[2];
472 0 : }
473 :
474 : //____________________________________________________________
475 : Float_t AliTRDseedV1::GetAnodeWireOffset(Float_t zt)
476 : {
477 : // Find position inside the amplification cell for reading drift velocity map
478 :
479 0 : Float_t d = fPad[3] - zt;
480 0 : if(d<0.){
481 0 : AliError(Form("Fail AnodeWireOffset calculation z0[%+7.2f] zt[%+7.2f] d[%+7.2f].", fPad[3], zt, d));
482 0 : return 0.125;
483 : }
484 0 : d -= ((Int_t)(2 * d)) / 2.0;
485 0 : if(d > 0.25) d = 0.5 - d;
486 0 : return d;
487 0 : }
488 :
489 :
490 : //____________________________________________________________________
491 : Float_t AliTRDseedV1::GetCharge(Bool_t useOutliers) const
492 : {
493 : // Computes total charge attached to tracklet. If "useOutliers" is set clusters
494 : // which are not in chamber are also used (default false)
495 :
496 : AliTRDcluster *c(NULL); Float_t qt(0.);
497 51912 : for(int ic=0; ic<kNclusters; ic++){
498 25544 : if(!(c=fClusters[ic])) continue;
499 9516 : if(!c->IsInChamber() && !useOutliers) continue;
500 8960 : qt += TMath::Abs(c->GetQ());
501 8960 : }
502 412 : return qt;
503 : }
504 :
505 : //____________________________________________________________________
506 : Int_t AliTRDseedV1::GetChargeGaps(Float_t sz[kNtb], Float_t pos[kNtb], Int_t isz[kNtb]) const
507 : {
508 : // Find number, size and position of charge gaps (consecutive missing time bins).
509 : // Returns the number of gaps and fills their size in input array "sz" and position in array "pos"
510 :
511 : Bool_t gap(kFALSE);
512 : Int_t n(0);
513 0 : Int_t ipos[kNtb]; memset(isz, 0, kNtb*sizeof(Int_t));memset(ipos, 0, kNtb*sizeof(Int_t));
514 0 : for(int ic(0); ic<kNtb; ic++){
515 0 : if(fClusters[ic] || fClusters[ic+kNtb]){
516 0 : if(gap) n++;
517 : continue;
518 : }
519 : gap = kTRUE;
520 0 : isz[n]++;
521 0 : ipos[n] = ic;
522 0 : }
523 0 : if(!n) return 0;
524 :
525 : // write calibrated values
526 0 : AliTRDcluster fake;
527 0 : for(Int_t igap(0); igap<n; igap++){
528 0 : sz[igap] = isz[igap]*fVD/AliTRDCommonParam::Instance()->GetSamplingFrequency();
529 0 : fake.SetPadTime(ipos[igap]);
530 0 : pos[igap] = fake.GetXloc(fT0, fVD);
531 0 : if(isz[igap]>1){
532 0 : fake.SetPadTime(ipos[igap]-isz[igap]+1);
533 0 : pos[igap] += fake.GetXloc(fT0, fVD);
534 0 : pos[igap] /= 2.;
535 0 : }
536 : }
537 : return n;
538 0 : }
539 :
540 :
541 : //____________________________________________________________________
542 : Double_t AliTRDseedV1::EstimatedCrossPoint(AliTRDpadPlane *pp, Float_t bz)
543 : {
544 : // Algorithm to estimate cross point in the x-z plane for pad row cross tracklets or the z coordinate of pad row without pad row cross in the local chamber coordinates.
545 : // Returns variance of the radial offset from anode wire in case of raw cross or 0 otherwise.
546 :
547 : Int_t row[] = {-1, -1};
548 456 : Double_t zoff(0.5 * (pp->GetRow0() + pp->GetRowEnd())), sx(0.), mean(0.5*pp->GetNrows()-0.5);
549 : AliTRDcluster *c(NULL);
550 228 : fS2Y = 0.;
551 :
552 228 : if(!IsRowCross()){
553 1396 : for(int ic=0; ic<kNtb; ic++){
554 698 : if(!(c=fClusters[ic])) continue;
555 354 : if(!c->IsInChamber()) continue;
556 214 : row[0] = c->GetPadRow();
557 428 : fZfit[0] = Int_t(mean-row[0])*pp->GetLengthIPad() +
558 856 : 0.5*(mean-row[0]>0.?1.:-1.)*(row[0]>0&&row[0]<pp->GetNrows()-1?pp->GetLengthIPad():pp->GetLengthOPad());
559 214 : break;
560 : }
561 214 : } else {
562 : Float_t tbm[2] = {0.}; // mean value of time bin in rows
563 14 : Int_t tb[kNtb]={0}, //array of time bins from first row
564 : nc[2] = {0}, // no. of clusters in rows
565 : mc(0); // no. of common clusters
566 : Bool_t w[2] = {kFALSE, kFALSE}; // acceptance flag for rows
567 : // Find radial range for first row
568 896 : for(int ic(0); ic<kNtb; ic++){
569 434 : tb[ic]= -1;
570 618 : if(!(c=fClusters[ic]) || !c->IsInChamber()) continue;
571 180 : if(row[0]<0) row[0] = c->GetPadRow();
572 166 : tb[nc[0]++] = ic; tbm[0] += ic;
573 166 : }
574 14 : if(nc[0]>2){
575 14 : tbm[0] /= nc[0];
576 : w[0] = kTRUE;
577 14 : }
578 : // Find radial range for second row
579 896 : for(int ic(kNtb), jc(0); ic<kNclusters; ic++, jc++){
580 598 : if(!(c=fClusters[ic]) || !c->IsInChamber()) continue;
581 170 : if(row[1]<0) row[1] = c->GetPadRow();
582 156 : tbm[1] += jc; nc[1]++;
583 3266 : for(Int_t kc(0); kc<nc[0]; kc++)
584 1450 : if(tb[kc]==jc){
585 34 : tb[kc] += 100; // mark common cluster
586 34 : mc++;
587 34 : break;
588 : }
589 156 : }
590 14 : if(nc[1]>2){
591 14 : tbm[1] /= nc[1];
592 : w[1] = kTRUE;
593 14 : }
594 : //printf("0 : %f[%2d] 1 : %f[%2d] mc[%d]\n", tbm[0], nc[0], tbm[1], nc[1], mc);
595 14 : if(!w[0] && !w[1]){
596 0 : AliError("Too few clusters to estimate tracklet.");
597 0 : return -1;
598 : }
599 28 : if(!w[0] || !w[1]){
600 0 : SetBit(kRowCross, kFALSE); // reset RC bit
601 0 : if(w[1]) row[0] = row[1];
602 0 : fZfit[0] = Int_t(mean-row[0])*pp->GetLengthIPad() +
603 0 : 0.5*(mean-row[0]>0.?1.:-1.)*(row[0]>0&&row[0]<pp->GetNrows()-1?pp->GetLengthIPad():pp->GetLengthOPad());
604 0 : }else{ // find the best matching timebin
605 14 : fZfit[0] = Int_t(mean-0.5*(row[0]+row[1]))*pp->GetLengthIPad();
606 : Int_t itb(0), dtb(0);
607 14 : if(!mc) { // no common range
608 6 : itb = Int_t(0.5*(tbm[0] + tbm[1]));
609 6 : dtb = Int_t(0.5*TMath::Abs(tbm[0] - tbm[1])); // simple parameterization of the cluster gap
610 6 : } else {
611 : Double_t rmax(100.); Int_t itbStart(-1), itbStop(0);
612 : // compute distance from
613 204 : for(Int_t jc(0); jc<nc[0]; jc++){
614 94 : if(tb[jc] < 100) continue;
615 34 : Int_t ltb(tb[jc]-100);
616 34 : Double_t r = (1. - ltb/tbm[0])*(1. - ltb/tbm[1]);
617 : //printf("tb[%2d] dr[%f %f %f] rmax[%f]\n", ltb, r, 1. - ltb/tbm[0], 1. - ltb/tbm[1], rmax);
618 56 : if(TMath::Abs(r)<rmax){ rmax = TMath::Abs(r); itb = ltb; }
619 42 : if(itbStart<0) itbStart = ltb;
620 : itbStop = ltb;
621 34 : }
622 8 : dtb = itbStop-itbStart+1;
623 : }
624 14 : AliTRDCommonParam *cp = AliTRDCommonParam::Instance();
625 42 : Double_t freq(cp?cp->GetSamplingFrequency():10.);
626 14 : fS2Y = ((itb-0.5)/freq - fT0 - 0.189)*fVD; // xOff
627 14 : sx = dtb*0.288675134594812921/freq; sx *= sx; sx += 1.56e-2; sx *= fVD*fVD;
628 : }
629 28 : }
630 :
631 : // estimate dzdx
632 228 : Float_t dx(fX0-fS2Y);
633 228 : fZfit[1] = (fZfit[0]+zoff)/dx;
634 :
635 : // correct dzdx for the bias
636 228 : UnbiasDZDX(IsRowCross(), bz);
637 228 : if(IsRowCross()){
638 : // correct x_cross/sigma(x_cross) for the bias in dzdx
639 14 : const AliTRDrecoParam* const recoParam = fkReconstructor->GetRecoParam();
640 14 : if(recoParam){
641 14 : fS2Y += recoParam->GetCorrDZDXxcross()*TMath::Abs(fZfit[1]);
642 14 : sx += recoParam->GetCorrDZDXxcross()*recoParam->GetCorrDZDXxcross()*GetS2DZDX(fZfit[1]);
643 14 : }
644 : // correct sigma(x_cross) for the width of the crossing area
645 14 : sx += GetS2XcrossDZDX(TMath::Abs(fZfit[1]));
646 :
647 : // estimate z and error @ anode wire
648 14 : fZfit[0] += fZfit[1]*fS2Y;
649 14 : fS2Z = fZfit[1]*fZfit[1]*sx+fS2Y*fS2Y*GetS2DZDX(fZfit[1]);
650 14 : }
651 : return sx;
652 228 : }
653 :
654 : //____________________________________________________________________
655 : void AliTRDseedV1::UnbiasDZDX(Bool_t rc, Float_t bz)
656 : {
657 : // correct dzdx for the bias in z according to MC
658 228 : const AliTRDrecoParam* const recoParam = fkReconstructor->GetRecoParam();
659 228 : if(!recoParam) return;
660 228 : fZfit[1] *= recoParam->GetCorrDZDX(rc)-(bz>0?0.01:0.);
661 242 : if(rc) fZfit[1] += recoParam->GetCorrDZDXbiasRC(fZfit[1]<0);
662 456 : }
663 :
664 : //____________________________________________________________________
665 : Double_t AliTRDseedV1::UnbiasY(Bool_t rc, Float_t bz)
666 : {
667 : // correct y coordinate for tail cancellation. This should be fixed by considering TC as a function of q/pt.
668 : // rc : TRUE if tracklet crosses rows
669 : // bz : magnetic field z component
670 :
671 228 : const AliTRDrecoParam* const recoParam = fkReconstructor->GetRecoParam();
672 228 : if(!recoParam) return 0.;
673 228 : Double_t par[3]={0.};
674 228 : Int_t idx(2*(rc?1:0)+Int_t(bz>0));
675 228 : recoParam->GetYcorrTailCancel(idx, par);
676 228 : return par[0]*TMath::Sin(par[1]*fYref[1])+par[2];
677 456 : }
678 :
679 :
680 : //____________________________________________________________________
681 : Float_t AliTRDseedV1::GetQperTB(Int_t tb) const
682 : {
683 : //
684 : // Charge of the clusters at timebin
685 : //
686 : Float_t q = 0;
687 0 : if(fClusters[tb] /*&& fClusters[tb]->IsInChamber()*/)
688 0 : q += TMath::Abs(fClusters[tb]->GetQ());
689 0 : if(fClusters[tb+kNtb] /*&& fClusters[tb+kNtb]->IsInChamber()*/)
690 0 : q += TMath::Abs(fClusters[tb+kNtb]->GetQ());
691 0 : return q/TMath::Sqrt(1. + fYref[1]*fYref[1] + fZref[1]*fZref[1]);
692 : }
693 :
694 : //____________________________________________________________________
695 : Float_t AliTRDseedV1::GetdQdl() const
696 : {
697 : // Calculate total charge / tracklet length for 1D PID
698 : //
699 824 : Float_t Q = GetCharge(kTRUE);
700 412 : return Q/TMath::Sqrt(1. + fYref[1]*fYref[1] + fZref[1]*fZref[1]);
701 : }
702 :
703 : //____________________________________________________________________
704 : Float_t AliTRDseedV1::GetdQdl(Int_t ic, Float_t *dl) const
705 : {
706 : // Using the linear approximation of the track inside one TRD chamber (TRD tracklet)
707 : // the charge per unit length can be written as:
708 : // BEGIN_LATEX
709 : // #frac{dq}{dl} = #frac{q_{c}}{dx * #sqrt{1 + #(){#frac{dy}{dx}}^{2}_{fit} + #(){#frac{dz}{dx}}^{2}_{ref}}}
710 : // END_LATEX
711 : // where qc is the total charge collected in the current time bin and dx is the length
712 : // of the time bin.
713 : // The following correction are applied :
714 : // - charge : pad row cross corrections
715 : // [diffusion and TRF assymetry] TODO
716 : // - dx : anisochronity, track inclination - see Fit and AliTRDcluster::GetXloc()
717 : // and AliTRDcluster::GetYloc() for the effects taken into account
718 : //
719 : //Begin_Html
720 : //<img src="TRD/trackletDQDT.gif">
721 : //End_Html
722 : // In the picture the energy loss measured on the tracklet as a function of drift time [left] and respectively
723 : // drift length [right] for different particle species is displayed.
