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 : #include "AliHMPIDParam.h" //class header
16 : #include "AliHMPIDDigit.h" //ctor
17 : #include "AliLog.h" //general
18 : #include <AliRunLoader.h> //Stack()
19 : #include <AliStack.h> //Stack()
20 : #include "AliCDBManager.h" //ctor
21 : #include "AliCDBEntry.h" //ctor
22 : #include <TLatex.h> //TestTrans()
23 : #include <TView.h> //TestTrans()
24 : #include <TPolyMarker3D.h> //TestTrans()
25 : #include <TRotation.h>
26 : #include <TParticle.h> //Stack()
27 : #include <TGeoPhysicalNode.h> //ctor
28 : #include <TGeoBBox.h>
29 : #include <TF1.h> //ctor
30 :
31 16 : ClassImp(AliHMPIDParam)
32 :
33 :
34 : // Mathieson constant definition
35 : const Double_t AliHMPIDParam::fgkD = 0.222500; // ANODE-CATHODE distance 0.445/2
36 : // K3 = 0.66 along the wires (anode-cathode/wire pitch=0.5625)
37 16 : const Double_t AliHMPIDParam::fgkSqrtK3x = TMath::Sqrt(0.66);
38 16 : const Double_t AliHMPIDParam::fgkK2x = TMath::PiOver2()*(1 - 0.5*fgkSqrtK3x);
39 16 : const Double_t AliHMPIDParam::fgkK1x = 0.25*fgkK2x*fgkSqrtK3x/TMath::ATan(fgkSqrtK3x);
40 16 : const Double_t AliHMPIDParam::fgkK4x = fgkK1x/(fgkK2x*fgkSqrtK3x);
41 : // K3 = 0.87 along the wires (anode-cathode/wire pitch=0.5625)
42 16 : const Double_t AliHMPIDParam::fgkSqrtK3y = TMath::Sqrt(0.87);
43 16 : const Double_t AliHMPIDParam::fgkK2y = TMath::PiOver2()*(1 - 0.5*fgkSqrtK3y);
44 16 : const Double_t AliHMPIDParam::fgkK1y = 0.25*fgkK2y*fgkSqrtK3y/TMath::ATan(fgkSqrtK3y);
45 16 : const Double_t AliHMPIDParam::fgkK4y = fgkK1y/(fgkK2y*fgkSqrtK3y);
46 : //
47 :
48 :
49 : Float_t AliHMPIDParam::fgkMinPcX[]={0.,0.,0.,0.,0.,0.};
50 : Float_t AliHMPIDParam::fgkMaxPcX[]={0.,0.,0.,0.,0.,0.};
51 : Float_t AliHMPIDParam::fgkMinPcY[]={0.,0.,0.,0.,0.,0.};
52 : Float_t AliHMPIDParam::fgkMaxPcY[]={0.,0.,0.,0.,0.,0.};
53 :
54 : Bool_t AliHMPIDParam::fgMapPad[160][144][7];
55 :
56 : Float_t AliHMPIDParam::fgCellX=0.;
57 : Float_t AliHMPIDParam::fgCellY=0.;
58 :
59 : Float_t AliHMPIDParam::fgPcX=0;
60 : Float_t AliHMPIDParam::fgPcY=0;
61 :
62 : Float_t AliHMPIDParam::fgAllX=0;
63 : Float_t AliHMPIDParam::fgAllY=0;
64 :
65 : Bool_t AliHMPIDParam::fgInstanceType=kTRUE;
66 :
67 : AliHMPIDParam* AliHMPIDParam::fgInstance=0x0; //singleton pointer
68 :
69 : Int_t AliHMPIDParam::fgNSigmas = 4;
70 : Int_t AliHMPIDParam::fgThreshold= 4;
71 :
72 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
73 : AliHMPIDParam::AliHMPIDParam(Bool_t noGeo):
74 3 : TNamed("HmpidParam","default version"),
75 3 : fX(0), fY(0), fRefIdx(1.28947),fPhotEMean(6.675),fTemp(25) //just set a refractive index for C6F14 at ephot=6.675 eV @ T=25 C
76 9 : {
77 : // Here all the intitializition is taken place when AliHMPIDParam::Instance() is invoked for the first time.
78 : // In particular, matrices to be used for LORS<->MARS trasnformations are initialized from TGeo structure.
