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 : // Pythia 6 interface used by AliGenPythia
17 : // Some settings are done by AliGenPythia, others here :)
18 : //
19 : /* $Id$ */
20 :
21 : #include "AliPythia.h"
22 : #include "AliPythiaRndm.h"
23 : #include "AliFastGlauber.h"
24 : #include "AliQuenchingWeights.h"
25 : #include "AliOmegaDalitz.h"
26 : #include "AliDecayerExodus.h"
27 : #include "AliLog.h"
28 : #include "TVector3.h"
29 : #include "TLorentzVector.h"
30 : #include "PyquenCommon.h"
31 :
32 2 : ClassImp(AliPythia)
33 :
34 : #ifndef WIN32
35 : # define pyclus pyclus_
36 : # define pycell pycell_
37 : # define pyshow pyshow_
38 : # define pyrobo pyrobo_
39 : # define pyquen pyquen_
40 : # define pyevnw pyevnw_
41 : # define pyshowq pyshowq_
42 : # define qpygin0 qpygin0_
43 : # define pytune pytune_
44 : # define py2ent py2ent_
45 : # define setpowwght setpowwght_
46 : # define type_of_call
47 : #else
48 : # define pyclus PYCLUS
49 : # define pycell PYCELL
50 : # define pyrobo PYROBO
51 : # define pyquen PYQUEN
52 : # define pyevnw PYEVNW
53 : # define pyshowq PYSHOWQ
54 : # define qpygin0 QPYGIN0
55 : # define pytune PYTUNE
56 : # define py2ent PY2ENT
57 : # define setpowwght SETPOWWGHT
58 : # define type_of_call _stdcall
59 : #endif
60 :
61 : extern "C" void type_of_call pyclus(Int_t & );
62 : extern "C" void type_of_call pycell(Int_t & );
63 : extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
64 : extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
65 : extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
66 : extern "C" void type_of_call pyevnw();
67 : extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &);
68 : extern "C" void type_of_call pytune(Int_t &);
69 : extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&);
70 : extern "C" void type_of_call qpygin0();
71 : extern "C" void type_of_call setpowwght(Double_t &);
72 : //_____________________________________________________________________________
73 :
74 : AliPythia* AliPythia::fgAliPythia=NULL;
75 :
76 2 : AliPythia::AliPythia():
77 1 : fProcess(kPyMb),
78 1 : fEcms(0.),
79 1 : fStrucFunc(kCTEQ5L),
80 1 : fProjectile("p"),
81 1 : fTarget("p"),
82 1 : fXJet(0.),
83 1 : fYJet(0.),
84 1 : fNGmax(30),
85 1 : fZmax(0.97),
86 1 : fGlauber(0),
87 1 : fQuenchingWeights(0),
88 1 : fItune(-1),
89 1 : fOmegaDalitz(),
90 1 : fExodus()
91 6 : {
92 : // Default Constructor
93 : //
94 : // Set random number
95 2 : if (!AliPythiaRndm::GetPythiaRandom())
96 0 : AliPythiaRndm::SetPythiaRandom(GetRandom());
97 1 : fGlauber = 0;
98 1 : fQuenchingWeights = 0;
99 : Int_t i = 0;
100 1004 : for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
101 4004 : for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
102 10 : for (i = 0; i < 4; i++) fZQuench[i] = 0;
103 2 : }
104 :
105 : AliPythia::AliPythia(const AliPythia& pythia):
106 0 : TPythia6(pythia),
107 0 : AliRndm(pythia),
108 0 : fProcess(kPyMb),
109 0 : fEcms(0.),
110 0 : fStrucFunc(kCTEQ5L),
111 0 : fProjectile("p"),
112 0 : fTarget("p"),
113 0 : fXJet(0.),
114 0 : fYJet(0.),
115 0 : fNGmax(30),
116 0 : fZmax(0.97),
117 0 : fGlauber(0),
118 0 : fQuenchingWeights(0),
119 0 : fItune(-1),
120 0 : fOmegaDalitz(),
121 0 : fExodus()
122 0 : {
123 : // Copy Constructor
124 : Int_t i;
125 0 : for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
126 0 : for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
127 0 : for (i = 0; i < 4; i++) fZQuench[i] = 0;
128 0 : pythia.Copy(*this);
129 0 : }
130 :
131 : void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune)
132 : {
133 : // Initialise the process to generate
134 0 : if (!AliPythiaRndm::GetPythiaRandom())
135 0 : AliPythiaRndm::SetPythiaRandom(GetRandom());
136 :
137 0 : fItune = itune;
138 :
139 0 : fProcess = process;
140 0 : fEcms = energy;
141 0 : fStrucFunc = strucfunc;
142 : //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
143 0 : SetMDCY(Pycomp(111) ,1,0); // pi0
144 0 : SetMDCY(Pycomp(310) ,1,0); // K0S
145 0 : SetMDCY(Pycomp(3122),1,0); // kLambda
146 0 : SetMDCY(Pycomp(3112),1,0); // sigma -
147 0 : SetMDCY(Pycomp(3222),1,0); // sigma +
148 0 : SetMDCY(Pycomp(3312),1,0); // xi -
149 0 : SetMDCY(Pycomp(3322),1,0); // xi 0
150 0 : SetMDCY(Pycomp(3334),1,0); // omega-
151 : // Select structure function
152 0 : SetMSTP(52,2);
153 0 : SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
154 : // Particles produced in string fragmentation point directly to either of the two endpoints
155 : // of the string (depending in the side they were generated from).
156 0 : SetMSTU(16,2);
157 :
158 : //
159 : // Pythia initialisation for selected processes//
160 : //
161 : // Make MSEL clean
162 : //
163 0 : for (Int_t i=1; i<= 200; i++) {
164 0 : SetMSUB(i,0);
165 : }
166 : // select charm production
167 0 : switch (process)
168 : {
169 : case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
170 : // Multiple interactions on.
171 0 : SetMSTP(81,1);
172 : // Double Gaussian matter distribution.
173 0 : SetMSTP(82,4);
174 0 : SetPARP(83,0.5);
175 0 : SetPARP(84,0.4);
176 : // pT0.