724 : // Author : Alex Bercuci <A.Bercuci@gsi.de>
725 : //
726 : Float_t dq = 0.;
727 : // check whether both clusters are inside the chamber
728 : Bool_t hasClusterInChamber = kFALSE;
729 13204 : if(fClusters[ic] && fClusters[ic]->IsInChamber()){
730 : hasClusterInChamber = kTRUE;
731 4046 : dq += TMath::Abs(fClusters[ic]->GetQ());
732 4046 : }
733 4608 : if(fClusters[ic+kNtb] && fClusters[ic+kNtb]->IsInChamber()){
734 : hasClusterInChamber = kTRUE;
735 156 : dq += TMath::Abs(fClusters[ic+kNtb]->GetQ());
736 156 : }
737 4720 : if(!hasClusterInChamber) return 0.;
738 4168 : if(dq<1.e-3) return 0.;
739 :
740 4168 : Double_t dx = fdX;
741 8336 : if(ic-1>=0 && ic+1<kNtb){
742 : Float_t x2(0.), x1(0.);
743 : // try to estimate upper radial position (find the cluster which is inside the chamber)
744 11706 : if(fClusters[ic-1] && fClusters[ic-1]->IsInChamber()) x2 = fClusters[ic-1]->GetX();
745 695 : else if(fClusters[ic-1+kNtb] && fClusters[ic-1+kNtb]->IsInChamber()) x2 = fClusters[ic-1+kNtb]->GetX();
746 1003 : else if(fClusters[ic] && fClusters[ic]->IsInChamber()) x2 = fClusters[ic]->GetX()+fdX;
747 10 : else x2 = fClusters[ic+kNtb]->GetX()+fdX;
748 : // try to estimate lower radial position (find the cluster which is inside the chamber)
749 11683 : if(fClusters[ic+1] && fClusters[ic+1]->IsInChamber()) x1 = fClusters[ic+1]->GetX();
750 677 : else if(fClusters[ic+1+kNtb] && fClusters[ic+1+kNtb]->IsInChamber()) x1 = fClusters[ic+1+kNtb]->GetX();
751 1011 : else if(fClusters[ic] && fClusters[ic]->IsInChamber()) x1 = fClusters[ic]->GetX()-fdX;
752 6 : else x1 = fClusters[ic+kNtb]->GetX()-fdX;
753 :
754 4168 : dx = .5*(x2 - x1);
755 4168 : }
756 4168 : dx *= TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]);
757 4168 : if(dl) (*dl) = dx;
758 8336 : if(dx>1.e-9) return dq/dx;
759 0 : else return 0.;
760 4444 : }
761 :
762 : //____________________________________________________________
763 : Float_t AliTRDseedV1::GetMomentum(Float_t *err) const
764 : {
765 : // Returns momentum of the track after update with the current tracklet as:
766 : // BEGIN_LATEX
767 : // p=#frac{1}{1/p_{t}} #sqrt{1+tgl^{2}}
768 : // END_LATEX
769 : // and optionally the momentum error (if err is not null).
770 : // The estimated variance of the momentum is given by:
771 : // BEGIN_LATEX
772 : // #sigma_{p}^{2} = (#frac{dp}{dp_{t}})^{2} #sigma_{p_{t}}^{2}+(#frac{dp}{dtgl})^{2} #sigma_{tgl}^{2}+2#frac{dp}{dp_{t}}#frac{dp}{dtgl} cov(tgl,1/p_{t})
773 : // END_LATEX
774 : // which can be simplified to
775 : // BEGIN_LATEX
776 : // #sigma_{p}^{2} = p^{2}p_{t}^{4}tgl^{2}#sigma_{tgl}^{2}-2p^{2}p_{t}^{3}tgl cov(tgl,1/p_{t})+p^{2}p_{t}^{2}#sigma_{1/p_{t}}^{2}
777 : // END_LATEX
778 : //
779 :
780 824 : Double_t p = fPt*TMath::Sqrt(1.+fZref[1]*fZref[1]);
781 412 : if(err){
782 206 : Double_t p2 = p*p;
783 206 : Double_t tgl2 = fZref[1]*fZref[1];
784 206 : Double_t pt2 = fPt*fPt;
785 : Double_t s2 =
786 206 : p2*tgl2*pt2*pt2*fRefCov[4]
787 206 : -2.*p2*fZref[1]*fPt*pt2*fRefCov[5]
788 206 : +p2*pt2*fRefCov[6];
789 206 : (*err) = TMath::Sqrt(s2);
790 206 : }
791 412 : return p;
792 : }
793 :
794 :
795 : //____________________________________________________________________
796 : Int_t AliTRDseedV1::GetTBoccupancy() const
797 : {
798 : // Returns no. of TB occupied by clusters
799 :
800 : Int_t n(0);
801 57850 : for(int ic(0); ic<kNtb; ic++){
802 36552 : if(!fClusters[ic] && !fClusters[ic+kNtb]) continue;
803 19272 : n++;
804 19272 : }
805 890 : return n;
806 : }
807 :
808 : //____________________________________________________________________
809 : Int_t AliTRDseedV1::GetTBcross() const
810 : {
811 : // Returns no. of TB occupied by 2 clusters for pad row cross tracklets
812 :
813 28 : if(!IsRowCross()) return 0;
814 : Int_t n(0);
815 896 : for(int ic(0); ic<kNtb; ic++){
816 654 : if(fClusters[ic] && fClusters[ic+kNtb]) n++;
817 : }
818 : return n;
819 14 : }
820 :
821 : //____________________________________________________________________
822 : Float_t* AliTRDseedV1::GetProbability(Bool_t force)
823 : {
824 0 : if(!force) return &fProb[0];
825 0 : if(!CookPID()) return NULL;
826 0 : return &fProb[0];
827 0 : }
828 :
829 : //____________________________________________________________
830 : Bool_t AliTRDseedV1::CookPID()
831 : {
832 : // Fill probability array for tracklet from the DB.
833 : //
834 : // Parameters
835 : //
836 : // Output
837 : // returns pointer to the probability array and NULL if missing DB access
838 : //
839 : // Retrieve PID probabilities for e+-, mu+-, K+-, pi+- and p+- from the DB according to tracklet information:
840 : // - estimated momentum at tracklet reference point
841 : // - dE/dx measurements
842 : // - tracklet length
843 : // - TRD layer
844 : // According to the steering settings specified in the reconstruction one of the following methods are used
845 : // - Neural Network [default] - option "nn"
846 : // - 2D Likelihood - option "!nn"
847 :
848 0 : AliWarning(Form("Obsolete function. Use AliTRDPIDResponse::GetResponse() instead."));
849 :
850 0 : AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
851 0 : if (!calibration) {
852 0 : AliError("No access to calibration data");
853 0 : return kFALSE;
854 : }
855 :
856 0 : if (!fkReconstructor) {
857 0 : AliError("Reconstructor not set.");
858 0 : return kFALSE;
859 : }
860 :
861 : // Retrieve the CDB container class with the parametric detector response
862 0 : const AliTRDCalPID *pd = calibration->GetPIDObject(fkReconstructor->GetPIDMethod());
863 0 : if (!pd) {
864 0 : AliError("No access to AliTRDCalPID object");
865 0 : return kFALSE;
866 : }
867 :
868 : // calculate tracklet length TO DO
869 0 : Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick())/ TMath::Sqrt((1.0 - GetSnp()*GetSnp()) / (1.0 + GetTgl()*GetTgl()));
870 :
871 : //calculate dE/dx
872 0 : CookdEdx(AliTRDCalPID::kNSlicesNN);
873 0 : AliDebug(4, Form("p=%6.4f[GeV/c] dEdx{%7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f %7.2f} l=%4.2f[cm]", GetMomentum(), fdEdx[0], fdEdx[1], fdEdx[2], fdEdx[3], fdEdx[4], fdEdx[5], fdEdx[6], fdEdx[7], length));
874 :
875 : // Sets the a priori probabilities
876 0 : Bool_t kPIDNN(fkReconstructor->GetPIDMethod()==AliTRDpidUtil::kNN);
877 0 : for(int ispec=0; ispec<AliPID::kSPECIES; ispec++)
878 0 : fProb[ispec] = pd->GetProbability(ispec, GetMomentum(), &fdEdx[0], length, kPIDNN?GetPlane():fkReconstructor->GetRecoParam()->GetPIDLQslices());
879 :
880 : return kTRUE;
881 0 : }
882 :
883 : //____________________________________________________________________
884 : Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const
885 : {
886 : //
887 : // Returns a quality measurement of the current seed
888 : //
889 :
890 0 : Float_t zcorr = kZcorr ? GetTilt() * (fZfit[0] - fZref[0]) : 0.;
891 0 : return
892 0 : .5 * TMath::Abs(18.0 - GetN())
893 0 : + 10.* TMath::Abs(fYfit[1] - fYref[1])
894 0 : + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr)
895 0 : + 2. * TMath::Abs(fZfit[0] - fZref[0]) / GetPadLength();
896 : }
897 :
898 : //____________________________________________________________________
899 : void AliTRDseedV1::GetCovAt(Double_t /*x*/, Double_t *cov) const
900 : {
901 : // Computes covariance in the y-z plane at radial point x (in tracking coordinates)
902 : // and returns the results in the preallocated array cov[3] as :
903 : // cov[0] = Var(y)
904 : // cov[1] = Cov(yz)
905 : // cov[2] = Var(z)
906 : //
907 : // Details
908 : //
909 : // For the linear transformation
910 : // BEGIN_LATEX
911 : // Y = T_{x} X^{T}
912 : // END_LATEX
913 : // The error propagation has the general form
914 : // BEGIN_LATEX
915 : // C_{Y} = T_{x} C_{X} T_{x}^{T}
916 : // END_LATEX
917 : // We apply this formula 2 times. First to calculate the covariance of the tracklet
918 : // at point x we consider:
919 : // BEGIN_LATEX
920 : // T_{x} = (1 x); X=(y0 dy/dx); C_{X}=#(){#splitline{Var(y0) Cov(y0, dy/dx)}{Cov(y0, dy/dx) Var(dy/dx)}}
921 : // END_LATEX
922 : // and secondly to take into account the tilt angle
923 : // BEGIN_LATEX
924 : // T_{#alpha} = #(){#splitline{cos(#alpha) __ sin(#alpha)}{-sin(#alpha) __ cos(#alpha)}}; X=(y z); C_{X}=#(){#splitline{Var(y) 0}{0 Var(z)}}
925 : // END_LATEX
926 : //
927 : // using simple trigonometrics one can write for this last case
928 : // BEGIN_LATEX
929 : // C_{Y}=#frac{1}{1+tg^{2}#alpha} #(){#splitline{(#sigma_{y}^{2}+tg^{2}#alpha#sigma_{z}^{2}) __ tg#alpha(#sigma_{z}^{2}-#sigma_{y}^{2})}{tg#alpha(#sigma_{z}^{2}-#sigma_{y}^{2}) __ (#sigma_{z}^{2}+tg^{2}#alpha#sigma_{y}^{2})}}
930 : // END_LATEX
931 : // which can be aproximated for small alphas (2 deg) with
932 : // BEGIN_LATEX
933 : // C_{Y}=#(){#splitline{#sigma_{y}^{2} __ (#sigma_{z}^{2}-#sigma_{y}^{2})tg#alpha}{((#sigma_{z}^{2}-#sigma_{y}^{2})tg#alpha __ #sigma_{z}^{2}}}
934 : // END_LATEX
935 : //
936 : // before applying the tilt rotation we also apply systematic uncertainties to the tracklet
937 : // position which can be tunned from outside via the AliTRDrecoParam::SetSysCovMatrix(). They might
938 : // account for extra misalignment/miscalibration uncertainties.
939 : //
940 : // Author :
941 : // Alex Bercuci <A.Bercuci@gsi.de>
942 : // Date : Jan 8th 2009
943 : //
944 :
945 :
946 : //Double_t xr = fX0-x;
947 1098 : Double_t sy2 = fCov[0];// +2.*xr*fCov[1] + xr*xr*fCov[2];
948 549 : Double_t sz2 = fS2Z;
949 : //GetPadLength()*GetPadLength()/12.;
950 :
951 : // insert systematic uncertainties
952 549 : if(fkReconstructor){
953 549 : Double_t sys[15]; memset(sys, 0, 15*sizeof(Double_t));
954 549 : fkReconstructor->GetRecoParam()->GetSysCovMatrix(sys);
955 : // sy2 += sys[0];
956 : // sz2 += sys[1];
957 549 : }
958 :
959 : // rotate covariance matrix if no RC
960 549 : if(!IsRowCross()){
961 514 : Double_t t2 = GetTilt()*GetTilt();
962 514 : Double_t correction = 1./(1. + t2);
963 514 : cov[0] = (sy2+t2*sz2)*correction;
964 514 : cov[1] = GetTilt()*(sz2 - sy2)*correction;
965 514 : cov[2] = (t2*sy2+sz2)*correction;
966 514 : } else {
967 35 : cov[0] = sy2; cov[1] = 0.; cov[2] = sz2;
968 : }
969 :
970 1647 : AliDebug(4, Form("C(%6.1f %+6.3f %6.1f) RC[%c]", 1.e4*TMath::Sqrt(cov[0]), cov[1], 1.e4*TMath::Sqrt(cov[2]), IsRowCross()?'y':'n'));
971 549 : }
972 :
973 : //____________________________________________________________
974 : Int_t AliTRDseedV1::GetCovSqrt(const Double_t * const c, Double_t *d)
975 : {
976 : // Helper function to calculate the square root of the covariance matrix.
977 : // The input matrix is stored in the vector c and the result in the vector d.
978 : // Both arrays have to be initialized by the user with at least 3 elements. Return negative in case of failure.
979 : //
980 : // For calculating the square root of the symmetric matrix c
981 : // the following relation is used:
982 : // BEGIN_LATEX
983 : // C^{1/2} = VD^{1/2}V^{-1}
984 : // END_LATEX
985 : // with V being the matrix with the n eigenvectors as columns.
986 : // In case C is symmetric the followings are true:
987 : // - matrix D is diagonal with the diagonal given by the eigenvalues of C
988 : // - V = V^{-1}
989 : //
990 : // Author A.Bercuci <A.Bercuci@gsi.de>
991 : // Date Mar 19 2009
992 :
993 : const Double_t kZero(1.e-20);
994 : Double_t l[2], // eigenvalues
995 : v[3]; // eigenvectors
996 : // the secular equation and its solution :
997 : // (c[0]-L)(c[2]-L)-c[1]^2 = 0
998 : // L^2 - L*Tr(c)+DET(c) = 0
999 : // L12 = [Tr(c) +- sqrt(Tr(c)^2-4*DET(c))]/2
1000 0 : Double_t tr = c[0]+c[2], // trace
1001 0 : det = c[0]*c[2]-c[1]*c[1]; // determinant
1002 0 : if(TMath::Abs(det)<kZero) return 1;
1003 0 : Double_t dd = TMath::Sqrt(tr*tr - 4*det);
1004 0 : l[0] = .5*(tr + dd*(c[0]>c[2]?-1.:1.));
1005 0 : l[1] = .5*(tr + dd*(c[0]>c[2]?1.:-1.));
1006 0 : if(l[0]<kZero || l[1]<kZero) return 2;
1007 : // the sym V matrix
1008 : // | v00 v10|
1009 : // | v10 v11|
1010 0 : Double_t den = (l[0]-c[0])*(l[0]-c[0])+c[1]*c[1];
1011 0 : if(den<kZero){ // almost diagonal
1012 0 : v[0] = TMath::Sign(0., c[1]);
1013 0 : v[1] = TMath::Sign(1., (l[0]-c[0]));
1014 0 : v[2] = TMath::Sign(0., c[1]*(l[0]-c[0])*(l[1]-c[2]));
1015 0 : } else {
1016 0 : Double_t tmp = 1./TMath::Sqrt(den);
1017 0 : v[0] = c[1]* tmp;
1018 0 : v[1] = (l[0]-c[0])*tmp;
1019 0 : if(TMath::Abs(l[1]-c[2])<kZero) v[2] = TMath::Sign(v[0]*(l[0]-c[0])/kZero, (l[1]-c[2]));
1020 0 : else v[2] = v[0]*(l[0]-c[0])/(l[1]-c[2]);
1021 : }
1022 : // the VD^{1/2}V is:
1023 0 : l[0] = TMath::Sqrt(l[0]); l[1] = TMath::Sqrt(l[1]);
1024 0 : d[0] = v[0]*v[0]*l[0]+v[1]*v[1]*l[1];
1025 0 : d[1] = v[0]*v[1]*l[0]+v[1]*v[2]*l[1];
1026 0 : d[2] = v[1]*v[1]*l[0]+v[2]*v[2]*l[1];
1027 :
1028 : return 0;
1029 0 : }
1030 :
1031 : //____________________________________________________________
1032 : Double_t AliTRDseedV1::GetCovInv(const Double_t * const c, Double_t *d)
1033 : {
1034 : // Helper function to calculate the inverse of the covariance matrix.