79 : // Note that TGeoManager should be already initialized from geometry.root file
80 :
81 3 : AliCDBManager *pCDB = AliCDBManager::Instance();
82 3 : if(!pCDB) {
83 0 : AliWarning("No Nmean C6F14 from OCDB. Default is taken from ctor.");
84 : } else {
85 9 : AliCDBEntry *pNmeanEnt =pCDB->Get("HMPID/Calib/Nmean"); //contains TObjArray of 42 TF1 + 1 EPhotMean
86 3 : if(!pNmeanEnt) {
87 0 : AliWarning("No Nmean C6F14 from OCDB. Default is taken from ctor.");
88 : } else {
89 3 : TObjArray *pNmean = (TObjArray*)pNmeanEnt->GetObject();
90 6 : if(pNmean->GetEntries()==43) { //for backward compatibility
91 3 : Double_t tmin,tmax;
92 6 : ((TF1*)pNmean->At(42))->GetRange(tmin,tmax);
93 9 : fPhotEMean = ((TF1*)pNmean->At(42))->Eval(tmin); //photon eMean from OCDB
94 9 : AliInfo(Form("EPhotMean = %f eV successfully loaded from OCDB",fPhotEMean));
95 3 : } else {
96 0 : AliWarning("For backward compatibility EPhotMean is taken from ctor.");
97 : }
98 : }
99 : }
100 :
101 6 : fRefIdx = MeanIdxRad(); //initialization of the running ref. index of freon
102 :
103 : Float_t dead=2.6;// cm of the dead zones between PCs-> See 2CRC2099P1
104 :
105 :
106 3 : if(noGeo==kTRUE) fgInstanceType=kFALSE; //instance from ideal geometry, no actual geom is present
107 :
108 3 : if(noGeo==kFALSE && !gGeoManager)
109 : {
110 0 : TGeoManager::Import("geometry.root");
111 0 : if(!gGeoManager) AliFatal("!!!!!!No geometry loaded!!!!!!!");
112 : }
113 :
114 3 : fgCellX=0.8;fgCellY=0.84;
115 :
116 3 : if(!noGeo==kTRUE){
117 3 : TGeoVolume *pCellVol = gGeoManager->GetVolume("Hcel");
118 3 : if(pCellVol) {
119 0 : TGeoBBox *bcell = (TGeoBBox *)pCellVol->GetShape();
120 0 : fgCellX=2.*bcell->GetDX(); fgCellY = 2.*bcell->GetDY(); // overwrite the values with the read ones
121 0 : }
122 3 : }
123 3 : fgPcX=80.*fgCellX; fgPcY = 48.*fgCellY;
124 3 : fgAllX=2.*fgPcX+dead;
125 3 : fgAllY=3.*fgPcY+2.*dead;
126 :
127 3 : fgkMinPcX[1]=fgPcX+dead; fgkMinPcX[3]=fgkMinPcX[1]; fgkMinPcX[5]=fgkMinPcX[3];
128 3 : fgkMaxPcX[0]=fgPcX; fgkMaxPcX[2]=fgkMaxPcX[0]; fgkMaxPcX[4]=fgkMaxPcX[2];
129 3 : fgkMaxPcX[1]=fgAllX; fgkMaxPcX[3]=fgkMaxPcX[1]; fgkMaxPcX[5]=fgkMaxPcX[3];
130 :
131 3 : fgkMinPcY[2]=fgPcY+dead; fgkMinPcY[3]=fgkMinPcY[2];
132 3 : fgkMinPcY[4]=2.*fgPcY+2.*dead; fgkMinPcY[5]=fgkMinPcY[4];
133 3 : fgkMaxPcY[0]=fgPcY; fgkMaxPcY[1]=fgkMaxPcY[0];
134 3 : fgkMaxPcY[2]=2.*fgPcY+dead; fgkMaxPcY[3]=fgkMaxPcY[2];
135 3 : fgkMaxPcY[4]=fgAllY; fgkMaxPcY[5]=fgkMaxPcY[4];
136 :
137 3 : fX=0.5*SizeAllX();
138 3 : fY=0.5*SizeAllY();
139 :
140 :
141 48 : for(Int_t ich=kMinCh;ich<=kMaxCh;ich++) {
142 6762 : for(Int_t padx=0;padx<160;padx++) {
143 974400 : for(Int_t pady=0;pady<144;pady++) {
144 483840 : fgMapPad[padx][pady][ich] = kTRUE; //init all the pads are active at the beginning....