177 0 : SetPARP(82,2.0);
178 : // Reference energy for pT0 and energy rescaling pace.
179 0 : SetPARP(89,1800);
180 0 : SetPARP(90,0.25);
181 : // String drawing almost completely minimizes string length.
182 0 : SetPARP(85,0.9);
183 0 : SetPARP(86,0.95);
184 : // ISR and FSR activity.
185 0 : SetPARP(67,4);
186 0 : SetPARP(71,4);
187 : // Lambda_FSR scale.
188 0 : SetPARJ(81,0.29);
189 0 : break;
190 : case kPyOldUEQ2ordered2:
191 : // Old underlying events with Q2 ordered QCD processes
192 : // Multiple interactions on.
193 0 : SetMSTP(81,1);
194 : // Double Gaussian matter distribution.
195 0 : SetMSTP(82,4);
196 0 : SetPARP(83,0.5);
197 0 : SetPARP(84,0.4);
198 : // pT0.
199 0 : SetPARP(82,2.0);
200 : // Reference energy for pT0 and energy rescaling pace.
201 0 : SetPARP(89,1800);
202 0 : SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
203 : // String drawing almost completely minimizes string length.
204 0 : SetPARP(85,0.9);
205 0 : SetPARP(86,0.95);
206 : // ISR and FSR activity.
207 0 : SetPARP(67,4);
208 0 : SetPARP(71,4);
209 : // Lambda_FSR scale.
210 0 : SetPARJ(81,0.29);
211 0 : break;
212 : case kPyOldPopcorn:
213 : // Old production mechanism: Old Popcorn
214 0 : SetMSEL(1);
215 0 : SetMSTJ(12,3);
216 : // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
217 0 : SetMSTP(88,2);
218 : // (D=1)see can be used to form baryons (BARYON JUNCTION)
219 0 : SetMSTJ(1,1);
220 0 : AtlasTuning();
221 0 : break;
222 : case kPyCharm:
223 0 : SetMSEL(4);
224 : // heavy quark masses
225 :
226 0 : SetPMAS(4,1,1.2);
227 : //
228 : // primordial pT
229 0 : SetMSTP(91,1);
230 0 : SetPARP(91,1.);
231 0 : SetPARP(93,5.);
232 : //
233 0 : break;
234 : case kPyBeauty:
235 0 : SetMSEL(5);
236 0 : SetPMAS(5,1,4.75);
237 0 : break;
238 : case kPyJpsi:
239 0 : SetMSEL(0);
240 : // gg->J/Psi g
241 0 : SetMSUB(86,1);
242 0 : break;
243 : case kPyJpsiChi:
244 0 : SetMSEL(0);
245 : // gg->J/Psi g
246 0 : SetMSUB(86,1);
247 : // gg-> chi_0c g
248 0 : SetMSUB(87,1);
249 : // gg-> chi_1c g
250 0 : SetMSUB(88,1);
251 : // gg-> chi_2c g
252 0 : SetMSUB(89,1);
253 0 : break;
254 : case kPyCharmUnforced:
255 0 : SetMSEL(0);
256 : // gq->qg
257 0 : SetMSUB(28,1);
258 : // gg->qq
259 0 : SetMSUB(53,1);
260 : // gg->gg
261 0 : SetMSUB(68,1);
262 0 : break;
263 : case kPyBeautyUnforced:
264 0 : SetMSEL(0);
265 : // gq->qg
266 0 : SetMSUB(28,1);
267 : // gg->qq
268 0 : SetMSUB(53,1);
269 : // gg->gg
270 0 : SetMSUB(68,1);
271 0 : break;
272 : case kPyMb:
273 : // Minimum Bias pp-Collisions
274 : //
275 : //
276 : // select Pythia min. bias model
277 0 : SetMSEL(0);
278 0 : SetMSUB(92,1); // single diffraction AB-->XB
279 0 : SetMSUB(93,1); // single diffraction AB-->AX
280 0 : SetMSUB(94,1); // double diffraction
281 0 : SetMSUB(95,1); // low pt production
282 :
283 0 : AtlasTuning();
284 0 : break;
285 :
286 : case kPyMbAtlasTuneMC09:
287 : // Minimum Bias pp-Collisions
288 : //
289 : //
290 : // select Pythia min. bias model
291 0 : SetMSEL(0);
292 0 : SetMSUB(92,1); // single diffraction AB-->XB
293 0 : SetMSUB(93,1); // single diffraction AB-->AX
294 0 : SetMSUB(94,1); // double diffraction
295 0 : SetMSUB(95,1); // low pt production
296 :
297 0 : AtlasTuningMC09();
298 0 : break;
299 :
300 : case kPyMbWithDirectPhoton:
301 : // Minimum Bias pp-Collisions with direct photon processes added
302 : //
303 : //
304 : // select Pythia min. bias model
305 0 : SetMSEL(0);
306 0 : SetMSUB(92,1); // single diffraction AB-->XB
307 0 : SetMSUB(93,1); // single diffraction AB-->AX
308 0 : SetMSUB(94,1); // double diffraction
309 0 : SetMSUB(95,1); // low pt production
310 :
311 0 : SetMSUB(14,1); //
312 0 : SetMSUB(18,1); //
313 0 : SetMSUB(29,1); //
314 0 : SetMSUB(114,1); //
315 0 : SetMSUB(115,1); //
316 :
317 :
318 0 : AtlasTuning();
319 0 : break;
320 :
321 : case kPyMbDefault:
322 : // Minimum Bias pp-Collisions
323 : //
324 : //
325 : // select Pythia min. bias model
326 0 : SetMSEL(0);
327 0 : SetMSUB(92,1); // single diffraction AB-->XB
328 0 : SetMSUB(93,1); // single diffraction AB-->AX
329 0 : SetMSUB(94,1); // double diffraction
330 0 : SetMSUB(95,1); // low pt production
331 0 : break;
332 : case kPyLhwgMb:
333 : // Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
334 : // -> Pythia 6.3 or above is needed
335 : //
336 0 : SetMSEL(0);
337 0 : SetMSUB(92,1); // single diffraction AB-->XB
338 0 : SetMSUB(93,1); // single diffraction AB-->AX
339 0 : SetMSUB(94,1); // double diffraction
340 0 : SetMSUB(95,1); // low pt production
341 :
342 0 : SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf
343 0 : SetMSTP(52,2);
344 0 : SetMSTP(68,1);
345 0 : SetMSTP(70,2);
346 0 : SetMSTP(81,1); // Multiple Interactions ON
347 0 : SetMSTP(82,4); // Double Gaussian Model