1035 : // The input matrix is stored in the vector c and the result in the vector d.
1036 : // Both arrays have to be initialized by the user with at least 3 elements
1037 : // The return value is the determinant or 0 in case of singularity.
1038 : //
1039 : // Author A.Bercuci <A.Bercuci@gsi.de>
1040 : // Date Mar 19 2009
1041 :
1042 0 : Double_t det = c[0]*c[2] - c[1]*c[1];
1043 0 : if(TMath::Abs(det)<1.e-20) return 0.;
1044 0 : Double_t invDet = 1./det;
1045 0 : d[0] = c[2]*invDet;
1046 0 : d[1] =-c[1]*invDet;
1047 0 : d[2] = c[0]*invDet;
1048 : return det;
1049 0 : }
1050 :
1051 : //____________________________________________________________________
1052 : UShort_t AliTRDseedV1::GetVolumeId() const
1053 : {
1054 : // Returns geometry volume id by delegation
1055 :
1056 1410 : for(Int_t ic(0);ic<kNclusters; ic++){
1057 808 : if(fClusters[ic]) return fClusters[ic]->GetVolumeId();
1058 : }
1059 0 : return 0;
1060 206 : }
1061 :
1062 :
1063 : //____________________________________________________________________
1064 : void AliTRDseedV1::Calibrate()
1065 : {
1066 : // Retrieve calibration and position parameters from OCDB.
1067 : // The following information are used
1068 : // - detector index
1069 : // - column and row position of first attached cluster. If no clusters are attached
1070 : // to the tracklet a random central chamber position (c=70, r=7) will be used.
1071 : //
1072 : // The following information is cached in the tracklet
1073 : // t0 (trigger delay)
1074 : // drift velocity
1075 : // PRF width
1076 : // omega*tau = tg(a_L)
1077 : // diffusion coefficients (longitudinal and transversal)
1078 : //
1079 : // Author :
1080 : // Alex Bercuci <A.Bercuci@gsi.de>
1081 : // Date : Jan 8th 2009
1082 : //
1083 :
1084 524 : AliCDBManager *cdb = AliCDBManager::Instance();
1085 262 : if(cdb->GetRun() < 0){
1086 0 : AliError("OCDB manager not properly initialized");
1087 0 : return;
1088 : }
1089 :
1090 262 : AliTRDcalibDB *calib = AliTRDcalibDB::Instance();
1091 262 : AliTRDCalROC *vdROC = calib->GetVdriftROC(fDet),
1092 262 : *t0ROC = calib->GetT0ROC(fDet);;
1093 262 : const AliTRDCalDet *vdDet = calib->GetVdriftDet();
1094 262 : const AliTRDCalDet *t0Det = calib->GetT0Det();
1095 :
1096 : Int_t col = 70, row = 7;
1097 262 : AliTRDcluster **c = &fClusters[0];
1098 262 : if(GetN()){
1099 : Int_t ic = 0;
1100 0 : while (ic<kNclusters && !(*c)){ic++; c++;}
1101 0 : if(*c){
1102 0 : col = (*c)->GetPadCol();
1103 0 : row = (*c)->GetPadRow();
1104 0 : }
1105 0 : }
1106 :
1107 262 : fT0 = (t0Det->GetValue(fDet) + t0ROC->GetValue(col,row)) / AliTRDCommonParam::Instance()->GetSamplingFrequency();
1108 262 : fVD = vdDet->GetValue(fDet) * vdROC->GetValue(col, row);
1109 262 : fS2PRF = calib->GetPRFWidth(fDet, col, row); fS2PRF *= fS2PRF;
1110 262 : fExB = AliTRDCommonParam::Instance()->GetOmegaTau(fVD);
1111 524 : AliTRDCommonParam::Instance()->GetDiffCoeff(fDiffL,
1112 262 : fDiffT, fVD);
1113 786 : AliDebug(4, Form("Calibration params for Det[%3d] Col[%3d] Row[%2d]\n t0[%f] vd[%f] s2PRF[%f] ExB[%f] Dl[%f] Dt[%f]", fDet, col, row, fT0, fVD, fS2PRF, fExB, fDiffL, fDiffT));
1114 :
1115 :
1116 262 : SetBit(kCalib, kTRUE);
1117 524 : }
1118 :
1119 : //____________________________________________________________________
1120 : void AliTRDseedV1::SetOwner()
1121 : {
1122 : //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO"));
1123 :
1124 412 : if(TestBit(kOwner)) return;
1125 25956 : for(int ic=0; ic<kNclusters; ic++){
1126 12772 : if(!fClusters[ic]) continue;
1127 8960 : fClusters[ic] = new AliTRDcluster(*fClusters[ic]);
1128 4480 : }
1129 206 : SetBit(kOwner);
1130 412 : }
1131 :
1132 : //____________________________________________________________
1133 : void AliTRDseedV1::SetPadPlane(AliTRDpadPlane * const p)
1134 : {
1135 : // Shortcut method to initialize pad geometry.
1136 524 : fPad[0] = p->GetLengthIPad();
1137 262 : fPad[1] = p->GetWidthIPad();
1138 262 : fPad[2] = TMath::Tan(TMath::DegToRad()*p->GetTiltingAngle());
1139 262 : fPad[3] = p->GetRow0() + p->GetAnodeWireOffset();
1140 262 : }
1141 :
1142 :
1143 :
1144 : //____________________________________________________________________
1145 : Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *const chamber, Bool_t tilt, Bool_t chgPos, Int_t ev)
1146 : {
1147 : //
1148 : // Projective algorithm to attach clusters to seeding tracklets. The following steps are performed :
1149 : // 1. Collapse x coordinate for the full detector plane
1150 : // 2. truncated mean on y (r-phi) direction
1151 : // 3. purge clusters
1152 : // 4. truncated mean on z direction
1153 : // 5. purge clusters
1154 : //
1155 : // Parameters
1156 : // - chamber : pointer to tracking chamber container used to search the tracklet
1157 : // - tilt : switch for tilt correction during road building [default true]
1158 : // - chgPos : mark same[kFALSE] and opposite[kTRUE] sign tracks with respect to Bz field sign [default true]
1159 : // - ev : event number for debug purposes [default = -1]
1160 : // Output
1161 : // - true : if tracklet found successfully. Failure can happend because of the following:
1162 : // -
1163 : // Detailed description
1164 : //
1165 : // We start up by defining the track direction in the xy plane and roads. The roads are calculated based
1166 : // on tracking information (variance in the r-phi direction) and estimated variance of the standard
1167 : // clusters (see AliTRDcluster::SetSigmaY2()) corrected for tilt (see GetCovAt()). From this the road is
1168 : // BEGIN_LATEX
1169 : // r_{y} = 3*#sqrt{12*(#sigma^{2}_{Trk}(y) + #frac{#sigma^{2}_{cl}(y) + tg^{2}(#alpha_{L})#sigma^{2}_{cl}(z)}{1+tg^{2}(#alpha_{L})})}
1170 : // r_{z} = 1.5*L_{pad}
1171 : // END_LATEX
1172 : //
1173 : // Author : Alexandru Bercuci <A.Bercuci@gsi.de>
1174 : // Debug : level = 2 for calibration
1175 : // level = 3 for visualization in the track SR
1176 : // level = 4 for full visualization including digit level
1177 :
1178 262 : const AliTRDrecoParam* const recoParam = fkReconstructor->GetRecoParam(); //the dynamic cast in GetRecoParam is slow, so caching the pointer to it
1179 :
1180 : //RS define max cl. per layer to search
1181 : const int kMaxClFindPerLayer = 6;
1182 262 : int maxClFind = kMaxClFindPerLayer + AliTRDReconstructor::GetExtraMaxClPerLayer();
1183 :
1184 : //RS define roads with optional extension
1185 : const Double_t kroady = 3.; //recoParam->GetRoad1y();
1186 262 : const Double_t kroadz = GetPadLength() * recoParam->GetRoadzMultiplicator() + 1.;
1187 262 : double extraRoadY = AliTRDReconstructor::GetExtraRoadY();
1188 262 : double extraRoadZ = AliTRDReconstructor::GetExtraRoadZ();
1189 :
1190 262 : if(!recoParam){
1191 0 : AliError("Tracklets can not be used without a valid RecoParam.");
1192 0 : return kFALSE;
1193 : }
1194 262 : AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
1195 262 : if (!calibration) {
1196 0 : AliError("No access to calibration data");
1197 0 : return kFALSE;
1198 : }
1199 : // Retrieve the CDB container class with the parametric likelihood
1200 262 : const AliTRDCalTrkAttach *attach = calibration->GetAttachObject();
1201 262 : if (!attach) {
1202 0 : AliError("No usable AttachClusters calib object.");
1203 0 : return kFALSE;
1204 : }
1205 :
1206 : // Initialize reco params for this tracklet
1207 : // 1. first time bin in the drift region
1208 : Int_t t0 = 14;
1209 262 : Int_t kClmin = Int_t(recoParam->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins());
1210 : Int_t kTBmin = 4;
1211 :
1212 262 : Double_t sysCov[5]; recoParam->GetSysCovMatrix(sysCov);
1213 262 : Double_t s2yTrk= fRefCov[0],
1214 : s2yCl = 0.,
1215 262 : s2zCl = GetPadLength()*GetPadLength()/12.,
1216 262 : syRef = TMath::Sqrt(s2yTrk),
1217 262 : t2 = GetTilt()*GetTilt();
1218 : // define probing cluster (the perfect cluster) and default calibration
1219 262 : Short_t sig[] = {0, 0, 10, 30, 10, 0,0};
1220 262 : AliTRDcluster cp(fDet, 6, 75, 0, sig, 0);
1221 262 : if(fkReconstructor->IsHLT()) cp.SetRPhiMethod(AliTRDcluster::kCOG);
1222 524 : if(!IsCalibrated()) Calibrate();
1223 :
1224 : /* Int_t kroadyShift(0);
1225 : Float_t bz(AliTrackerBase::GetBz());
1226 : if(TMath::Abs(bz)>2.){
1227 : if(bz<0.) kroadyShift = chgPos ? +1 : -1;
1228 : else kroadyShift = chgPos ? -1 : +1;
1229 : }*/
1230 1310 : AliDebug(4, Form("\n syTrk[cm]=%4.2f dydxTrk[deg]=%+6.2f Chg[%c] rY[cm]=%4.2f rZ[cm]=%5.2f TC[%c]", syRef, TMath::ATan(fYref[1])*TMath::RadToDeg(), chgPos?'+':'-', kroady, kroadz, tilt?'y':'n'));
1231 262 : Double_t phiTrk(TMath::ATan(fYref[1])),
1232 262 : thtTrk(TMath::ATan(fZref[1]));
1233 :
1234 : // working variables
1235 : const Int_t kNrows = 16;
1236 : const Int_t kNcls = 3*kNclusters; // buffer size
1237 8646 : TObjArray clst[kNrows];
1238 262 : Bool_t blst[kNrows][kNcls];
1239 262 : Double_t cond[4],
1240 : dx, dy, dz,
1241 : yt, zt,
1242 : zc[kNrows],
1243 : xres[kNrows][kNcls], yres[kNrows][kNcls], zres[kNrows][kNcls], s2y[kNrows][kNcls];
1244 262 : Int_t idxs[kNrows][kNcls], ncl[kNrows], ncls = 0;
1245 262 : memset(ncl, 0, kNrows*sizeof(Int_t));
1246 262 : memset(zc, 0, kNrows*sizeof(Double_t));
1247 262 : memset(idxs, 0, kNrows*kNcls*sizeof(Int_t));
1248 262 : memset(xres, 0, kNrows*kNcls*sizeof(Double_t));
1249 262 : memset(yres, 0, kNrows*kNcls*sizeof(Double_t));
1250 262 : memset(zres, 0, kNrows*kNcls*sizeof(Double_t));
1251 262 : memset(s2y, 0, kNrows*kNcls*sizeof(Double_t));
1252 262 : memset(blst, 0, kNrows*kNcls*sizeof(Bool_t)); //this is 8 times faster to memset than "memset(clst, 0, kNrows*kNcls*sizeof(AliTRDcluster*))"
1253 :
1254 262 : Double_t roady(0.), s2Mean(0.); Int_t ns2Mean(0);
1255 :
1256 : // Do cluster projection and pick up cluster candidates
1257 : AliTRDcluster *c(NULL);
1258 : AliTRDchamberTimeBin *layer(NULL);
1259 : Bool_t kBUFFER = kFALSE;
1260 17030 : for (Int_t it = 0; it < kNtb; it++) {
1261 8122 : if(!(layer = chamber->GetTB(it))) continue;
1262 8122 : if(!Int_t(*layer)) continue;
1263 : // get track projection at layers position
1264 5895 : dx = fX0 - layer->GetX();
1265 5895 : yt = fYref[0] - fYref[1] * dx;
1266 5895 : zt = fZref[0] - fZref[1] * dx;
1267 : // get standard cluster error corrected for tilt if selected
1268 5895 : cp.SetLocalTimeBin(it);
1269 5895 : cp.SetSigmaY2(0.02, fDiffT, fExB, dx, -1./*zt*/, fYref[1]);
1270 5895 : s2yCl = cp.GetSigmaY2() + sysCov[0]; if(!tilt) s2yCl = (s2yCl + t2*s2zCl)/(1.+t2);
1271 9117 : if(TMath::Abs(it-12)<7){ s2Mean += cp.GetSigmaY2(); ns2Mean++;}
1272 : // get estimated road in r-phi direction
1273 5895 : if (extraRoadY>0) roady = kroady + extraRoadY;
1274 5895 : else roady = TMath::Min(3.*TMath::Sqrt(12.*(s2yTrk + s2yCl)), kroady);
1275 29475 : AliDebug(5, Form("\n"
1276 : " %2d xd[cm]=%6.3f yt[cm]=%7.2f zt[cm]=%8.2f\n"
1277 : " syTrk[um]=%6.2f syCl[um]=%6.2f syClTlt[um]=%6.2f\n"
1278 : " Ry[mm]=%f"
1279 : , it, dx, yt, zt
1280 : , 1.e4*TMath::Sqrt(s2yTrk), 1.e4*TMath::Sqrt(cp.GetSigmaY2()+sysCov[0]), 1.e4*TMath::Sqrt(s2yCl)
1281 : , 1.e1*roady));
1282 :
1283 : // get clusters from layer
1284 5895 : cond[0] = yt/*+0.5*kroadyShift*kroady*/; cond[2] = roady;
1285 5895 : cond[1] = zt; cond[3] = kroadz + extraRoadZ;
1286 5895 : Int_t n=0, idx[maxClFind]; layer->GetClusters(cond, idx, n, maxClFind);
1287 23172 : for(Int_t ic = n; ic--;){
1288 5487 : c = (*layer)[idx[ic]];
1289 5487 : dx = fX0 - c->GetX();
1290 5487 : yt = fYref[0] - fYref[1] * dx;
1291 5487 : zt = fZref[0] - fZref[1] * dx;
1292 5487 : dz = zt - c->GetZ();