145 : }
146 : }
147 : }
148 :
149 :
150 48 : for(Int_t i=kMinCh;i<=kMaxCh;i++)
151 42 : if(gGeoManager && gGeoManager->IsClosed()) {
152 42 : TGeoPNEntry* pne = gGeoManager->GetAlignableEntry(Form("/HMPID/Chamber%i",i));
153 21 : if (!pne) {
154 0 : AliErrorClass(Form("The symbolic volume %s does not correspond to any physical entry!",Form("HMPID_%i",i)));
155 0 : fM[i]=new TGeoHMatrix;
156 0 : IdealPosition(i,fM[i]);
157 : } else {
158 21 : TGeoPhysicalNode *pnode = pne->GetPhysicalNode();
159 105 : if(pnode) fM[i]=new TGeoHMatrix(*(pnode->GetMatrix()));
160 : else {
161 0 : fM[i]=new TGeoHMatrix;
162 0 : IdealPosition(i,fM[i]);
163 : }
164 : }
165 21 : } else{
166 0 : fM[i]=new TGeoHMatrix;
167 0 : IdealPosition(i,fM[i]);
168 : }
169 3 : fgInstance=this;
170 6 : }//ctor
171 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
172 : void AliHMPIDParam::Print(Option_t* opt) const
173 : {
174 : // print some usefull (hopefully) info on some internal guts of HMPID parametrisation
175 :
176 0 : for(Int_t i=0;i<7;i++) fM[i]->Print(opt);
177 0 : }//Print()
178 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
179 : void AliHMPIDParam::IdealPosition(Int_t iCh, TGeoHMatrix *pMatrix)
180 : {
181 : // Construct ideal position matrix for a given chamber
182 : // Arguments: iCh- chamber ID; pMatrix- pointer to precreated unity matrix where to store the results
183 : // Returns: none
184 : const Double_t kAngHor=19.5; // horizontal angle between chambers 19.5 grad
185 : const Double_t kAngVer=20; // vertical angle between chambers 20 grad
186 : const Double_t kAngCom=30; // common HMPID rotation with respect to x axis 30 grad
187 : const Double_t kTrans[3]={490,0,0}; // center of the chamber is on window-gap surface
188 0 : pMatrix->RotateY(90); // rotate around y since initial position is in XY plane -> now in YZ plane
189 0 : pMatrix->SetTranslation(kTrans); // now plane in YZ is shifted along x
190 0 : switch(iCh){
191 0 : case 0: pMatrix->RotateY(kAngHor); pMatrix->RotateZ(-kAngVer); break; //right and down
192 0 : case 1: pMatrix->RotateZ(-kAngVer); break; //down
193 0 : case 2: pMatrix->RotateY(kAngHor); break; //right
194 : case 3: break; //no rotation
195 0 : case 4: pMatrix->RotateY(-kAngHor); break; //left
196 0 : case 5: pMatrix->RotateZ(kAngVer); break; //up
197 0 : case 6: pMatrix->RotateY(-kAngHor); pMatrix->RotateZ(kAngVer); break; //left and up
198 : }
199 0 : pMatrix->RotateZ(kAngCom); //apply common rotation in XY plane
200 :
201 0 : }
202 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
203 : Int_t AliHMPIDParam::Stack(Int_t evt,Int_t tid)
204 : {
205 : // Prints some useful info from stack
206 : // Arguments: evt - event number. if not -1 print info only for that event
207 : // tid - track id. if not -1 then print it and all it's mothers if any
208 : // Returns: mother tid of the given tid if any
209 0 : AliRunLoader *pAL=AliRunLoader::Open();
210 0 : if(pAL->LoadHeader()) return -1;
211 0 : if(pAL->LoadKinematics()) return -1;
212 :
213 : Int_t mtid=-1;
214 0 : Int_t iNevt=pAL->GetNumberOfEvents();
215 :
216 0 : for(Int_t iEvt=0;iEvt<iNevt;iEvt++){//events loop
217 0 : if(evt!=-1 && evt!=iEvt) continue; //in case one needs to print the requested event, ignore all others
218 0 : pAL->GetEvent(iEvt);
219 0 : AliStack *pStack=pAL->Stack();
220 0 : if(tid==-1){ //print all tids for this event
221 0 : for(Int_t i=0;i<pStack->GetNtrack();i++) pStack->Particle(i)->Print();
222 0 : Printf("totally %i tracks including %i primaries for event %i out of %i event(s)",
223 0 : pStack->GetNtrack(),pStack->GetNprimary(),iEvt,iNevt);
224 0 : }else{ //print only this tid and it;s mothers
225 0 : if(tid<0 || tid>pStack->GetNtrack()) {Printf("Wrong tid, valid tid range for event %i is 0-%i",iEvt,pStack->GetNtrack());break;}
226 0 : TParticle *pTrack=pStack->Particle(tid); mtid=pTrack->GetFirstMother();