348 0 : SetMSTP(88,1);
349 :
350 0 : SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
351 0 : SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
352 0 : SetPARP(84,0.5); // Core radius
353 0 : SetPARP(85,0.9); // Regulates gluon prod. mechanism
354 0 : SetPARP(90,0.2); // 2*epsilon (exponent in power law)
355 :
356 0 : break;
357 : case kPyMbNonDiffr:
358 : // Minimum Bias pp-Collisions
359 : //
360 : //
361 : // select Pythia min. bias model
362 0 : SetMSEL(0);
363 0 : SetMSUB(95,1); // low pt production
364 :
365 0 : AtlasTuning();
366 0 : break;
367 : case kPyMbMSEL1:
368 0 : ConfigHeavyFlavor();
369 : // Intrinsic <kT^2>
370 0 : SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
371 0 : SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
372 0 : SetPARP(93,5.); // Upper cut-off
373 : // Set Q-quark mass
374 0 : SetPMAS(4,1,1.2); // Charm quark mass
375 0 : SetPMAS(5,1,4.78); // Beauty quark mass
376 0 : SetPARP(71,4.); // Defaut value
377 : // Atlas Tuning
378 0 : AtlasTuning();
379 0 : break;
380 : case kPyJets:
381 : //
382 : // QCD Jets
383 : //
384 0 : SetMSEL(1);
385 :
386 : // Pythia Tune A (CDF)
387 : //
388 0 : if (fItune < 0) {
389 0 : SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
390 0 : SetMSTP(82,4); // Double Gaussian Model
391 0 : SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
392 0 : SetPARP(84,0.4); // Core radius
393 0 : SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
394 0 : SetPARP(86,0.95); // Regulates gluon prod. mechanism
395 0 : SetPARP(89,1800.); // [GeV] Ref. energy
396 0 : SetPARP(90,0.25); // 2*epsilon (exponent in power law)
397 0 : }
398 : break;
399 : case kPyDirectGamma:
400 0 : SetMSEL(10);
401 0 : break;
402 : case kPyCharmPbPbMNR:
403 : case kPyD0PbPbMNR:
404 : case kPyDPlusPbPbMNR:
405 : case kPyDPlusStrangePbPbMNR:
406 : // Tuning of Pythia parameters aimed to get a resonable agreement
407 : // between with the NLO calculation by Mangano, Nason, Ridolfi for the
408 : // c-cbar single inclusive and double differential distributions.
409 : // This parameter settings are meant to work with Pb-Pb collisions
410 : // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
411 : // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
412 : // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
413 0 : ConfigHeavyFlavor();
414 : // Intrinsic <kT>
415 0 : SetMSTP(91,1);
416 0 : SetPARP(91,1.304);
417 0 : SetPARP(93,6.52);
418 : // Set c-quark mass
419 0 : SetPMAS(4,1,1.2);
420 0 : break;
421 : case kPyCharmpPbMNR:
422 : case kPyD0pPbMNR:
423 : case kPyDPluspPbMNR:
424 : case kPyDPlusStrangepPbMNR:
425 : // Tuning of Pythia parameters aimed to get a resonable agreement
426 : // between with the NLO calculation by Mangano, Nason, Ridolfi for the
427 : // c-cbar single inclusive and double differential distributions.
428 : // This parameter settings are meant to work with p-Pb collisions
429 : // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
430 : // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
431 : // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
432 0 : ConfigHeavyFlavor();
433 : // Intrinsic <kT>
434 0 : SetMSTP(91,1);
435 0 : SetPARP(91,1.16);
436 0 : SetPARP(93,5.8);
437 :
438 : // Set c-quark mass
439 0 : SetPMAS(4,1,1.2);
440 0 : break;
441 : case kPyCharmppMNR:
442 : case kPyD0ppMNR:
443 : case kPyDPlusppMNR:
444 : case kPyDPlusStrangeppMNR:
445 : case kPyLambdacppMNR:
446 : // Tuning of Pythia parameters aimed to get a resonable agreement
447 : // between with the NLO calculation by Mangano, Nason, Ridolfi for the
448 : // c-cbar single inclusive and double differential distributions.
449 : // This parameter settings are meant to work with pp collisions
450 : // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
451 : // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
452 : // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
453 0 : ConfigHeavyFlavor();
454 : // Intrinsic <kT^2>
455 0 : SetMSTP(91,1);
456 0 : SetPARP(91,1.);
457 0 : SetPARP(93,5.);
458 :
459 : // Set c-quark mass
460 0 : SetPMAS(4,1,1.2);
461 0 : break;
462 : case kPyCharmppMNRwmi:
463 : // Tuning of Pythia parameters aimed to get a resonable agreement
464 : // between with the NLO calculation by Mangano, Nason, Ridolfi for the
465 : // c-cbar single inclusive and double differential distributions.
466 : // This parameter settings are meant to work with pp collisions
467 : // and with kCTEQ5L PDFs.
468 : // Added multiple interactions according to ATLAS tune settings.
469 : // To get a "reasonable" agreement with MNR results, events have to be
470 : // generated with the minimum ptHard (AliGenPythia::SetPtHard)
471 : // set to 2.76 GeV.