1293 16461 : dy = yt - (c->GetY() + (tilt ? (GetTilt() * dz) : 0.));
1294 5487 : Int_t r = c->GetPadRow();
1295 5487 : clst[r].AddAtAndExpand(c, ncl[r]);
1296 5487 : blst[r][ncl[r]] = kTRUE;
1297 5487 : idxs[r][ncl[r]] = idx[ic];
1298 5487 : zres[r][ncl[r]] = dz/GetPadLength();
1299 5487 : yres[r][ncl[r]] = dy;
1300 5487 : xres[r][ncl[r]] = dx;
1301 5487 : zc[r] = c->GetZ();
1302 : // TODO temporary solution to avoid divercences in error parametrization
1303 5487 : s2y[r][ncl[r]] = TMath::Min(c->GetSigmaY2()+sysCov[0], 0.025);
1304 27435 : AliDebug(5, Form(" -> dy[cm]=%+7.4f yc[cm]=%7.2f row[%d] idx[%2d]", dy, c->GetY(), r, ncl[r]));
1305 5487 : ncl[r]++; ncls++;
1306 :
1307 5487 : if(ncl[r] >= kNcls) {
1308 0 : AliWarning(Form("Cluster candidates row[%d] reached buffer limit[%d]. Some may be lost.", r, kNcls));
1309 : kBUFFER = kTRUE;
1310 0 : break;
1311 : }
1312 5487 : }
1313 5895 : if(kBUFFER) break;
1314 11790 : }
1315 262 : if(ncls<kClmin){
1316 160 : AliDebug(1, Form("CLUSTERS FOUND %d LESS THAN THRESHOLD %d.", ncls, kClmin));
1317 32 : SetErrorMsg(kAttachClFound);
1318 1088 : for(Int_t ir(kNrows);ir--;) clst[ir].Clear();
1319 32 : return kFALSE;
1320 : }
1321 230 : if(ns2Mean<kTBmin){
1322 0 : AliDebug(1, Form("CLUSTERS IN TimeBins %d LESS THAN THRESHOLD %d.", ns2Mean, kTBmin));
1323 0 : SetErrorMsg(kAttachClFound);
1324 0 : for(Int_t ir(kNrows);ir--;) clst[ir].Clear();
1325 0 : return kFALSE;
1326 : }
1327 230 : s2Mean /= ns2Mean; //sMean = TMath::Sqrt(s2Mean);
1328 : //Double_t sRef(TMath::Sqrt(s2Mean+s2yTrk)); // reference error parameterization
1329 :
1330 : // organize row candidates
1331 230 : Int_t idxRow[kNrows], nrc(0); Double_t zresRow[kNrows];
1332 7820 : for(Int_t ir(0); ir<kNrows; ir++){
1333 3680 : idxRow[ir]=-1; zresRow[ir] = 999.;
1334 3680 : if(!ncl[ir]) continue;
1335 : // get mean z resolution
1336 11745 : dz = 0.; for(Int_t ic = ncl[ir]; ic--;) dz += zres[ir][ic]; dz/=ncl[ir];
1337 : // insert row
1338 265 : idxRow[nrc] = ir; zresRow[nrc] = TMath::Abs(dz); nrc++;
1339 265 : }
1340 1150 : AliDebug(4, Form("Found %d clusters in %d rows. Sorting ...", ncls, nrc));
1341 :
1342 : // sort row candidates
1343 230 : if(nrc>=2){
1344 33 : if(nrc==2){
1345 31 : if(zresRow[0]>zresRow[1]){ // swap
1346 14 : Int_t itmp=idxRow[1]; idxRow[1] = idxRow[0]; idxRow[0] = itmp;
1347 14 : Double_t dtmp=zresRow[1]; zresRow[1] = zresRow[0]; zresRow[0] = dtmp;
1348 14 : }
1349 31 : if(TMath::Abs(idxRow[1] - idxRow[0]) != 1){
1350 0 : SetErrorMsg(kAttachRowGap);
1351 0 : AliDebug(2, Form("Rows attached not continuous. Select first candidate.\n"
1352 : " row[%2d] Ncl[%2d] <dz>[cm]=%+8.2f row[%2d] Ncl[%2d] <dz>[cm]=%+8.2f",
1353 : idxRow[0], ncl[idxRow[0]], zresRow[0], idxRow[1], idxRow[1]<0?0:ncl[idxRow[1]], zresRow[1]));
1354 0 : nrc=1; idxRow[1] = -1; zresRow[1] = 999.;
1355 0 : }
1356 : } else {
1357 2 : Int_t idx0[kNrows];
1358 2 : TMath::Sort(nrc, zresRow, idx0, kFALSE);
1359 : nrc = 3; // select only maximum first 3 candidates
1360 2 : Int_t iatmp[] = {-1, -1, -1}; Double_t datmp[] = {999., 999., 999.};
1361 16 : for(Int_t irc(0); irc<nrc; irc++){
1362 6 : iatmp[irc] = idxRow[idx0[irc]];
1363 6 : datmp[irc] = zresRow[idx0[irc]];
1364 : }
1365 2 : idxRow[0] = iatmp[0]; zresRow[0] = datmp[0];
1366 2 : idxRow[1] = iatmp[1]; zresRow[1] = datmp[1];
1367 2 : idxRow[2] = iatmp[2]; zresRow[2] = datmp[2]; // temporary
1368 2 : if(TMath::Abs(idxRow[1] - idxRow[0]) != 1){
1369 0 : SetErrorMsg(kAttachRowGap);
1370 0 : AliDebug(2, Form("Rows attached not continuous. Turn on selection.\n"
1371 : "row[%2d] Ncl[%2d] <dz>[cm]=%+8.2f\n"
1372 : "row[%2d] Ncl[%2d] <dz>[cm]=%+8.2f\n"
1373 : "row[%2d] Ncl[%2d] <dz>[cm]=%+8.2f",
1374 : idxRow[0], ncl[idxRow[0]], zresRow[0],
1375 : idxRow[1], ncl[idxRow[1]], zresRow[1],
1376 : idxRow[2], ncl[idxRow[2]], zresRow[2]));
1377 0 : if(TMath::Abs(idxRow[0] - idxRow[2]) == 1){ // select second candidate
1378 0 : AliDebug(2, "Solved ! Remove second candidate.");
1379 : nrc = 2;
1380 0 : idxRow[1] = idxRow[2]; zresRow[1] = zresRow[2]; // swap
1381 0 : idxRow[2] = -1; zresRow[2] = 999.; // remove
1382 0 : } else if(TMath::Abs(idxRow[1] - idxRow[2]) == 1){
1383 0 : if(ncl[idxRow[1]]+ncl[idxRow[2]] > ncl[idxRow[0]]){
1384 0 : AliDebug(2, "Solved ! Remove first candidate.");
1385 : nrc = 2;
1386 0 : idxRow[0] = idxRow[1]; zresRow[0] = zresRow[1]; // swap
1387 0 : idxRow[1] = idxRow[2]; zresRow[1] = zresRow[2]; // swap
1388 0 : } else {
1389 0 : AliDebug(2, "Solved ! Remove second and third candidate.");
1390 : nrc = 1;
1391 0 : idxRow[1] = -1; zresRow[1] = 999.; // remove
1392 0 : idxRow[2] = -1; zresRow[2] = 999.; // remove
1393 : }
1394 : } else {
1395 0 : AliDebug(2, "Unsolved !!! Remove second and third candidate.");
1396 : nrc = 1;
1397 0 : idxRow[1] = -1; zresRow[1] = 999.; // remove
1398 0 : idxRow[2] = -1; zresRow[2] = 999.; // remove
1399 : }
1400 : } else { // remove temporary candidate
1401 : nrc = 2;
1402 2 : idxRow[2] = -1; zresRow[2] = 999.;
1403 : }
1404 2 : }
1405 : }
1406 1150 : AliDebug(4, Form("Sorted row candidates:\n"
1407 : " row[%2d] Ncl[%2d] <dz>[cm]=%+8.2f row[%2d] Ncl[%2d] <dz>[cm]=%+8.2f"
1408 : , idxRow[0], ncl[idxRow[0]], zresRow[0], idxRow[1], idxRow[1]<0?0:ncl[idxRow[1]], zresRow[1]));
1409 :
1410 : // initialize debug streamer
1411 : TTreeSRedirector *pstreamer(NULL);
1412 460 : if((recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 3 && fkReconstructor->IsDebugStreaming())||
1413 230 : AliTRDReconstructor::GetStreamLevel()>30) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
1414 230 : if(pstreamer){
1415 : // save config. for calibration
1416 0 : TVectorD vdy[2], vdx[2], vs2[2];
1417 0 : for(Int_t jr(0); jr<nrc; jr++){
1418 0 : Int_t ir(idxRow[jr]);
1419 0 : vdx[jr].ResizeTo(ncl[ir]); vdy[jr].ResizeTo(ncl[ir]); vs2[jr].ResizeTo(ncl[ir]);
1420 0 : for(Int_t ic(ncl[ir]); ic--;){
1421 0 : vdx[jr](ic) = xres[ir][ic];
1422 0 : vdy[jr](ic) = yres[ir][ic];
1423 0 : vs2[jr](ic) = s2y[ir][ic];
1424 : }
1425 : }
1426 0 : (*pstreamer) << "AttachClusters4"
1427 0 : << "r0=" << idxRow[0]
1428 0 : << "dz0=" << zresRow[0]
1429 0 : << "dx0=" << &vdx[0]
1430 0 : << "dy0=" << &vdy[0]
1431 0 : << "s20=" << &vs2[0]
1432 0 : << "r1=" << idxRow[1]
1433 0 : << "dz1=" << zresRow[1]
1434 0 : << "dx1=" << &vdx[1]
1435 0 : << "dy1=" << &vdy[1]
1436 0 : << "s21=" << &vs2[1]
1437 0 : << "\n";
1438 0 : vdx[0].Clear(); vdy[0].Clear(); vs2[0].Clear();
1439 0 : vdx[1].Clear(); vdy[1].Clear(); vs2[1].Clear();
1440 0 : if(recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 4 ||AliTRDReconstructor::GetStreamLevel()>4){
1441 0 : Int_t idx(idxRow[1]);
1442 0 : if(idx<0){
1443 0 : for(Int_t ir(0); ir<kNrows; ir++){
1444 0 : if(clst[ir].GetEntries()>0) continue;
1445 : idx = ir;
1446 0 : break;
1447 : }
1448 0 : }
1449 0 : (*pstreamer) << "AttachClusters5"
1450 0 : << "c0.=" << &clst[idxRow[0]]
1451 0 : << "c1.=" << &clst[idx]
1452 0 : << "\n";
1453 0 : }
1454 0 : }
1455 :
1456 : //=======================================================================================
1457 : // Analyse cluster topology
1458 230 : Double_t f[kNcls], // likelihood factors for segments
1459 : r[2][kNcls], // d(dydx) of tracklet candidate with respect to track
1460 : xm[2][kNcls], // mean <x>
1461 : ym[2][kNcls], // mean <y>
1462 : sm[2][kNcls], // mean <s_y>
1463 : s[2][kNcls], // sigma_y
1464 : p[2][kNcls], // prob of Gauss
1465 : q[2][kNcls]; // charge/segment
1466 230 : memset(f, 0, kNcls*sizeof(Double_t));
1467 230 : Int_t index[2][kNcls], n[2][kNcls];
1468 230 : memset(n, 0, 2*kNcls*sizeof(Int_t));
1469 230 : Int_t mts(0), nts[2] = {0, 0}; // no of tracklet segments in row
1470 460 : AliTRDpadPlane *pp(AliTRDtransform::Geometry().GetPadPlane(fDet));
1471 230 : AliTRDtrackletOflHelper helper;
1472 230 : Int_t lyDet(AliTRDgeometry::GetLayer(fDet));
1473 986 : for(Int_t jr(0), n0(0); jr<nrc; jr++){
1474 263 : Int_t ir(idxRow[jr]);
1475 : // cluster segmentation
1476 : Bool_t kInit(kFALSE);
1477 263 : if(jr==0){
1478 230 : n0 = helper.Init(pp, &clst[ir]); kInit = kTRUE;
1479 690 : if(!n0 || (helper.ClassifyTopology() == AliTRDtrackletOflHelper::kNormal)){
1480 216 : nts[jr] = 1; memset(index[jr], 0, ncl[ir]*sizeof(Int_t));
1481 216 : n[jr][0] = ncl[ir];
1482 216 : }
1483 : }
1484 263 : if(!n[jr][0]){
1485 94 : nts[jr] = AliTRDtrackletOflHelper::Segmentation(ncl[ir], xres[ir], yres[ir], index[jr]);
1486 1978 : for(Int_t ic(ncl[ir]);ic--;) n[jr][index[jr][ic]]++;
1487 47 : }
1488 263 : mts += nts[jr];
1489 :
1490 : // tracklet segment processing
1491 1148 : for(Int_t its(0); its<nts[jr]; its++){
1492 311 : if(n[jr][its]<=2) { // don't touch small segments
1493 20 : xm[jr][its] = 0.;ym[jr][its] = 0.;sm[jr][its] = 0.;
1494 816 : for(Int_t ic(ncl[ir]); ic--;){
1495 752 : if(its != index[jr][ic]) continue;
1496 24 : ym[jr][its] += yres[ir][ic];
1497 24 : xm[jr][its] += xres[ir][ic];
1498 24 : sm[jr][its] += TMath::Sqrt(s2y[ir][ic]);
1499 : }
1500 24 : if(n[jr][its]==2){ xm[jr][its] *= 0.5; ym[jr][its] *= 0.5; sm[jr][its] *= 0.5;}
1501 20 : xm[jr][its]= fX0 - xm[jr][its];
1502 20 : r[jr][its] = 0.;
1503 20 : s[jr][its] = 1.e-5;
1504 20 : p[jr][its] = 1.;
1505 20 : q[jr][its] = -1.;
1506 20 : continue;
1507 : }
1508 :
1509 : // for longer tracklet segments
1510 369 : if(!kInit) n0 = helper.Init(pp, &clst[ir], index[jr], its);
1511 291 : Int_t n1 = helper.GetRMS(r[jr][its], ym[jr][its], s[jr][its], fX0/*xm[jr][its]*/);
1512 291 : p[jr][its] = Double_t(n1)/n0;
1513 582 : sm[jr][its] = helper.GetSyMean();
1514 582 : q[jr][its] = helper.GetQ()/TMath::Sqrt(1. + fYref[1]*fYref[1] + fZref[1]*fZref[1]);
1515 291 : xm[jr][its] = fX0;
1516 291 : Double_t dxm= fX0 - xm[jr][its];
1517 291 : yt = fYref[0] - fYref[1]*dxm;
1518 291 : zt = fZref[0] - fZref[1]*dxm;
1519 : // correct tracklet fit for tilt
1520 291 : ym[jr][its]+= GetTilt()*(zt - zc[ir]);
1521 291 : r[jr][its] += GetTilt() * fZref[1];
1522 : // correct tracklet fit for track position/inclination
1523 291 : ym[jr][its] = yt - ym[jr][its];
1524 291 : r[jr][its] = (r[jr][its] - fYref[1])/(1+r[jr][its]*fYref[1]);
1525 : // report inclination in radians
1526 291 : r[jr][its] = TMath::ATan(r[jr][its]);
1527 330 : if(jr) continue; // calculate only for first row likelihoods
1528 :
1529 504 : f[its] = attach->CookLikelihood(chgPos, lyDet, fPt, phiTrk, n[jr][its], ym[jr][its]/*sRef*/, r[jr][its]*TMath::RadToDeg(), s[jr][its]/sm[jr][its]);
1530 252 : }
1531 : }
1532 1150 : AliDebug(4, Form(" Tracklet candidates: row[%2d] = %2d row[%2d] = %2d:", idxRow[0], nts[0], idxRow[1], nts[1]));
1533 460 : if(AliLog::GetDebugLevel("TRD", "AliTRDseedV1")>3){
1534 0 : for(Int_t jr(0); jr<nrc; jr++){
1535 0 : Int_t ir(idxRow[jr]);
1536 0 : for(Int_t its(0); its<nts[jr]; its++){
1537 0 : printf(" segId[%2d] row[%2d] Ncl[%2d] x[cm]=%7.2f dz[pu]=%4.2f dy[mm]=%+7.3f r[deg]=%+6.2f p[%%]=%6.2f s[um]=%7.2f\n",
1538 0 : its, ir, n[jr][its], xm[jr][its], zresRow[jr], 1.e1*ym[jr][its], r[jr][its]*TMath::RadToDeg(), 100.*p[jr][its], 1.e4*s[jr][its]);
1539 : }
1540 : }
1541 0 : }
1542 460 : if(!pstreamer &&
1543 230 : ( (recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 2 && fkReconstructor->IsDebugStreaming()) ||
1544 230 : AliTRDReconstructor::GetStreamLevel()>2 )
1545 0 : ) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
1546 230 : if(pstreamer){
1547 : // save config. for calibration
1548 0 : TVectorD vidx, vn, vx, vy, vr, vs, vsm, vp, vf;
1549 0 : vidx.ResizeTo(ncl[idxRow[0]]+(idxRow[1]<0?0:ncl[idxRow[1]]));
1550 0 : vn.ResizeTo(mts);