227 0 : TString str=pTrack->GetName();
228 0 : while((tid=pTrack->GetFirstMother()) >= 0){
229 0 : pTrack=pStack->Particle(tid);
230 0 : str+=" from ";str+=pTrack->GetName();
231 : }
232 0 : }//if(tid==-1)
233 0 : }//events loop
234 0 : pAL->UnloadHeader(); pAL->UnloadKinematics();
235 : return mtid;
236 0 : }
237 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
238 : Int_t AliHMPIDParam::StackCount(Int_t pid,Int_t evt)
239 : {
240 : // Counts total number of particles of given sort (including secondary) for a given event
241 0 : AliRunLoader *pAL=AliRunLoader::Open();
242 0 : pAL->GetEvent(evt);
243 0 : if(pAL->LoadHeader()) return 0;
244 0 : if(pAL->LoadKinematics()) return 0;
245 0 : AliStack *pStack=pAL->Stack();
246 :
247 : Int_t iCnt=0;
248 0 : for(Int_t i=0;i<pStack->GetNtrack();i++) if(pStack->Particle(i)->GetPdgCode()==pid) iCnt++;
249 :
250 0 : pAL->UnloadHeader(); pAL->UnloadKinematics();
251 : return iCnt;
252 0 : }
253 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
254 : Double_t AliHMPIDParam::Sigma2(Double_t trkTheta,Double_t trkPhi,Double_t ckovTh, Double_t ckovPh)
255 : {
256 : // Analithical calculation of total error (as a sum of localization, geometrical and chromatic errors) on Cerenkov angle for a given Cerenkov photon
257 : // created by a given MIP. Fromulae according to CERN-EP-2000-058
258 : // Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
259 : // dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
260 : // MIP beta
261 : // Returns: absolute error on Cerenkov angle, [radians]
262 :
263 11032 : TVector3 v(-999,-999,-999);
264 5516 : Double_t trkBeta = 1./(TMath::Cos(ckovTh)*GetRefIdx());
265 :
266 6963 : if(trkBeta > 1) trkBeta = 1; //protection against bad measured thetaCer
267 5516 : if(trkBeta < 0) trkBeta = 0.0001; //
268 :
269 11032 : v.SetX(SigLoc (trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
270 11032 : v.SetY(SigGeom(trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
271 11032 : v.SetZ(SigCrom(trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
272 :
273 5516 : return v.Mag2();
274 5516 : }
275 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
276 : Double_t AliHMPIDParam::SigLoc(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
277 : {
278 : // Analitical calculation of localization error (due to finite segmentation of PC) on Cerenkov angle for a given Cerenkov photon
279 : // created by a given MIP. Fromulae according to CERN-EP-2000-058
280 : // Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
281 : // dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
282 : // MIP beta
283 : // Returns: absolute error on Cerenkov angle, [radians]
284 :
285 11032 : Double_t phiDelta = phiC - trkPhi;
286 :
287 5516 : Double_t sint = TMath::Sin(trkTheta);
288 5516 : Double_t cost = TMath::Cos(trkTheta);
289 5516 : Double_t sinf = TMath::Sin(trkPhi);
290 5516 : Double_t cosf = TMath::Cos(trkPhi);
291 5516 : Double_t sinfd = TMath::Sin(phiDelta);
292 5516 : Double_t cosfd = TMath::Cos(phiDelta);
293 5516 : Double_t tantheta = TMath::Tan(thetaC);
294 :
295 5516 : Double_t alpha =cost-tantheta*cosfd*sint; // formula (11)
296 5516 : Double_t k = 1.-GetRefIdx()*GetRefIdx()+alpha*alpha/(betaM*betaM); // formula (after 8 in the text)
297 6221 : if (k<0) return 1e10;
298 4811 : Double_t mu =sint*sinf+tantheta*(cost*cosfd*sinf+sinfd*cosf); // formula (10)
299 4811 : Double_t e =sint*cosf+tantheta*(cost*cosfd*cosf-sinfd*sinf); // formula (9)
300 :
301 4811 : Double_t kk = betaM*TMath::Sqrt(k)/(GapThick()*alpha); // formula (6) and (7)
302 4811 : Double_t dtdxc = kk*(k*(cosfd*cosf-cost*sinfd*sinf)-(alpha*mu/(betaM*betaM))*sint*sinfd); // formula (6)
303 4811 : Double_t dtdyc = kk*(k*(cosfd*sinf+cost*sinfd*cosf)+(alpha* e/(betaM*betaM))*sint*sinfd); // formula (7) pag.4