472 : // To get a "perfect" agreement with MNR results, events have to be
473 : // generated in four ptHard bins with the following relative
474 : // normalizations:
475 : // 2.76-3 GeV: 25%
476 : // 3-4 GeV: 40%
477 : // 4-8 GeV: 29%
478 : // >8 GeV: 6%
479 0 : ConfigHeavyFlavor();
480 : // Intrinsic <kT^2>
481 0 : SetMSTP(91,1);
482 0 : SetPARP(91,1.);
483 0 : SetPARP(93,5.);
484 :
485 : // Set c-quark mass
486 0 : SetPMAS(4,1,1.2);
487 0 : AtlasTuning();
488 0 : break;
489 : case kPyBeautyPbPbMNR:
490 : // Tuning of Pythia parameters aimed to get a resonable agreement
491 : // between with the NLO calculation by Mangano, Nason, Ridolfi for the
492 : // b-bbar single inclusive and double differential distributions.
493 : // This parameter settings are meant to work with Pb-Pb collisions
494 : // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
495 : // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
496 : // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
497 0 : ConfigHeavyFlavor();
498 : // QCD scales
499 0 : SetPARP(67,1.0);
500 0 : SetPARP(71,1.0);
501 : // Intrinsic <kT>
502 0 : SetMSTP(91,1);
503 0 : SetPARP(91,2.035);
504 0 : SetPARP(93,10.17);
505 : // Set b-quark mass
506 0 : SetPMAS(5,1,4.75);
507 0 : break;
508 : case kPyBeautypPbMNR:
509 : // Tuning of Pythia parameters aimed to get a resonable agreement
510 : // between with the NLO calculation by Mangano, Nason, Ridolfi for the
511 : // b-bbar single inclusive and double differential distributions.
512 : // This parameter settings are meant to work with p-Pb collisions
513 : // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
514 : // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
515 : // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
516 0 : ConfigHeavyFlavor();
517 : // QCD scales
518 0 : SetPARP(67,1.0);
519 0 : SetPARP(71,1.0);
520 : // Intrinsic <kT>
521 0 : SetMSTP(91,1);
522 0 : SetPARP(91,1.60);
523 0 : SetPARP(93,8.00);
524 : // Set b-quark mass
525 0 : SetPMAS(5,1,4.75);
526 0 : break;
527 : case kPyBeautyppMNR:
528 : // Tuning of Pythia parameters aimed to get a resonable agreement
529 : // between with the NLO calculation by Mangano, Nason, Ridolfi for the
530 : // b-bbar single inclusive and double differential distributions.
531 : // This parameter settings are meant to work with pp collisions
532 : // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
533 : // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
534 : // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
535 0 : ConfigHeavyFlavor();
536 : // QCD scales
537 0 : SetPARP(67,1.0);
538 0 : SetPARP(71,1.0);
539 :
540 : // Intrinsic <kT>
541 0 : SetMSTP(91,1);
542 0 : SetPARP(91,1.);
543 0 : SetPARP(93,5.);
544 :
545 : // Set b-quark mass
546 0 : SetPMAS(5,1,4.75);
547 0 : break;
548 : case kPyBeautyJets:
549 : case kPyBeautyppMNRwmi:
550 : // Tuning of Pythia parameters aimed to get a resonable agreement
551 : // between with the NLO calculation by Mangano, Nason, Ridolfi for the
552 : // b-bbar single inclusive and double differential distributions.
553 : // This parameter settings are meant to work with pp collisions
554 : // and with kCTEQ5L PDFs.
555 : // Added multiple interactions according to ATLAS tune settings.
556 : // To get a "reasonable" agreement with MNR results, events have to be
557 : // generated with the minimum ptHard (AliGenPythia::SetPtHard)
558 : // set to 2.76 GeV.
559 : // To get a "perfect" agreement with MNR results, events have to be
560 : // generated in four ptHard bins with the following relative
561 : // normalizations:
562 : // 2.76-4 GeV: 5%
563 : // 4-6 GeV: 31%
564 : // 6-8 GeV: 28%
565 : // >8 GeV: 36%
566 0 : ConfigHeavyFlavor();
567 : // QCD scales
568 0 : SetPARP(67,1.0);
569 0 : SetPARP(71,1.0);
570 :
571 : // Intrinsic <kT>
572 0 : SetMSTP(91,1);
573 0 : SetPARP(91,1.);
574 0 : SetPARP(93,5.);
575 :
576 : // Set b-quark mass
577 0 : SetPMAS(5,1,4.75);
578 :
579 0 : AtlasTuning();
580 0 : break;
581 : case kPyW:
582 :
583 : //Inclusive production of W+/-
584 0 : SetMSEL(0);
585 : //f fbar -> W+
586 0 : SetMSUB(2,1);
587 : // //f fbar -> g W+
588 : // SetMSUB(16,1);
589 : // //f fbar -> gamma W+
590 : // SetMSUB(20,1);
591 : // //f g -> f W+
592 : // SetMSUB(31,1);
593 : // //f gamma -> f W+
594 : // SetMSUB(36,1);
595 :
596 : // Initial/final parton shower on (Pythia default)
597 : // With parton showers on we are generating "W inclusive process"
598 0 : SetMSTP(61,1); //Initial QCD & QED showers on
599 0 : SetMSTP(71,1); //Final QCD & QED showers on
600 :
601 0 : break;
602 :
603 : case kPyZ:
604 :
605 : //Inclusive production of Z
606 0 : SetMSEL(0);
607 : //f fbar -> Z/gamma
608 0 : SetMSUB(1,1);
609 :
610 : // // f fbar -> g Z/gamma
611 : // SetMSUB(15,1);
612 : // // f fbar -> gamma Z/gamma
613 : // SetMSUB(19,1);
614 : // // f g -> f Z/gamma
615 : // SetMSUB(30,1);
616 : // // f gamma -> f Z/gamma
617 : // SetMSUB(35,1);
618 :
619 : //only Z included, not gamma
620 0 : SetMSTP(43,2);
621 :
622 : // Initial/final parton shower on (Pythia default)
623 : // With parton showers on we are generating "Z inclusive process"
624 0 : SetMSTP(61,1); //Initial QCD & QED showers on
625 0 : SetMSTP(71,1); //Final QCD & QED showers on
626 :
627 0 : break;
628 : case kPyZgamma:
629 : //Inclusive production of Z
630 0 : SetMSEL(0);
631 : //f fbar -> Z/gamma
632 0 : SetMSUB(1,1);
633 : // Initial/final parton shower on (Pythia default)
634 : // With parton showers on we are generating "Z inclusive process"
635 0 : SetMSTP(61,1); //Initial QCD & QED showers on
636 0 : SetMSTP(71,1); //Final QCD & QED showers on
637 0 : break;
638 : case kPyMBRSingleDiffraction:
639 : case kPyMBRDoubleDiffraction:
640 : case kPyMBRCentralDiffraction:
641 : break;
642 : case kPyJetsPWHG:
643 : // N.B.