1551 0 : vx.ResizeTo(mts);
1552 0 : vy.ResizeTo(mts);
1553 0 : vr.ResizeTo(mts);
1554 0 : vs.ResizeTo(mts);
1555 0 : vsm.ResizeTo(mts);
1556 0 : vp.ResizeTo(mts);
1557 0 : vf.ResizeTo(mts);
1558 0 : for(Int_t jr(0), jts(0), jc(0); jr<nrc; jr++){
1559 0 : Int_t ir(idxRow[jr]);
1560 0 : for(Int_t its(0); its<nts[jr]; its++, jts++){
1561 0 : vn[jts] = n[jr][its];
1562 0 : vx[jts] = xm[jr][its];
1563 0 : vy[jts] = ym[jr][its];
1564 0 : vr[jts] = r[jr][its];
1565 0 : vs[jts] = s[jr][its];
1566 0 : vsm[jts]= sm[jr][its];
1567 0 : vp[jts] = p[jr][its];
1568 0 : vf[jts] = jr?-1.:f[its];
1569 : }
1570 0 : for(Int_t ic(0); ic<ncl[ir]; ic++, jc++) vidx[jc] = index[jr][ic];
1571 : }
1572 0 : (*pstreamer) << "AttachClusters3"
1573 0 : << "idx=" << &vidx
1574 0 : << "n=" << &vn
1575 0 : << "x=" << &vx
1576 0 : << "y=" << &vy
1577 0 : << "r=" << &vr
1578 0 : << "s=" << &vs
1579 0 : << "sm=" << &vsm
1580 0 : << "p=" << &vp
1581 0 : << "f=" << &vf
1582 0 : << "\n";
1583 0 : }
1584 :
1585 : //=========================================================
1586 : // Get seed tracklet segment
1587 230 : Int_t idx2[kNcls]; memset(idx2, 0, kNcls*sizeof(Int_t)); // seeding indexing
1588 244 : if(nts[0]>1) TMath::Sort(nts[0], f, idx2);
1589 230 : Int_t is(idx2[0]); // seed index
1590 230 : Int_t idxTrklt[kNcls],
1591 : kts(0),
1592 230 : nTrklt(n[0][is]);
1593 1610 : Double_t fTrklt(f[is]),
1594 230 : rTrklt(r[0][is]),
1595 230 : yTrklt(ym[0][is]),
1596 230 : sTrklt(s[0][is]),
1597 230 : smTrklt(sm[0][is]),
1598 230 : xTrklt(xm[0][is]),
1599 230 : pTrklt(p[0][is]),
1600 230 : qTrklt(q[0][is]);
1601 230 : memset(idxTrklt, 0, kNcls*sizeof(Int_t));
1602 : // check seed idx2[0] exit if not found
1603 460 : if(f[is]<1.e-2){
1604 240 : AliDebug(1, Form("Seed seg[%d] row[%2d] n[%2d] f[%f]<0.01.", is, idxRow[0], n[0][is], f[is]));
1605 2 : SetErrorMsg(kAttachClAttach);
1606 4 : if(!pstreamer &&
1607 2 : ( (recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()) ||
1608 2 : AliTRDReconstructor::GetStreamLevel()>1 )
1609 0 : ) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
1610 2 : if(pstreamer){
1611 0 : UChar_t stat(0);
1612 0 : if(IsKink()) SETBIT(stat, 1);
1613 0 : if(IsStandAlone()) SETBIT(stat, 2);
1614 0 : if(IsRowCross()) SETBIT(stat, 3);
1615 0 : SETBIT(stat, 4); // set error bit
1616 0 : TVectorD vidx; vidx.ResizeTo(1); vidx[0] = is;
1617 0 : (*pstreamer) << "AttachClusters2"
1618 0 : << "stat=" << stat
1619 0 : << "ev=" << ev
1620 0 : << "chg=" << chgPos
1621 0 : << "det=" << fDet
1622 0 : << "x0=" << fX0
1623 0 : << "y0=" << fYref[0]
1624 0 : << "z0=" << fZref[0]
1625 0 : << "phi=" << phiTrk
1626 0 : << "tht=" << thtTrk
1627 0 : << "pt=" << fPt
1628 0 : << "s2Trk=" << s2yTrk
1629 0 : << "s2Cl=" << s2Mean
1630 0 : << "idx=" << &vidx
1631 0 : << "n=" << nTrklt
1632 0 : << "f=" << fTrklt
1633 0 : << "x=" << xTrklt
1634 0 : << "y=" << yTrklt
1635 0 : << "r=" << rTrklt
1636 0 : << "s=" << sTrklt
1637 0 : << "sm=" << smTrklt
1638 0 : << "p=" << pTrklt
1639 0 : << "q=" << qTrklt
1640 0 : << "\n";
1641 0 : }
1642 2 : return kFALSE;
1643 : }
1644 1140 : AliDebug(2, Form("Seed seg[%d] row[%2d] n[%2d] dy[%f] r[%+5.2f] s[%+5.2f] f[%5.3f] q[%6.2f]", is, idxRow[0], n[0][is], ym[0][is], r[0][is]*TMath::RadToDeg(), s[0][is]/sm[0][is], f[is], q[0][is]));
1645 :
1646 : // save seeding segment in the helper
1647 228 : idxTrklt[kts++] = is;
1648 228 : helper.Init(pp, &clst[idxRow[0]], index[0], is);
1649 228 : AliTRDtrackletOflHelper test; // helper to test segment expantion
1650 228 : Float_t rcLikelihood(0.); SetBit(kRowCross, kFALSE);
1651 228 : Double_t dyRez[kNcls]; Int_t idx3[kNcls];
1652 :
1653 : //=========================================================
1654 : // Define filter parameters from OCDB
1655 228 : Int_t kNSgmDy[2]; attach->GetNsgmDy(kNSgmDy[0], kNSgmDy[1]);
1656 228 : Float_t kLikeMinRelDecrease[2]; attach->GetLikeMinRelDecrease(kLikeMinRelDecrease[0], kLikeMinRelDecrease[1]);
1657 228 : Float_t kRClikeLimit(attach->GetRClikeLimit());
1658 :
1659 : //=========================================================
1660 : // Try attaching next segments from first row (if any)
1661 228 : if(nts[0]>1){
1662 14 : Int_t jr(0), ir(idxRow[jr]);
1663 : // organize secondary sgms. in decreasing order of their distance from seed
1664 14 : memset(dyRez, 0, nts[jr]*sizeof(Double_t));
1665 108 : for(Int_t jts(1); jts<nts[jr]; jts++) {
1666 40 : Int_t its(idx2[jts]);
1667 40 : Double_t rot(TMath::Tan(r[0][is]));
1668 40 : dyRez[its] = TMath::Abs(ym[0][is] - ym[jr][its] + rot*(xm[0][is]-xm[jr][its]));
1669 : }
1670 14 : TMath::Sort(nts[jr], dyRez, idx3, kFALSE);
1671 108 : for (Int_t jts(1); jts<nts[jr]; jts++) {
1672 40 : Int_t its(idx3[jts]);
1673 40 : if(dyRez[its] > kNSgmDy[jr]*smTrklt){
1674 80 : AliDebug(2, Form("Reject seg[%d] row[%2d] n[%2d] dy[%f] > %d*s[%f].", its, idxRow[jr], n[jr][its], dyRez[its], kNSgmDy[jr], kNSgmDy[jr]*smTrklt));
1675 16 : continue;
1676 : }
1677 :
1678 24 : test = helper;
1679 24 : Int_t n0 = test.Expand(&clst[ir], index[jr], its);
1680 24 : Double_t rt, dyt, st, xt, smt, pt, qt, ft;
1681 24 : Int_t n1 = test.GetRMS(rt, dyt, st, fX0/*xt*/);
1682 24 : pt = Double_t(n1)/n0;
1683 24 : smt = test.GetSyMean();
1684 48 : qt = test.GetQ()/TMath::Sqrt(1. + fYref[1]*fYref[1] + fZref[1]*fZref[1]);
1685 24 : xt = fX0;
1686 : // correct position
1687 24 : Double_t dxm= fX0 - xt;
1688 24 : yt = fYref[0] - fYref[1]*dxm;
1689 24 : zt = fZref[0] - fZref[1]*dxm;
1690 : // correct tracklet fit for tilt
1691 24 : dyt+= GetTilt()*(zt - zc[idxRow[0]]);
1692 24 : rt += GetTilt() * fZref[1];
1693 : // correct tracklet fit for track position/inclination
1694 24 : dyt = yt - dyt;
1695 24 : rt = (rt - fYref[1])/(1+rt*fYref[1]);
1696 : // report inclination in radians
1697 24 : rt = TMath::ATan(rt);
1698 :
1699 72 : ft = (n0>=2) ? attach->CookLikelihood(chgPos, lyDet, fPt, phiTrk, n0, dyt/*sRef*/, rt*TMath::RadToDeg(), st/smt) : 0.;
1700 24 : Bool_t kAccept(ft>=fTrklt*(1.-kLikeMinRelDecrease[jr]));
1701 :
1702 120 : AliDebug(2, Form("%s seg[%d] row[%2d] n[%2d] dy[%f] r[%+5.2f] s[%+5.2f] f[%f] < %4.2f*F[%f].",
1703 : (kAccept?"Adding":"Reject"), its, idxRow[jr], n0, dyt, rt*TMath::RadToDeg(), st/smt, ft, 1.-kLikeMinRelDecrease[jr], fTrklt*(1.-kLikeMinRelDecrease[jr])));
1704 24 : if(kAccept){
1705 16 : idxTrklt[kts++] = its;
1706 16 : nTrklt = n0;
1707 16 : fTrklt = ft;
1708 16 : rTrklt = rt;
1709 16 : yTrklt = dyt;
1710 16 : sTrklt = st;
1711 16 : smTrklt= smt;
1712 16 : xTrklt = xt;
1713 16 : pTrklt = pt;
1714 16 : qTrklt = qt;
1715 16 : helper.Expand(&clst[ir], index[jr], its);
1716 : }
1717 24 : }
1718 14 : }
1719 :
1720 : //=========================================================
1721 : // Try attaching next segments from second row (if any)
1722 259 : if(nts[1] && (rcLikelihood = zresRow[0]/zresRow[1]) > kRClikeLimit){
1723 : // organize secondaries in decreasing order of their distance from seed
1724 21 : Int_t jr(1), ir(idxRow[jr]);
1725 21 : memset(dyRez, 0, nts[jr]*sizeof(Double_t));
1726 21 : Double_t rot(TMath::Tan(r[0][is]));
1727 88 : for(Int_t jts(0); jts<nts[jr]; jts++) {
1728 23 : dyRez[jts] = TMath::Abs(ym[0][is] - ym[jr][jts] + rot*(xm[0][is]-xm[jr][jts]));
1729 : }
1730 21 : TMath::Sort(nts[jr], dyRez, idx3, kFALSE);
1731 88 : for (Int_t jts(0); jts<nts[jr]; jts++) {
1732 23 : Int_t its(idx3[jts]);
1733 23 : if(dyRez[its] > kNSgmDy[jr]*smTrklt){
1734 35 : AliDebug(2, Form("Reject seg[%d] row[%2d] n[%2d] dy[%f] > %d*s[%f].", its, idxRow[jr], n[jr][its], dyRez[its], kNSgmDy[jr], kNSgmDy[jr]*smTrklt));
1735 7 : continue;
1736 : }
1737 :
1738 16 : test = helper;
1739 16 : Int_t n0 = test.Expand(&clst[ir], index[jr], its);
1740 16 : Double_t rt, dyt, st, xt, smt, pt, qt, ft;
1741 16 : Int_t n1 = test.GetRMS(rt, dyt, st, fX0/*xt*/);
1742 16 : pt = Double_t(n1)/n0;
1743 16 : smt = test.GetSyMean();
1744 32 : qt = test.GetQ()/TMath::Sqrt(1. + fYref[1]*fYref[1] + fZref[1]*fZref[1]);
1745 16 : xt = fX0;
1746 : // correct position
1747 16 : Double_t dxm= fX0 - xt;
1748 16 : yt = fYref[0] - fYref[1]*dxm;
1749 16 : zt = fZref[0] - fZref[1]*dxm;
1750 : // correct tracklet fit for tilt
1751 16 : dyt+= GetTilt()*(zt - zc[idxRow[0]]);
1752 16 : rt += GetTilt() * fZref[1];
1753 : // correct tracklet fit for track position/inclination
1754 16 : dyt = yt - dyt;
1755 16 : rt = (rt - fYref[1])/(1+rt*fYref[1]);
1756 : // report inclination in radians
1757 16 : rt = TMath::ATan(rt);
1758 :
1759 48 : ft = (n0>=2) ? attach->CookLikelihood(chgPos, lyDet, fPt, phiTrk, n0, dyt/*sRef*/, rt*TMath::RadToDeg(), st/smt) : 0.;
1760 16 : Bool_t kAccept(ft>=fTrklt*(1.-kLikeMinRelDecrease[jr]));
1761 :
1762 80 : AliDebug(2, Form("%s seg[%d] row[%2d] n[%2d] dy[%f] r[%+5.2f] s[%+5.2f] f[%f] < %4.2f*F[%f].",
1763 : (kAccept?"Adding":"Reject"), its, idxRow[jr], n0, dyt, rt*TMath::RadToDeg(), st/smt, ft, 1.-kLikeMinRelDecrease[jr], fTrklt*(1.-kLikeMinRelDecrease[jr])));
1764 16 : if(kAccept){
1765 16 : idxTrklt[kts++] = its;
1766 16 : nTrklt = n0;
1767 16 : fTrklt = ft;
1768 16 : rTrklt = rt;
1769 16 : yTrklt = dyt;
1770 16 : sTrklt = st;
1771 16 : smTrklt= smt;
1772 16 : xTrklt = xt;
1773 16 : pTrklt = pt;
1774 16 : qTrklt = qt;
1775 16 : helper.Expand(&clst[ir], index[jr], its);
1776 16 : SetBit(kRowCross, kTRUE); // mark pad row crossing
1777 : }
1778 16 : }
1779 21 : }
1780 : // clear local copy of clusters
1781 11400 : for(Int_t ir(0); ir<kNrows; ir++) clst[ir].Clear();
1782 :
1783 456 : if(!pstreamer &&
1784 228 : ((recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()) ||
1785 228 : AliTRDReconstructor::GetStreamLevel()>1 )
1786 0 : ) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
1787 228 : if(pstreamer){
1788 0 : UChar_t stat(0);
1789 0 : if(IsKink()) SETBIT(stat, 1);
1790 0 : if(IsStandAlone()) SETBIT(stat, 2);
1791 0 : if(IsRowCross()) SETBIT(stat, 3);
1792 0 : TVectorD vidx; vidx.ResizeTo(kts);
1793 0 : for(Int_t its(0); its<kts; its++) vidx[its] = idxTrklt[its];
1794 0 : (*pstreamer) << "AttachClusters2"
1795 0 : << "stat=" << stat
1796 0 : << "ev=" << ev
1797 0 : << "chg=" << chgPos
1798 0 : << "det=" << fDet
1799 0 : << "x0=" << fX0
1800 0 : << "y0=" << fYref[0]
1801 0 : << "z0=" << fZref[0]
1802 0 : << "phi=" << phiTrk
1803 0 : << "tht=" << thtTrk
1804 0 : << "pt=" << fPt
1805 0 : << "s2Trk=" << s2yTrk
1806 0 : << "s2Cl=" << s2Mean
1807 0 : << "idx=" << &vidx
1808 0 : << "n=" << nTrklt
1809 0 : << "q=" << qTrklt
1810 0 : << "f=" << fTrklt
1811 0 : << "x=" << xTrklt
1812 0 : << "y=" << yTrklt
1813 0 : << "r=" << rTrklt
1814 0 : << "s=" << sTrklt
1815 0 : << "sm=" << smTrklt
1816 0 : << "p=" << pTrklt
1817 0 : << "\n";
1818 0 : }
1819 :
1820 :
1821 : //=========================================================
1822 : // Store clusters
1823 : Int_t nselected(0), nc(0);
1824 228 : TObjArray *selected(helper.GetClusters());
1825 684 : if(!selected || !(nselected = selected->GetEntriesFast())){
1826 0 : AliError("Cluster candidates missing !!!");
1827 0 : SetErrorMsg(kAttachClAttach);
1828 0 : return kFALSE;
1829 : }
1830 10662 : for(Int_t ic(0); ic<nselected; ic++){
1831 10206 : if(!(c = (AliTRDcluster*)selected->At(ic))) continue;
1832 5103 : Int_t it(c->GetPadTime()),
1833 5103 : jr(Int_t(helper.GetRow() != c->GetPadRow())),
1834 5103 : idx(it+kNtb*jr);
1835 5103 : if(fClusters[idx]){
1836 675 : AliDebug(1, Form("Multiple clusters/tb for D[%03d] Tb[%02d] Row[%2d]", fDet, it, c->GetPadRow()));
1837 135 : continue; // already booked
1838 : }
1839 : // TODO proper indexing of clusters !!