304 :
305 : Double_t errX = 0.2,errY=0.25; //end of page 7
306 4811 : return TMath::Sqrt(errX*errX*dtdxc*dtdxc + errY*errY*dtdyc*dtdyc);
307 5516 : }
308 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
309 : Double_t AliHMPIDParam::SigCrom(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
310 : {
311 : // Analitical calculation of chromatic error (due to lack of knowledge of Cerenkov photon energy) on Cerenkov angle for a given Cerenkov photon
312 : // created by a given MIP. Fromulae according to CERN-EP-2000-058
313 : // Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
314 : // dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
315 : // MIP beta
316 : // Returns: absolute error on Cerenkov angle, [radians]
317 :
318 11032 : Double_t phiDelta = phiC - trkPhi;
319 :
320 5516 : Double_t sint = TMath::Sin(trkTheta);
321 5516 : Double_t cost = TMath::Cos(trkTheta);
322 5516 : Double_t cosfd = TMath::Cos(phiDelta);
323 5516 : Double_t tantheta = TMath::Tan(thetaC);
324 :
325 5516 : Double_t alpha =cost-tantheta*cosfd*sint; // formula (11)
326 5516 : Double_t dtdn = cost*GetRefIdx()*betaM*betaM/(alpha*tantheta); // formula (12)
327 :
328 : // Double_t f = 0.00928*(7.75-5.635)/TMath::Sqrt(12.);
329 5516 : Double_t f = 0.0172*(7.75-5.635)/TMath::Sqrt(24.);
330 :
331 5516 : return f*dtdn;
332 : }//SigCrom()
333 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
334 : Double_t AliHMPIDParam::SigGeom(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
335 : {
336 : // Analitical calculation of geometric error (due to lack of knowledge of creation point in radiator) on Cerenkov angle for a given Cerenkov photon
337 : // created by a given MIP. Formulae according to CERN-EP-2000-058
338 : // Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
339 : // dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
340 : // MIP beta
341 : // Returns: absolute error on Cerenkov angle, [radians]
342 :
343 11032 : Double_t phiDelta = phiC - trkPhi;
344 :
345 5516 : Double_t sint = TMath::Sin(trkTheta);
346 5516 : Double_t cost = TMath::Cos(trkTheta);
347 5516 : Double_t sinf = TMath::Sin(trkPhi);
348 5516 : Double_t cosfd = TMath::Cos(phiDelta);
349 5516 : Double_t costheta = TMath::Cos(thetaC);
350 5516 : Double_t tantheta = TMath::Tan(thetaC);
351 :
352 5516 : Double_t alpha =cost-tantheta*cosfd*sint; // formula (11)
353 :
354 5516 : Double_t k = 1.-GetRefIdx()*GetRefIdx()+alpha*alpha/(betaM*betaM); // formula (after 8 in the text)
355 6221 : if (k<0) return 1e10;
356 :
357 4811 : Double_t eTr = 0.5*RadThick()*betaM*TMath::Sqrt(k)/(GapThick()*alpha); // formula (14)
358 4811 : Double_t lambda = (1.-sint*sinf)*(1.+sint*sinf); // formula (15)
359 :
360 4811 : Double_t c1 = 1./(1.+ eTr*k/(alpha*alpha*costheta*costheta)); // formula (13.a)
361 4811 : Double_t c2 = betaM*TMath::Power(k,1.5)*tantheta*lambda/(GapThick()*alpha*alpha); // formula (13.b)
362 4811 : Double_t c3 = (1.+eTr*k*betaM*betaM)/((1+eTr)*alpha*alpha); // formula (13.c)
363 4811 : Double_t c4 = TMath::Sqrt(k)*tantheta*(1-lambda)/(GapThick()*betaM); // formula (13.d)
364 4811 : Double_t dtdT = c1 * (c2+c3*c4);
365 4811 : Double_t trErr = RadThick()/(TMath::Sqrt(12.)*cost);
366 :
367 4811 : return trErr*dtdT;
368 5516 : }//SigGeom()
369 : //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
370 : Double_t AliHMPIDParam::SigmaCorrFact (Int_t iPart, Double_t occupancy)
371 : {
372 : Double_t corr = 1.0;
373 :
374 108 : switch(iPart) {
375 8 : case 0: corr = 0.115*occupancy + 1.166; break;
376 8 : case 1: corr = 0.115*occupancy + 1.166; break;
377 8 : case 2: corr = 0.115*occupancy + 1.166; break;
378 8 : case 3: corr = 0.065*occupancy + 1.137; break;
379 4 : case 4: corr = 0.048*occupancy + 1.202; break;
380 : }
381 :
382 36 : return corr;
383 : }
384 :
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