644 : // ====
645 : // For the case of jet production the following parameter setting
646 : // limits the transverse momentum of secondary scatterings, due
647 : // to multiple parton interactions, to be less than that of the
648 : // primary interaction (see POWHEG Dijet paper arXiv:1012.3380
649 : // [hep-ph] sec. 4.1 and also the PYTHIA Manual).
650 0 : SetMSTP(86,1);
651 :
652 : // maximum number of errors before pythia aborts (def=10)
653 0 : SetMSTU(22,10);
654 : // number of warnings printed on the shell
655 0 : SetMSTU(26,20);
656 0 : break;
657 :
658 : case kPyCharmPWHG:
659 : case kPyBeautyPWHG:
660 : case kPyWPWHG:
661 : // number of warnings printed on the shell
662 0 : SetMSTU(26,20);
663 :
664 0 : break;
665 : }
666 : //
667 : // Initialize PYTHIA
668 : //
669 : // Select the tune
670 0 : if (itune > -1) {
671 0 : Pytune(itune);
672 0 : if (GetMSTP(192) > 1 || GetMSTP(193) > 1) {
673 0 : AliWarning(Form("Structure function for tune %5d set to %5s\n",
674 : itune, AliStructFuncType::PDFsetName(strucfunc).Data()));
675 0 : SetMSTP(52,2);
676 0 : SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
677 0 : }
678 : }
679 : //
680 0 : SetMSTP(41,1); // all resonance decays switched on
681 0 : if (process == kPyJetsPWHG || process == kPyCharmPWHG || process == kPyBeautyPWHG || process == kPyWPWHG) {
682 0 : Initialize("USER","","",0.);
683 0 : } else {
684 0 : Initialize("CMS",fProjectile,fTarget,fEcms);
685 : }
686 0 : fOmegaDalitz.Init();
687 0 : fExodus.Init();
688 0 : }
689 :
690 : Int_t AliPythia::CheckedLuComp(Int_t kf)
691 : {
692 : // Check Lund particle code (for debugging)
693 0 : Int_t kc=Pycomp(kf);
694 0 : printf("\n Lucomp kf,kc %d %d",kf,kc);
695 0 : return kc;
696 : }
697 :
698 : void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf)
699 : {
700 : // Treat protons as inside nuclei with mass numbers a1 and a2
701 : // The MSTP array in the PYPARS common block is used to enable and
702 : // select the nuclear structure functions.
703 : // MSTP(52) : (D=1) choice of proton and nuclear structure-function library
704 : // =1: internal PYTHIA acording to MSTP(51)
705 : // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
706 : // If the following mass number both not equal zero, nuclear corrections of the stf are used.
707 : // MSTP(192) : Mass number of nucleus side 1
708 : // MSTP(193) : Mass number of nucleus side 2
709 : // MSTP(194) : Nuclear structure function: 0: EKS98 8:EPS08 9:EPS09LO 19:EPS09NLO
710 0 : SetMSTP(52,2);
711 0 : SetMSTP(192, a1);
712 0 : SetMSTP(193, a2);
713 0 : SetMSTP(194, pdf);
714 0 : }
715 :
716 :
717 : AliPythia* AliPythia::Instance()
718 : {
719 : // Set random number generator
720 2 : if (fgAliPythia) {
721 0 : return fgAliPythia;
722 : } else {
723 2 : fgAliPythia = new AliPythia();
724 1 : return fgAliPythia;
725 : }
726 1 : }
727 :
728 : void AliPythia::PrintParticles()
729 : {
730 : // Print list of particl properties
731 : Int_t np = 0;
732 0 : char* name = new char[16];
733 0 : for (Int_t kf=0; kf<1000000; kf++) {
734 0 : for (Int_t c = 1; c > -2; c-=2) {
735 0 : Int_t kc = Pycomp(c*kf);
736 0 : if (kc) {
737 0 : Float_t mass = GetPMAS(kc,1);
738 0 : Float_t width = GetPMAS(kc,2);
739 0 : Float_t tau = GetPMAS(kc,4);
740 :
741 0 : Pyname(kf,name);
742 :
743 0 : np++;
744 :
745 0 : printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
746 0 : c*kf, name, mass, width, tau);
747 0 : }
748 : }
749 : }
750 0 : printf("\n Number of particles %d \n \n", np);
751 0 : }
752 :
753 : void AliPythia::ResetDecayTable()
754 : {
755 : // Set default values for pythia decay switches
756 : Int_t i;
757 1003 : for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
758 4002 : for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
759 1 : }
760 :
761 : void AliPythia::SetDecayTable()
762 : {
763 : // Set default values for pythia decay switches
764 : //
765 : Int_t i;
766 1003 : for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
767 4002 : for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
768 1 : }
769 :
770 : void AliPythia::Pyclus(Int_t& njet)
771 : {
772 : // Call Pythia clustering algorithm
773 : //
774 0 : pyclus(njet);
775 0 : }
776 :
777 : void AliPythia::Pycell(Int_t& njet)
778 : {
779 : // Call Pythia jet reconstruction algorithm
780 : //
781 0 : pycell(njet);
782 0 : }
783 :
784 : void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
785 : {
786 : // Call Pythia jet reconstruction algorithm
787 : //
788 0 : pyshow(ip1, ip2, qmax);
789 0 : }
790 :
791 : void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
792 : {
793 0 : pyrobo(imi, ima, the, phi, bex, bey, bez);
794 0 : }
795 :
796 : void AliPythia::Pytune(Int_t itune)
797 : {
798 : /*
799 : C
800 : C ITUNE NAME (detailed descriptions below)
801 : C 0 Default : No settings changed => linked Pythia version's defaults.