1840 4968 : fIndexes[idx] = chamber->GetTB(it)->GetGlobalIndex(idxs[idxRow[jr]][ic]);
1841 4968 : fClusters[idx] = c;
1842 4968 : nc++;
1843 4968 : }
1844 1140 : AliDebug(2, Form("Clusters Found[%2d] Attached[%2d] RC[%c]", nselected, nc, IsRowCross()?'y':'n'));
1845 :
1846 : // number of minimum numbers of clusters expected for the tracklet
1847 228 : if (nc < kClmin){
1848 0 : AliDebug(1, Form("NOT ENOUGH CLUSTERS %d ATTACHED TO THE TRACKLET [min %d] FROM FOUND %d.", nc, kClmin, ncls));
1849 0 : SetErrorMsg(kAttachClAttach);
1850 0 : return kFALSE;
1851 : }
1852 228 : SetN(nc);
1853 :
1854 : // Load calibration parameters for this tracklet
1855 : //Calibrate();
1856 :
1857 : // calculate dx for time bins in the drift region (calibration aware)
1858 228 : Float_t x[2] = {0.,0.}; Int_t tb[2]={0,0};
1859 2146 : for (Int_t it = t0, irp=0; irp<2 && it < AliTRDtrackerV1::GetNTimeBins(); it++) {
1860 562 : if(!fClusters[it]) continue;
1861 448 : x[irp] = fClusters[it]->GetX();
1862 448 : tb[irp] = fClusters[it]->GetLocalTimeBin();
1863 448 : irp++;
1864 448 : }
1865 228 : Int_t dtb = tb[1] - tb[0];
1866 680 : fdX = dtb ? (x[0] - x[1]) / dtb : 0.15;
1867 : return kTRUE;
1868 5664 : }
1869 :
1870 : //____________________________________________________________
1871 : void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec)
1872 : {
1873 : // Fill in all derived information. It has to be called after recovery from file or HLT.
1874 : // The primitive data are
1875 : // - list of clusters
1876 : // - detector (as the detector will be removed from clusters)
1877 : // - position of anode wire (fX0) - temporary
1878 : // - track reference position and direction
1879 : // - momentum of the track
1880 : // - time bin length [cm]
1881 : //
1882 : // A.Bercuci <A.Bercuci@gsi.de> Oct 30th 2008
1883 : //
1884 0 : fkReconstructor = rec;
1885 0 : AliTRDgeometry g;
1886 0 : SetPadPlane(g.GetPadPlane(fDet));
1887 :
1888 : //fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]);
1889 : //fTgl = fZref[1];
1890 : Int_t n = 0, nshare = 0, nused = 0;
1891 0 : AliTRDcluster **cit = &fClusters[0];
1892 0 : for(Int_t ic = kNclusters; ic--; cit++){
1893 0 : if(!(*cit)) return;
1894 0 : n++;
1895 0 : if((*cit)->IsShared()) nshare++;
1896 0 : if((*cit)->IsUsed()) nused++;
1897 : }
1898 0 : SetN(n); SetNUsed(nused); SetNShared(nshare);
1899 0 : Fit();
1900 0 : CookLabels();
1901 0 : GetProbability();
1902 0 : }
1903 :
1904 :
1905 : //____________________________________________________________________
1906 : Bool_t AliTRDseedV1::Fit(UChar_t opt)
1907 : {
1908 : //
1909 : // Linear fit of the clusters attached to the tracklet
1910 : //
1911 : // Parameters :
1912 : // - opt : switch for tilt pad correction of cluster y position. Options are
1913 : // 0 no correction [default]
1914 : // 1 full tilt correction [dz/dx and z0]
1915 : // 2 pseudo tilt correction [dz/dx from pad-chamber geometry]
1916 : //
1917 : // Output :
1918 : // True if successful
1919 : //
1920 : // Detailed description
1921 : //
1922 : // Fit in the xy plane
1923 : //
1924 : // The fit is performed to estimate the y position of the tracklet and the track
1925 : // angle in the bending plane. The clusters are represented in the chamber coordinate
1926 : // system (with respect to the anode wire - see AliTRDtrackerV1::FollowBackProlongation()
1927 : // on how this is set). The x and y position of the cluster and also their variances
1928 : // are known from clusterizer level (see AliTRDcluster::GetXloc(), AliTRDcluster::GetYloc(),
1929 : // AliTRDcluster::GetSX() and AliTRDcluster::GetSY()).
1930 : // If gaussian approximation is used to calculate y coordinate of the cluster the position
1931 : // is recalculated taking into account the track angle. The general formula to calculate the
1932 : // error of cluster position in the gaussian approximation taking into account diffusion and track
1933 : // inclination is given for TRD by:
1934 : // BEGIN_LATEX
1935 : // #sigma^{2}_{y} = #sigma^{2}_{PRF} + #frac{x#delta_{t}^{2}}{(1+tg(#alpha_{L}))^{2}} + #frac{x^{2}tg^{2}(#phi-#alpha_{L})tg^{2}(#alpha_{L})}{12}
1936 : // END_LATEX
1937 : //
1938 : // Since errors are calculated only in the y directions, radial errors (x direction) are mapped to y
1939 : // by projection i.e.
1940 : // BEGIN_LATEX
1941 : // #sigma_{x|y} = tg(#phi) #sigma_{x}
1942 : // END_LATEX
1943 : // and also by the lorentz angle correction
1944 : //
1945 : // Fit in the xz plane
1946 : //
1947 : // The "fit" is performed to estimate the radial position (x direction) where pad row cross happens.
1948 : // If no pad row crossing the z position is taken from geometry and radial position is taken from the xy
1949 : // fit (see below).
1950 : //
1951 : // There are two methods to estimate the radial position of the pad row cross:
1952 : // 1. leading cluster radial position : Here the lower part of the tracklet is considered and the last
1953 : // cluster registered (at radial x0) on this segment is chosen to mark the pad row crossing. The error
1954 : // of the z estimate is given by :
1955 : // BEGIN_LATEX
1956 : // #sigma_{z} = tg(#theta) #Delta x_{x_{0}}/12
1957 : // END_LATEX
1958 : // The systematic errors for this estimation are generated by the following sources:
1959 : // - no charge sharing between pad rows is considered (sharp cross)
1960 : // - missing cluster at row cross (noise peak-up, under-threshold signal etc.).
1961 : //
1962 : // 2. charge fit over the crossing point : Here the full energy deposit along the tracklet is considered
1963 : // to estimate the position of the crossing by a fit in the qx plane. The errors in the q directions are
1964 : // parameterized as s_q = q^2. The systematic errors for this estimation are generated by the following sources:
1965 : // - no general model for the qx dependence
1966 : // - physical fluctuations of the charge deposit
1967 : // - gain calibration dependence
1968 : //
1969 : // Estimation of the radial position of the tracklet
1970 : //
1971 : // For pad row cross the radial position is taken from the xz fit (see above). Otherwise it is taken as the
1972 : // interpolation point of the tracklet i.e. the point where the error in y of the fit is minimum. The error
1973 : // in the y direction of the tracklet is (see AliTRDseedV1::GetCovAt()):
1974 : // BEGIN_LATEX
1975 : // #sigma_{y} = #sigma^{2}_{y_{0}} + 2xcov(y_{0}, dy/dx) + #sigma^{2}_{dy/dx}
1976 : // END_LATEX
1977 : // and thus the radial position is:
1978 : // BEGIN_LATEX
1979 : // x = - cov(y_{0}, dy/dx)/#sigma^{2}_{dy/dx}
1980 : // END_LATEX
1981 : //
1982 : // Estimation of tracklet position error
1983 : //
1984 : // The error in y direction is the error of the linear fit at the radial position of the tracklet while in the z
1985 : // direction is given by the cluster error or pad row cross error. In case of no pad row cross this is given by:
1986 : // BEGIN_LATEX
1987 : // #sigma_{y} = #sigma^{2}_{y_{0}} - 2cov^{2}(y_{0}, dy/dx)/#sigma^{2}_{dy/dx} + #sigma^{2}_{dy/dx}
1988 : // #sigma_{z} = Pad_{length}/12
1989 : // END_LATEX
1990 : // For pad row cross the full error is calculated at the radial position of the crossing (see above) and the error
1991 : // in z by the width of the crossing region - being a matter of parameterization.
1992 : // BEGIN_LATEX
1993 : // #sigma_{z} = tg(#theta) #Delta x_{x_{0}}/12
1994 : // END_LATEX
1995 : // In case of no tilt correction (default in the barrel tracking) the tilt is taken into account by the rotation of
1996 : // the covariance matrix. See AliTRDseedV1::GetCovAt() for details.
1997 : //
1998 : // Author
1999 : // A.Bercuci <A.Bercuci@gsi.de>
2000 :
2001 0 : if(!fkReconstructor){
2002 0 : AliError("The tracklet needs the reconstruction setup. Please initialize by SetReconstructor().");
2003 0 : return kFALSE;
2004 : }
2005 0 : if(!IsCalibrated()) Calibrate();
2006 0 : if(opt>2){
2007 0 : AliWarning(Form("Option [%d] outside range [0, 2]. Using default",opt));
2008 : opt=0;
2009 0 : }
2010 :
2011 : const Int_t kClmin = 8;
2012 : const Float_t kScalePulls = 10.; // factor to scale y pulls - NOT UNDERSTOOD
2013 : // get track direction
2014 0 : Double_t y0 = fYref[0];
2015 0 : Double_t dydx = fYref[1];
2016 0 : Double_t z0 = fZref[0];
2017 0 : Double_t dzdx = fZref[1];
2018 :
2019 0 : AliTRDtrackerV1::AliTRDLeastSquare fitterY;
2020 0 : AliTRDtrackerV1::AliTRDLeastSquare fitterZ;
2021 :
2022 : // book cluster information
2023 0 : Double_t qc[kNclusters], xc[kNclusters], yc[kNclusters], zc[kNclusters], sy[kNclusters];
2024 :
2025 0 : Bool_t tilt(opt==1) // full tilt correction
2026 0 : ,pseudo(opt==2) // pseudo tilt correction
2027 0 : ,rc(IsRowCross()) // row cross candidate
2028 0 : ,kDZDX(IsPrimary());// switch dzdx calculation for barrel primary tracks
2029 : Int_t n(0); // clusters used in fit
2030 0 : AliTRDcluster *c(NULL), *cc(NULL), **jc = &fClusters[0];
2031 0 : const AliTRDrecoParam* const recoParam = fkReconstructor->GetRecoParam(); //the dynamic cast in GetRecoParam is slow, so caching the pointer to it
2032 :
2033 0 : const Char_t *tcName[]={"NONE", "FULL", "HALF"};
2034 0 : AliDebug(2, Form("Options : TC[%s] dzdx[%c]", tcName[opt], kDZDX?'Y':'N'));
2035 :
2036 :
2037 0 : for (Int_t ic=0; ic<kNclusters; ic++, ++jc) {
2038 0 : xc[ic] = -1.; yc[ic] = 999.; zc[ic] = 999.; sy[ic] = 0.;
2039 0 : if(!(c = (*jc))) continue;
2040 0 : if(!c->IsInChamber()) continue;
2041 : // compute pseudo tilt correction
2042 0 : if(kDZDX){
2043 0 : fZfit[0] = c->GetZ();
2044 0 : if(rc){
2045 0 : for(Int_t kc=AliTRDseedV1::kNtb; kc<AliTRDseedV1::kNclusters; kc++){
2046 0 : if(!(cc=fClusters[kc])) continue;
2047 0 : if(!cc->IsInChamber()) continue;
2048 0 : fZfit[0] += cc->GetZ(); fZfit[0] *= 0.5;
2049 0 : break;
2050 : }
2051 0 : }
2052 0 : fZfit[1] = fZfit[0]/fX0;
2053 0 : if(rc){
2054 0 : fZfit[0] += fZfit[1]*0.5*AliTRDgeometry::CdrHght();
2055 0 : fZfit[1] = fZfit[0]/fX0;
2056 0 : }
2057 : kDZDX=kFALSE;
2058 0 : }
2059 :
2060 : // TODO use this information to adjust cluster error parameterization
2061 : // Float_t w = 1.;
2062 : // if(c->GetNPads()>4) w = .5;
2063 : // if(c->GetNPads()>5) w = .2;
2064 :
2065 : // cluster charge
2066 0 : qc[n] = TMath::Abs(c->GetQ());
2067 : // pad row of leading
2068 :
2069 0 : xc[n] = fX0 - c->GetX();
2070 :
2071 : // Recalculate cluster error based on tracking information
2072 0 : c->SetSigmaY2(fS2PRF, fDiffT, fExB, xc[n], -1./*zcorr?zt:-1.*/, dydx);
2073 0 : c->SetSigmaZ2(fPad[0]*fPad[0]/12.); // for HLT
2074 0 : sy[n] = TMath::Sqrt(c->GetSigmaY2());
2075 :
2076 0 : yc[n] = recoParam->UseGAUS() ?