802 : C ====== Old UE, Q2-ordered showers ==========================================
803 : C 100 A : Rick Field's CDF Tune A
804 : C 101 AW : Rick Field's CDF Tune AW
805 : C 102 BW : Rick Field's CDF Tune BW
806 : C 103 DW : Rick Field's CDF Tune DW
807 : C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling
808 : C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally)
809 : C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome)
810 : C 107 ACR : Tune A modified with annealing CR
811 : C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally)
812 : C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally)
813 : C ====== Intermediate Models =================================================
814 : C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR
815 : C 201 APT : Tune A modified to use pT-ordered final-state showers
816 : C ====== New UE, interleaved pT-ordered showers, annealing CR ================
817 : C 300 S0 : Sandhoff-Skands Tune 0
818 : C 301 S1 : Sandhoff-Skands Tune 1
819 : C 302 S2 : Sandhoff-Skands Tune 2
820 : C 303 S0A : S0 with "Tune A" UE energy scaling
821 : C 304 NOCR : New UE "best try" without colour reconnections
822 : C 305 Old : New UE, original (primitive) colour reconnections
823 : C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally)
824 : C ======= The Uppsala models =================================================
825 : C ( NB! must be run with special modified Pythia 6.215 version )
826 : C ( available from http://www.isv.uu.se/thep/MC/scigal/ )
827 : C 400 GAL 0 : Generalized area-law model. Old parameters
828 : C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters
829 : C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands)
830 : */
831 0 : pytune(itune);
832 0 : }
833 :
834 : void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){
835 : // Inset 2-parton system at line idx
836 0 : py2ent(idx, pdg1, pdg2, p);
837 0 : }
838 :
839 : void AliPythia::SetWeightPower(Double_t pow)
840 : {
841 0 : setpowwght(pow);
842 0 : SetMSTP(142, 1); // Tell Pythia to use pyevwt to calculate event wghts
843 0 : if (GetCKIN(3) <= 0)
844 0 : AliWarning("Need to set minimum p_T,hard to nonzero value for weighted event generation");
845 0 : }
846 :
847 : void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax)
848 : {
849 : // Initializes
850 : // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
851 : // (2) The nuclear geometry using the Glauber Model
852 : //
853 :
854 0 : fGlauber = AliFastGlauber::Instance();
855 0 : fGlauber->Init(2);
856 0 : fGlauber->SetCentralityClass(cMin, cMax);
857 :
858 0 : fQuenchingWeights = new AliQuenchingWeights();
859 0 : fQuenchingWeights->InitMult();
860 0 : fQuenchingWeights->SetK(k);
861 0 : fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
862 0 : fNGmax = ngmax;
863 0 : fZmax = zmax;
864 :
865 0 : }
866 :
867 :
868 : void AliPythia::Quench()
869 : {
870 : //
871 : //
872 : // Simple Jet Quenching routine:
873 : // =============================
874 : // The jet formed by all final state partons radiated by the parton created
875 : // in the hard collisions is quenched by a factor (1-z) using light cone variables in
876 : // the initial parton reference frame:
877 : // (E + p_z)new = (1-z) (E + p_z)old
878 : //
879 : //
880 : //
881 : //
882 : // The lost momentum is first balanced by one gluon with virtuality > 0.
883 : // Subsequently the gluon splits to yield two gluons with E = p.
884 : //
885 : //
886 : //
887 : static Float_t eMean = 0.;
888 : static Int_t icall = 0;
889 :
890 0 : Double_t p0[4][5];
891 0 : Double_t p1[4][5];
892 0 : Double_t p2[4][5];
893 0 : Int_t klast[4] = {-1, -1, -1, -1};
894 :
895 0 : Int_t numpart = fPyjets->N;
896 : Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
897 0 : Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
898 0 : Bool_t quenched[4];
899 0 : Double_t wjtKick[4] = {0., 0., 0., 0.};
900 0 : Int_t nGluon[4];
901 0 : Int_t qPdg[4];
902 : Int_t imo, kst, pdg;
903 :
904 : //
905 : // Sore information about Primary partons
906 : //
907 : // j =
908 : // 0, 1 partons from hard scattering
909 : // 2, 3 partons from initial state radiation
910 : //
911 0 : for (Int_t i = 2; i <= 7; i++) {
912 : Int_t j = 0;
913 : // Skip gluons that participate in hard scattering
914 0 : if (i == 4 || i == 5) continue;
915 : // Gluons from hard Scattering
916 0 : if (i == 6 || i == 7) {
917 0 : j = i - 6;
918 0 : pxq[j] = fPyjets->P[0][i];
919 0 : pyq[j] = fPyjets->P[1][i];
920 0 : pzq[j] = fPyjets->P[2][i];
921 0 : eq[j] = fPyjets->P[3][i];
922 0 : mq[j] = fPyjets->P[4][i];
923 0 : } else {
924 : // Gluons from initial state radiation
925 : //
926 : // Obtain 4-momentum vector from difference between original parton and parton after gluon
927 : // radiation. Energy is calculated independently because initial state radition does not
928 : // conserve strictly momentum and energy for each partonic system independently.
929 : //
930 : // Not very clean. Should be improved !
931 : //
932 : //
933 : j = i;
934 0 : pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
935 0 : pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
936 0 : pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
937 0 : mq[j] = fPyjets->P[4][i];
938 0 : eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
939 : }
940 : //
941 : // Calculate some kinematic variables
942 : //
943 0 : yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
944 0 : pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
945 0 : phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
946 0 : ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
947 0 : thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
948 0 : qPdg[j] = fPyjets->K[1][i];
949 0 : }
950 :
951 0 : Double_t int0[4];
952 0 : Double_t int1[4];
953 :
954 0 : fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
955 :
956 0 : for (Int_t j = 0; j < 4; j++) {
957 : //
958 : // Quench only central jets and with E > 10.
959 : //
960 :
961 :
962 0 : Int_t itype = (qPdg[j] == 21) ? 2 : 1;
963 0 : Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
964 :
965 0 : if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
966 0 : fZQuench[j] = 0.;
967 0 : } else {
968 0 : if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
969 0 : icall ++;
970 0 : eMean += eloss;
971 0 : }
972 : //
973 : // Extra pt
974 0 : Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
975 0 : wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
976 : //
977 : // Fractional energy loss
978 0 : fZQuench[j] = eloss / eq[j];
979 : //
980 : // Avoid complete loss
981 : //
982 0 : if (fZQuench[j] > fZmax) fZQuench[j] = fZmax;
983 : //
984 : // Some debug printing
985 :
986 :
987 : // printf("Initial parton # %3d, Type %3d Energy %10.3f Phi %10.3f Length %10.3f Loss %10.3f Kick %10.3f Mean: %10.3f %10.3f\n",
988 : // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
989 :
990 : // fZQuench[j] = 0.8;
991 : // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
992 : }
993 :
994 0 : quenched[j] = (fZQuench[j] > 0.01);
995 : } // primary partons
996 :
997 :
998 :
999 0 : Double_t pNew[1000][4];
1000 0 : Int_t kNew[1000];
1001 : Int_t icount = 0;
1002 0 : Double_t zquench[4];
1003 :
1004 : //
1005 : // System Loop
1006 0 : for (Int_t isys = 0; isys < 4; isys++) {
1007 : // Skip to next system if not quenched.
1008 0 : if (!quenched[isys]) continue;
1009 :
1010 0 : nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
1011 0 : if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax;
1012 0 : zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
1013 0 : wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
1014 :
1015 :
1016 :
1017 : Int_t igMin = -1;
1018 : Int_t igMax = -1;
1019 : Double_t pg[4] = {0., 0., 0., 0.};
1020 :
1021 : //
1022 : // Loop on radiation events
1023 :
1024 0 : for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
1025 : while (1) {
1026 : icount = 0;
1027 0 : for (Int_t k = 0; k < 4; k++)
1028 : {
1029 0 : p0[isys][k] = 0.;
1030 0 : p1[isys][k] = 0.;
1031 0 : p2[isys][k] = 0.;
1032 : }
1033 : // Loop over partons
1034 0 : for (Int_t i = 0; i < numpart; i++)
1035 : {
1036 0 : imo = fPyjets->K[2][i];
1037 0 : kst = fPyjets->K[0][i];
1038 0 : pdg = fPyjets->K[1][i];
1039 :
1040 :
1041 :
1042 : // Quarks and gluons only
1043 0 : if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
1044 : // Particles from hard scattering only
1045 :
1046 0 : if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
1047 0 : Int_t imom = imo % 1000;
1048 0 : if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
1049 0 : if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
1050 :
1051 :
1052 : // Skip comment lines
1053 0 : if (kst != 1 && kst != 2) continue;
1054 : //
1055 : // Parton kinematic
1056 0 : px = fPyjets->P[0][i];
1057 0 : py = fPyjets->P[1][i];
1058 0 : pz = fPyjets->P[2][i];
1059 0 : e = fPyjets->P[3][i];
1060 0 : m = fPyjets->P[4][i];
1061 0 : pt = TMath::Sqrt(px * px + py * py);
1062 0 : p = TMath::Sqrt(px * px + py * py + pz * pz);
1063 0 : phi = TMath::Pi() + TMath::ATan2(-py, -px);
1064 0 : theta = TMath::ATan2(pt, pz);
1065 :
1066 : //
1067 : // Save 4-momentum sum for balancing
1068 : Int_t index = isys;
1069 :
1070 0 : p0[index][0] += px;
1071 0 : p0[index][1] += py;
1072 0 : p0[index][2] += pz;
1073 0 : p0[index][3] += e;
1074 :
1075 0 : klast[index] = i;
1076 :
1077 : //
1078 : // Fractional energy loss
1079 0 : Double_t z = zquench[index];
1080 :
1081 :
1082 : // Don't fully quench radiated gluons
1083 : //
1084 0 : if (imo > 1000) {
1085 : // This small factor makes sure that the gluons are not too close in phase space to avoid recombination
1086 : //
1087 :
1088 : z = 0.02;
1089 : }
1090 : // printf("z: %d %f\n", imo, z);
1091 :
1092 :
1093 : //
1094 :
1095 : //
1096 : //
1097 : // Transform into frame in which initial parton is along z-axis
1098 : //
1099 0 : TVector3 v(px, py, pz);
1100 0 : v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
1101 0 : Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
1102 :
1103 0 : Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
1104 0 : Double_t mt2 = jt * jt + m * m;
1105 : Double_t zmax = 1.;
1106 : //
1107 : // Kinematic limit on z
1108 : //
1109 0 : if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
1110 : //
1111 : // Change light-cone kinematics rel. to initial parton
1112 : //
1113 0 : Double_t eppzOld = e + pl;
1114 0 : Double_t empzOld = e - pl;
1115 :
1116 0 : Double_t eppzNew = (1. - z) * eppzOld;
1117 0 : Double_t empzNew = empzOld - mt2 * z / eppzOld;
1118 0 : Double_t eNew = 0.5 * (eppzNew + empzNew);
1119 0 : Double_t plNew = 0.5 * (eppzNew - empzNew);
1120 :
1121 : Double_t jtNew;
1122 : //
1123 : // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
1124 0 : Double_t mt2New = eppzNew * empzNew;
1125 0 : if (mt2New < 1.e-8) mt2New = 0.;
1126 0 : if (z < zmax) {
1127 0 : if (m * m > mt2New) {
1128 : //
1129 : // This should not happen
1130 : //
1131 0 : Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
1132 : jtNew = 0;
1133 0 : } else {
1134 0 : jtNew = TMath::Sqrt(mt2New - m * m);
1135 : }
1136 : } else {
1137 : // If pT is to small (probably a leading massive particle) we scale only the energy
1138 : // This can cause negative masses of the radiated gluon
1139 : // Let's hope for the best ...