2077 0 : c->GetYloc(y0, sy[n], GetPadWidth()): c->GetY();
2078 0 : zc[n] = c->GetZ();
2079 :
2080 : //optional r-phi correction
2081 : //printf(" n[%2d] yc[%7.5f] ", n, yc[n]);
2082 : Float_t correction(0.);
2083 0 : if(tilt) correction = fPad[2]*(xc[n]*dzdx + zc[n] - z0);
2084 0 : else if(pseudo) correction = fPad[2]*(xc[n]*fZfit[1] + zc[n]-fZfit[0]);
2085 0 : yc[n]-=correction;
2086 : //printf("corr(%s%s)[%7.5f] yc1[%7.5f]\n", (tilt?"TC":""), (zcorr?"PC":""), correction, yc[n]);
2087 :
2088 0 : AliDebug(5, Form(" tb[%2d] dx[%6.3f] y[%6.2f+-%6.3f]", c->GetLocalTimeBin(), xc[n], yc[n], sy[n]));
2089 0 : fitterY.AddPoint(&xc[n], yc[n], sy[n]);
2090 0 : if(rc) fitterZ.AddPoint(&xc[n], qc[n]*(ic<kNtb?1.:-1.), 1.);
2091 0 : n++;
2092 0 : }
2093 :
2094 : // to few clusters
2095 0 : if (n < kClmin){
2096 0 : AliDebug(1, Form("Not enough clusters to fit. Clusters: Attached[%d] Fit[%d].", GetN(), n));
2097 0 : SetErrorMsg(kFitCl);
2098 0 : return kFALSE;
2099 : }
2100 : // fit XY
2101 0 : if(!fitterY.Eval()){
2102 0 : AliDebug(1, "Fit Y failed.");
2103 0 : SetErrorMsg(kFitFailedY);
2104 0 : return kFALSE;
2105 : }
2106 0 : fYfit[0] = fitterY.GetFunctionParameter(0);
2107 0 : fYfit[1] = -fitterY.GetFunctionParameter(1);
2108 : // store covariance
2109 0 : Double_t p[3];
2110 0 : fitterY.GetCovarianceMatrix(p);
2111 0 : fCov[0] = kScalePulls*p[1]; // variance of y0
2112 0 : fCov[1] = kScalePulls*p[2]; // covariance of y0, dydx
2113 0 : fCov[2] = kScalePulls*p[0]; // variance of dydx
2114 : // the ref radial position is set at the minimum of
2115 : // the y variance of the tracklet
2116 0 : fX = -fCov[1]/fCov[2];
2117 0 : fS2Y = fCov[0] +2.*fX*fCov[1] + fX*fX*fCov[2];
2118 :
2119 0 : Float_t xs=fX+.5*AliTRDgeometry::CamHght();
2120 0 : if(xs < 0. || xs > AliTRDgeometry::CamHght()+AliTRDgeometry::CdrHght()){
2121 0 : AliDebug(1, Form("Ref radial position ouside chamber x[%5.2f].", fX));
2122 0 : SetErrorMsg(kFitFailedY);
2123 0 : return kFALSE;
2124 : }
2125 :
2126 : /* // THE LEADING CLUSTER METHOD for z fit
2127 : Float_t xMin = fX0;
2128 : Int_t ic=n=kNclusters-1; jc = &fClusters[ic];
2129 : AliTRDcluster *c0 =0x0, **kc = &fClusters[kNtb-1];
2130 : for(; ic>kNtb; ic--, --jc, --kc){
2131 : if((c0 = (*kc)) && c0->IsInChamber() && (xMin>c0->GetX())) xMin = c0->GetX();
2132 : if(!(c = (*jc))) continue;
2133 : if(!c->IsInChamber()) continue;
2134 : zc[kNclusters-1] = c->GetZ();
2135 : fX = fX0 - c->GetX();
2136 : }
2137 : fZfit[0] = .5*(zc[0]+zc[kNclusters-1]); fZfit[1] = 0.;
2138 : // Error parameterization
2139 : fS2Z = fdX*fZref[1];
2140 : fS2Z *= fS2Z; fS2Z *= 0.2887; // 1/sqrt(12)*/
2141 :
2142 : // fit QZ
2143 0 : if(opt!=1 && IsRowCross()){
2144 0 : if(!fitterZ.Eval()) SetErrorMsg(kFitFailedZ);
2145 0 : if(!HasError(kFitFailedZ) && TMath::Abs(fitterZ.GetFunctionParameter(1))>1.e-10){
2146 : // TODO - one has to recalculate xy fit based on
2147 : // better knowledge of z position
2148 : // Double_t x = -fitterZ.GetFunctionParameter(0)/fitterZ.GetFunctionParameter(1);
2149 : // Double_t z0 = .5*(zc[0]+zc[n-1]);
2150 : // fZfit[0] = z0 + fZfit[1]*x;
2151 : // fZfit[1] = fZfit[0]/fX0;
2152 : // redo fit on xy plane
2153 : }
2154 : // temporary external error parameterization
2155 0 : fS2Z = 0.05+0.4*TMath::Abs(fZref[1]); fS2Z *= fS2Z;
2156 : // TODO correct formula
2157 : //fS2Z = sigma_x*TMath::Abs(fZref[1]);
2158 0 : } else {
2159 : //fZfit[0] = zc[0] + dzdx*0.5*AliTRDgeometry::CdrHght();
2160 0 : fS2Z = GetPadLength()*GetPadLength()/12.;
2161 : }
2162 0 : return kTRUE;
2163 0 : }
2164 :
2165 :
2166 : //____________________________________________________________________
2167 : Bool_t AliTRDseedV1::FitRobust(AliTRDpadPlane *pp, TGeoHMatrix *mDet, Float_t bz, Int_t chg, Int_t opt, Float_t tgl)
2168 : {
2169 : //
2170 : // Linear fit of the clusters attached to the tracklet
2171 : // The fit is performed in local chamber coordinates (27.11.2013) to take into account correctly the misalignment
2172 : // Also the pad row cross is checked here and some background is removed
2173 : //
2174 : // Author
2175 : // A.Bercuci <A.Bercuci@gsi.de>
2176 :
2177 : TTreeSRedirector *pstreamer(NULL);
2178 228 : const AliTRDrecoParam* const recoParam = fkReconstructor->GetRecoParam();
2179 456 : if( (recoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 3 && fkReconstructor->IsDebugStreaming()) ||
2180 228 : AliTRDReconstructor::GetStreamLevel()>3 ) pstreamer = fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
2181 :
2182 : // factor to scale y pulls.
2183 : // ideally if error parametrization correct this is 1.
2184 : //Float_t lyScaler = 1./(AliTRDgeometry::GetLayer(fDet)+1.);
2185 : Float_t kScalePulls = 1.;
2186 228 : AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
2187 228 : if(!calibration){
2188 0 : AliWarning("No access to calibration data");
2189 0 : } else {
2190 : // Retrieve the CDB container class with the parametric likelihood
2191 228 : const AliTRDCalTrkAttach *attach = calibration->GetAttachObject();
2192 228 : if(!attach){
2193 0 : AliWarning("No usable AttachClusters calib object.");
2194 0 : } else {
2195 : //kScalePulls = attach->GetScaleCov();//*lyScaler;
2196 : }
2197 : // Retrieve chamber status
2198 228 : SetChmbGood(calibration->IsChamberGood(fDet));
2199 228 : if(!IsChmbGood()) kScalePulls*=10.;
2200 : }
2201 228 : AliTRDCommonParam *cp = AliTRDCommonParam::Instance();
2202 684 : Double_t freq(cp?cp->GetSamplingFrequency():10.);
2203 :
2204 : // evaluate locally z and dzdx from TRD only information
2205 228 : if(EstimatedCrossPoint(pp, bz)<0.) return kFALSE;
2206 :
2207 : //printf("D%03d RC[%c] dzdx[%f %f] opt[%d]\n", fDet, IsRowCross()?'y':'n', fZref[1], fZfit[1], opt);
2208 : Double_t //xchmb = 0.5 * AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick(),
2209 : //zchmb = 0.5 * (pp->GetRow0() + pp->GetRowEnd()),
2210 228 : z0(0.5 * (pp->GetRow0() + pp->GetRowEnd()) + fZfit[0]),
2211 228 : DZ(pp->GetRow0() - pp->GetRowEnd() - pp->GetAnodeWireOffset() + fZfit[0]),
2212 : z, d(-1.);
2213 456 : Double_t xc[kNclusters], yc[kNclusters], dz(0.), dzdx(0.),
2214 : s2dz(0.), s2dzdx(0.), sy[kNclusters],
2215 228 : s2x((8.33e-2/freq/freq+1.56e-2)*fVD*fVD), // error of 1tb + error of mean time (TRF)
2216 456 : t2(fPad[2]*fPad[2]), loc[3]={0.};
2217 228 : Int_t n(0), // clusters used in fit
2218 : row[]={-1, -1};// pad row spanned by the tracklet
2219 228 : Double_t ycorr(UnbiasY(IsRowCross(), bz)),
2220 228 : kS2Ycorr(recoParam->GetS2Ycorr(IsRowCross(), chg>0));
2221 :
2222 228 : AliTRDcluster *c(NULL), **jc = &fClusters[0];
2223 14592 : for(Int_t ic=0; ic<kNtb; ic++, ++jc) {
2224 7068 : if(!(c = (*jc))) continue;
2225 4804 : if(!c->IsInChamber()) continue;
2226 4486 : if(row[0]<0){
2227 228 : row[0] = c->GetPadRow();
2228 228 : z = pp->GetRowPos(row[0]) - 0.5*pp->GetRowSize(row[0]);
2229 228 : switch(opt){
2230 : case 0: // no dz correction (only for RC tracklet) and dzdx from chamber position assuming primary
2231 470 : dzdx = IsRowCross()?fZfit[1]:0.;
2232 470 : s2dzdx= IsRowCross()?GetS2DZDX(dzdx):0.;
2233 470 : dz = IsRowCross()?(z - z0):0.;
2234 470 : s2dz = IsRowCross()?fS2Z:0.;
2235 228 : break;
2236 : case 1: // dz correction only for RC tracklet and dzdx from reference
2237 0 : dzdx = fZref[1];
2238 0 : dz = IsRowCross()?(z - z0):0.;
2239 0 : break;
2240 : case 2: // full z correction (z0 & dzdx from reference)
2241 0 : dzdx = fZref[1];
2242 0 : dz = c->GetZ()-fZref[0];
2243 0 : break;
2244 : default:
2245 0 : AliError(Form("Wrong option fit %d !", opt));
2246 0 : break;
2247 : }
2248 : }
2249 : //Use local cluster coordinates
2250 : //A.Bercuci 27.11.13/30.06.14
2251 4486 : Double_t trk[] = {c->GetX(), c->GetY(), c->GetZ()};
2252 4486 : mDet->MasterToLocal(trk, loc);
2253 4486 : xc[n] = AliTRDgeometry::AnodePos()-loc[0]; //c->GetXloc(fT0, fVD); // c->GetX();
2254 4486 : yc[n] = loc[1]; //c->GetYloc(pp->GetColPos(col) + .5*cs, fS2PRF, cs) - xc[n]*fExB; //c->GetY();
2255 4486 : yc[n]-= fPad[2]*(dz+xc[n]*dzdx);
2256 4486 : yc[n]-= ycorr;
2257 4486 : if(IsRowCross()){ // estimate closest distance to anode wire
2258 166 : d = DZ-xc[n]*dzdx;
2259 166 : d -= ((Int_t)(2 * d)) / 2.0;
2260 244 : if (d > 0.25) d = 0.5 - d;
2261 : }
2262 : // recalculate cluster error from knowledge of the track inclination in the bending plane
2263 : // and eventually distance to anode wire
2264 4486 : c->SetSigmaY2(fS2PRF, fDiffT, fExB, xc[n], d, fYref[1]);
2265 4486 : s2x = c->GetSX(c->GetLocalTimeBin(), d); s2x*=s2x;
2266 13458 : sy[n] = c->GetSigmaY2()>0?(TMath::Min(Double_t(c->GetSigmaY2()), 6.4e-3)):6.4e-3;
2267 4486 : sy[n]+= t2*(s2dz+xc[n]*xc[n]*s2dzdx+dzdx*dzdx*s2x);
2268 4486 : sy[n] = TMath::Sqrt(sy[n]);
2269 4486 : n++;
2270 4486 : }
2271 14592 : for(Int_t ic=kNtb; ic<kNclusters; ic++, ++jc) {
2272 7068 : if(!(c = (*jc))) continue;
2273 164 : if(!c->IsInChamber()) continue;
2274 156 : if(row[1]<0){
2275 14 : row[1] = c->GetPadRow();
2276 14 : z = pp->GetRowPos(row[1]) - 0.5*pp->GetRowSize(row[1]);
2277 14 : switch(opt){
2278 : case 0: // no dz correction (only for RC tracklet) and dzdx from chamber position assuming primary
2279 : //dzdx = fZfit[1];
2280 14 : dz = z - z0;
2281 14 : break;
2282 : case 1: // dz correction only for RC tracklet and dzdx from reference
2283 : //dzdx = fZref[1];
2284 0 : dz = z - z0;
2285 0 : break;
2286 : case 2: // full z correction (z0 & dzdx from reference)
2287 : //dzdx = fZref[1];
2288 0 : dz = c->GetZ()-fZref[0];
2289 0 : break;
2290 : default:
2291 0 : AliError(Form("Wrong option fit %d !", opt));
2292 0 : break;
2293 : }
2294 : }
2295 :
2296 : //Use local cluster coordinates - the code should be identical with AliTRDtransform::Transform() !!!
2297 : //A.Bercuci 27.11.13
2298 156 : Double_t trk[] = {c->GetX(), c->GetY(), c->GetZ()};
2299 156 : mDet->MasterToLocal(trk, loc);
2300 156 : xc[n] = AliTRDgeometry::AnodePos()-loc[0]; //c->GetXloc(fT0, fVD); // c->GetX();
2301 156 : yc[n] = loc[1]; //c->GetYloc(pp->GetColPos(col) + .5*cs, fS2PRF, cs) - xc[n]*fExB; //c->GetY();
2302 156 : yc[n]-= fPad[2]*(dz+xc[n]*dzdx);
2303 156 : yc[n]-= ycorr;
2304 :
2305 156 : d = DZ-xc[n]*dzdx;
2306 156 : d -= ((Int_t)(2 * d)) / 2.0;
2307 262 : if (d > 0.25) d = 0.5 - d;
2308 156 : c->SetSigmaY2(fS2PRF, fDiffT, fExB, xc[n], d, fYref[1]);
2309 156 : s2x = c->GetSX(c->GetLocalTimeBin(), d); s2x*=s2x;
2310 468 : sy[n] = c->GetSigmaY2()>0?(TMath::Min(Double_t(c->GetSigmaY2()), 6.4e-3)):6.4e-3;
2311 156 : sy[n]+= t2*(s2dz+xc[n]*xc[n]*s2dzdx+dzdx*dzdx*s2x);
2312 156 : sy[n] = TMath::Sqrt(sy[n]);
2313 156 : n++;
2314 156 : }
2315 :
2316 228 : UChar_t status(0);
2317 : // the ref radial position is set close to the minimum of
2318 : // the y variance of the tracklet
2319 228 : fX = 0.;//set reference to anode wire
2320 228 : Double_t par[3] = {0.,0.,fX}, cov[3];
2321 228 : if(!AliTRDtrackletOflHelper::Fit(n, xc, yc, sy, par, 1.5, cov)) {
2322 0 : AliDebug(1, Form("Tracklet fit failed D[%03d].", fDet));
2323 0 : SetErrorMsg(kFitCl);
2324 0 : return kFALSE;
2325 : }
2326 228 : fYfit[0] = par[0] - fX * par[1];
2327 228 : fYfit[1] = -par[1];
2328 : //printf(" yfit: %f [%f] x[%e] dydx[%f]\n", fYfit[0], par[0], fX, par[1]);
2329 : // store covariance
2330 228 : fCov[0] = kScalePulls*kS2Ycorr*cov[0]; // variance of y0
2331 228 : fCov[1] = kScalePulls*cov[2]; // covariance of y0, dydx
2332 228 : fCov[2] = kScalePulls*cov[1]; // variance of dydx
2333 : // check radial position
2334 228 : Float_t xs=fX+.5*AliTRDgeometry::CamHght();
2335 456 : if(xs < 0. || xs > AliTRDgeometry::CamHght()+AliTRDgeometry::CdrHght()){
2336 0 : AliDebug(1, Form("Ref radial position x[%5.2f] ouside D[%3d].", fX, fDet));
2337 0 : SetErrorMsg(kFitFailedY);
2338 0 : return kFALSE;
2339 : }
2340 228 : if(!IsRowCross()){
2341 : // Double_t padEffLength(fPad[0] - TMath::Abs(dzdx));
2342 214 : Double_t padEffLength(fPad[0]);
2343 : //
2344 : // correct Z for most probable value accounting for the fact that it is not RC
2345 214 : double zCorrNRC = tgl*recoParam->GetZCorrCoefNRC();
2346 214 : padEffLength -= TMath::Abs(zCorrNRC*2);
2347 214 : fZfit[0] += zCorrNRC;
2348 214 : fYfit[0] += GetTilt()*zCorrNRC;
2349 214 : fS2Z = padEffLength*padEffLength/12.;
2350 214 : }
2351 684 : AliDebug(2, Form("[I] x[cm]=%6.2f y[cm]=%+5.2f z[cm]=%+6.2f dydx[deg]=%+5.2f", GetX(), GetY(), GetZ(), TMath::ATan(fYfit[1])*TMath::RadToDeg()));
2352 :
2353 228 : if(pstreamer){
2354 0 : Float_t x= fX0 -fX,
2355 0 : y = GetY(),
2356 0 : yt = fYref[0]-fX*fYref[1];
2357 0 : SETBIT(status, 2);
2358 0 : TVectorD vcov(3); vcov[0]=cov[0];vcov[1]=cov[1];vcov[2]=cov[2];
2359 0 : Double_t sm(0.), chi2(0.), tmp, dy[kNclusters];
2360 0 : for(Int_t ic(0); ic<n; ic++){
2361 0 : sm += sy[ic];
2362 0 : dy[ic] = yc[ic]-(fYfit[0]+(xc[ic]-fX0)*fYfit[1]); tmp = dy[ic]/sy[ic];
2363 0 : chi2 += tmp*tmp;
2364 : }
2365 0 : sm /= n; chi2 = TMath::Sqrt(chi2);
2366 0 : Double_t m(0.), s(0.);
2367 0 : AliMathBase::EvaluateUni(n, dy, m, s, 0);
2368 0 : (*pstreamer) << "FitRobust4"
2369 0 : << "stat=" << status
2370 0 : << "opt=" << opt
2371 0 : << "ncl=" << n
2372 0 : << "det=" << fDet
2373 0 : << "x0=" << fX0
2374 0 : << "y0=" << fYfit[0]
2375 0 : << "x=" << x
2376 0 : << "y=" << y
2377 0 : << "dydx=" << fYfit[1]
2378 0 : << "pt=" << fPt
2379 0 : << "yt=" << yt
2380 0 : << "dydxt="<< fYref[1]
2381 0 : << "cov=" << &vcov
2382 0 : << "chi2=" << chi2
2383 0 : << "sm=" << sm
2384 0 : << "ss=" << s
2385 0 : << "\n";
2386 0 : }
2387 228 : return kTRUE;
2388 456 : }
2389 :
2390 : //___________________________________________________________________
2391 : void AliTRDseedV1::SetXYZ(TGeoHMatrix *mDet)
2392 : {
2393 : // Apply alignment to the local position of tracklet
2394 : // A.Bercuci @ 27.11.2013
2395 :
2396 456 : Double_t loc[] = {AliTRDgeometry::AnodePos(), GetLocalY(), fZfit[0]}, trk[3]={0.};
2397 228 : mDet->LocalToMaster(loc, trk);
2398 228 : fX0 = trk[0];
2399 228 : fY = trk[1];
2400 228 : fZ = trk[2];
2401 : return;
2402 : // if(!IsRowCross()){/*fZfit[1] *= 1.09;*/ return;}
2403 : // // recalculate local z coordinate assuming primary track for row cross tracklets
2404 : // Double_t zoff(fZ-fZfit[0]); // no alignment aware !
2405 : // //printf("SetXYZ : zoff[%f] zpp[%f]\n", zoff, zpp);
2406 : // fZfit[0] = fX0*fZfit[1] - zoff;
2407 : // // recalculate tracking coordinates based on the new z coordinate
2408 : // loc[2] = fZfit[0];
2409 : // mDet->LocalToMaster(loc, trk);
2410 : // fX0 = trk[0];
2411 : // fY = trk[1];
2412 : // fZ = trk[2];//-zcorr[stk];
2413 : //fZfit[1] = /*(IsRowCross()?1.05:1.09)**/fZ/(fX0-fS2Y);
2414 228 : }
2415 :
2416 :
2417 : //___________________________________________________________________
2418 : void AliTRDseedV1::Print(Option_t *o) const
2419 : {
2420 : //
2421 : // Printing the seedstatus
2422 : //
2423 :
2424 0 : AliInfo(Form("Det[%3d] X0[%7.2f] Pad{L[%5.2f] W[%5.2f] Tilt[%+6.2f]}", fDet, fX0, GetPadLength(), GetPadWidth(), GetTilt()));
2425 0 : AliInfo(Form("N[%2d] Nused[%2d] Nshared[%2d] [%d]", GetN(), GetNUsed(), GetNShared(), fN));
2426 0 : AliInfo(Form("FLAGS : RC[%c] Kink[%c] SA[%c]", IsRowCross()?'y':'n', IsKink()?'y':'n', IsStandAlone()?'y':'n'));
2427 0 : AliInfo(Form("CALIB PARAMS : T0[%5.2f] Vd[%5.2f] s2PRF[%5.2f] ExB[%5.2f] Dl[%5.2f] Dt[%5.2f]", fT0, fVD, fS2PRF, fExB, fDiffL, fDiffT));
2428 :
2429 0 : Double_t cov[3], x=GetX();
2430 0 : GetCovAt(x, cov);
2431 0 : AliInfo(" | x[cm] | y[cm] | z[cm] | dydx | dzdx |");
2432 0 : AliInfo(Form("Fit | %7.2f | %7.2f+-%7.2f | %7.2f+-%7.2f| %5.2f | ----- |", x, GetY(), TMath::Sqrt(cov[0]), GetZ(), TMath::Sqrt(cov[2]), fYfit[1]));
2433 0 : AliInfo(Form("Ref | %7.2f | %7.2f+-%7.2f | %7.2f+-%7.2f| %5.2f | %5.2f |", x, fYref[0]-fX*fYref[1], TMath::Sqrt(fRefCov[0]), fZref[0]-fX*fYref[1], TMath::Sqrt(fRefCov[2]), fYref[1], fZref[1]));
2434 0 : AliInfo(Form("P / Pt [GeV/c] = %f / %f", GetMomentum(), fPt));
2435 0 : if(IsStandAlone()) AliInfo(Form("C Rieman / Vertex [1/cm] = %f / %f", fC[0], fC[1]));
2436 0 : AliInfo(Form("dEdx [a.u.] = %f / %f / %f / %f / %f/ %f / %f / %f", fdEdx[0], fdEdx[1], fdEdx[2], fdEdx[3], fdEdx[4], fdEdx[5], fdEdx[6], fdEdx[7]));
2437 0 : AliInfo(Form("PID = %5.3f / %5.3f / %5.3f / %5.3f / %5.3f", fProb[0], fProb[1], fProb[2], fProb[3], fProb[4]));
2438 :
2439 0 : if(strcmp(o, "a")!=0) return;
2440 :
2441 0 : AliTRDcluster* const* jc = &fClusters[0];
2442 0 : for(int ic=0; ic<kNclusters; ic++, jc++) {
2443 0 : if(!(*jc)) continue;
2444 0 : (*jc)->Print(o);
2445 0 : }
2446 0 : }
2447 :
2448 :
2449 : //___________________________________________________________________
2450 : Bool_t AliTRDseedV1::IsEqual(const TObject *o) const
2451 : {
2452 : // Checks if current instance of the class has the same essential members
2453 : // as the given one
2454 :
2455 0 : if(!o) return kFALSE;
2456 0 : const AliTRDseedV1 *inTracklet = dynamic_cast<const AliTRDseedV1*>(o);
2457 0 : if(!inTracklet) return kFALSE;
2458 :
2459 0 : for (Int_t i = 0; i < 2; i++){
2460 0 : if ( fYref[i] != inTracklet->fYref[i] ) return kFALSE;
2461 0 : if ( fZref[i] != inTracklet->fZref[i] ) return kFALSE;
2462 : }
2463 :
2464 0 : if ( TMath::Abs(fS2Y - inTracklet->fS2Y)>1.e-10 ) return kFALSE;
2465 0 : if ( TMath::Abs(GetTilt() - inTracklet->GetTilt())>1.e-10 ) return kFALSE;
2466 0 : if ( TMath::Abs(GetPadLength() - inTracklet->GetPadLength())>1.e-10 ) return kFALSE;
2467 :
2468 0 : for (Int_t i = 0; i < kNclusters; i++){
2469 : // if ( fX[i] != inTracklet->GetX(i) ) return kFALSE;
2470 : // if ( fY[i] != inTracklet->GetY(i) ) return kFALSE;
2471 : // if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE;
2472 0 : if ( fIndexes[i] != inTracklet->fIndexes[i] ) return kFALSE;
2473 : }
2474 : // if ( fUsable != inTracklet->fUsable ) return kFALSE;
2475 :
2476 0 : for (Int_t i=0; i < 2; i++){
2477 0 : if ( fYfit[i] != inTracklet->fYfit[i] ) return kFALSE;
2478 0 : if ( fZfit[i] != inTracklet->fZfit[i] ) return kFALSE;
2479 0 : if ( fLabels[i] != inTracklet->fLabels[i] ) return kFALSE;
2480 : }
2481 :
2482 : /* if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE;
2483 : if ( fZProb != inTracklet->GetZProb() ) return kFALSE;*/
2484 0 : if ( fN != inTracklet->fN ) return kFALSE;
2485 : //if ( fNUsed != inTracklet->fNUsed ) return kFALSE;
2486 : //if ( fFreq != inTracklet->GetFreq() ) return kFALSE;
2487 : //if ( fNChange != inTracklet->GetNChange() ) return kFALSE;
2488 :
2489 0 : if ( TMath::Abs(fC[0] - inTracklet->fC[0])>1.e-10 ) return kFALSE;
2490 : //if ( fCC != inTracklet->GetCC() ) return kFALSE;
2491 0 : if ( TMath::Abs(fChi2 - inTracklet->fChi2)>1.e-10 ) return kFALSE;
2492 : // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE;
2493 :
2494 0 : if ( fDet != inTracklet->fDet ) return kFALSE;
2495 0 : if ( TMath::Abs(fPt - inTracklet->fPt)>1.e-10 ) return kFALSE;
2496 0 : if ( TMath::Abs(fdX - inTracklet->fdX)>1.e-10 ) return kFALSE;
2497 :
2498 0 : for (Int_t iCluster = 0; iCluster < kNclusters; iCluster++){
2499 0 : AliTRDcluster *curCluster = fClusters[iCluster];
2500 0 : AliTRDcluster *inCluster = inTracklet->fClusters[iCluster];
2501 0 : if (curCluster && inCluster){
2502 0 : if (! curCluster->IsEqual(inCluster) ) {
2503 0 : curCluster->Print();
2504 0 : inCluster->Print();
2505 0 : return kFALSE;
2506 : }
2507 : } else {
2508 : // if one cluster exists, and corresponding
2509 : // in other tracklet doesn't - return kFALSE
2510 0 : if(curCluster || inCluster) return kFALSE;
2511 : }
2512 0 : }
2513 0 : return kTRUE;
2514 0 : }
2515 :
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