1140 : jtNew = jt;
1141 0 : eNew = TMath::Sqrt(plNew * plNew + mt2);
1142 :
1143 : }
1144 : //
1145 : // Calculate new px, py
1146 : //
1147 : Double_t pxNew = 0;
1148 : Double_t pyNew = 0;
1149 :
1150 0 : if (jt>0) {
1151 0 : pxNew = jtNew / jt * pxs;
1152 0 : pyNew = jtNew / jt * pys;
1153 0 : }
1154 : // Double_t dpx = pxs - pxNew;
1155 : // Double_t dpy = pys - pyNew;
1156 : // Double_t dpz = pl - plNew;
1157 : // Double_t de = e - eNew;
1158 : // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
1159 : // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
1160 : // printf("New mass (2) %e %e \n", pxNew, pyNew);
1161 : //
1162 : // Rotate back
1163 : //
1164 0 : TVector3 w(pxNew, pyNew, plNew);
1165 0 : w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
1166 0 : pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
1167 :
1168 0 : p1[index][0] += pxNew;
1169 0 : p1[index][1] += pyNew;
1170 0 : p1[index][2] += plNew;
1171 0 : p1[index][3] += eNew;
1172 : //
1173 : // Updated 4-momentum vectors
1174 : //
1175 0 : pNew[icount][0] = pxNew;
1176 0 : pNew[icount][1] = pyNew;
1177 0 : pNew[icount][2] = plNew;
1178 0 : pNew[icount][3] = eNew;
1179 0 : kNew[icount] = i;
1180 0 : icount++;
1181 0 : } // parton loop
1182 : //
1183 : // Check if there was phase-space for quenching
1184 : //
1185 :
1186 0 : if (icount == 0) quenched[isys] = kFALSE;
1187 0 : if (!quenched[isys]) break;
1188 :
1189 0 : for (Int_t j = 0; j < 4; j++)
1190 : {
1191 0 : p2[isys][j] = p0[isys][j] - p1[isys][j];
1192 : }
1193 0 : p2[isys][4] = p2[isys][3] * p2[isys][3] - p2[isys][0] * p2[isys][0] - p2[isys][1] * p2[isys][1] - p2[isys][2] * p2[isys][2];
1194 0 : if (p2[isys][4] > 0.) {
1195 0 : p2[isys][4] = TMath::Sqrt(p2[isys][4]);
1196 0 : break;
1197 : } else {
1198 0 : printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
1199 0 : printf("4-Momentum: %10.3e %10.3e %10.3e %10.3e %10.3e \n", p2[isys][0], p2[isys][1], p2[isys][2], p2[isys][3], p2[isys][4]);
1200 0 : if (p2[isys][4] < -0.01) {
1201 0 : printf("Negative mass squared !\n");
1202 : // Here we have to put the gluon back to mass shell
1203 : // This will lead to a small energy imbalance
1204 0 : p2[isys][4] = 0.;
1205 0 : p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1206 0 : break;
1207 : } else {
1208 0 : p2[isys][4] = 0.;
1209 0 : break;
1210 : }
1211 : }
1212 : /*
1213 : zHeavy *= 0.98;
1214 : printf("zHeavy lowered to %f\n", zHeavy);
1215 : if (zHeavy < 0.01) {
1216 : printf("No success ! \n");
1217 : icount = 0;
1218 : quenched[isys] = kFALSE;
1219 : break;
1220 : }
1221 : */
1222 : } // iteration on z (while)
1223 :
1224 : // Update event record
1225 0 : for (Int_t k = 0; k < icount; k++) {
1226 : // printf("%6d %6d %10.3e %10.3e %10.3e %10.3e\n", k, kNew[k], pNew[k][0],pNew[k][1], pNew[k][2], pNew[k][3] );
1227 0 : fPyjets->P[0][kNew[k]] = pNew[k][0];
1228 0 : fPyjets->P[1][kNew[k]] = pNew[k][1];
1229 0 : fPyjets->P[2][kNew[k]] = pNew[k][2];
1230 0 : fPyjets->P[3][kNew[k]] = pNew[k][3];
1231 : }
1232 : //
1233 : // Add the gluons
1234 : //
1235 : Int_t ish = 0;
1236 : Int_t iGlu;
1237 0 : if (!quenched[isys]) continue;
1238 : //
1239 : // Last parton from shower i
1240 0 : Int_t in = klast[isys];
1241 : //
1242 : // Continue if no parton in shower i selected
1243 0 : if (in == -1) continue;
1244 : //
1245 : // If this is the second initial parton and it is behind the first move pointer by previous ish
1246 0 : if (isys == 1 && klast[1] > klast[0]) in += ish;
1247 : //
1248 : // Starting index
1249 :
1250 : // jmin = in - 1;
1251 : // How many additional gluons will be generated
1252 : ish = 1;
1253 0 : if (p2[isys][4] > 0.05) ish = 2;
1254 : //
1255 : // Position of gluons
1256 : iGlu = numpart;
1257 0 : if (iglu == 0) igMin = iGlu;
1258 : igMax = iGlu;
1259 0 : numpart += ish;
1260 0 : (fPyjets->N) += ish;
1261 :
1262 0 : if (ish == 1) {
1263 0 : fPyjets->P[0][iGlu] = p2[isys][0];
1264 0 : fPyjets->P[1][iGlu] = p2[isys][1];
1265 0 : fPyjets->P[2][iGlu] = p2[isys][2];
1266 0 : fPyjets->P[3][iGlu] = p2[isys][3];
1267 0 : fPyjets->P[4][iGlu] = p2[isys][4];
1268 :
1269 0 : fPyjets->K[0][iGlu] = 1;
1270 0 : if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
1271 0 : fPyjets->K[1][iGlu] = 21;
1272 0 : fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1273 0 : fPyjets->K[3][iGlu] = -1;
1274 0 : fPyjets->K[4][iGlu] = -1;
1275 :
1276 0 : pg[0] += p2[isys][0];
1277 0 : pg[1] += p2[isys][1];
1278 0 : pg[2] += p2[isys][2];
1279 0 : pg[3] += p2[isys][3];
1280 0 : } else {
1281 : //
1282 : // Split gluon in rest frame.
1283 : //
1284 0 : Double_t bx = p2[isys][0] / p2[isys][3];
1285 0 : Double_t by = p2[isys][1] / p2[isys][3];
1286 0 : Double_t bz = p2[isys][2] / p2[isys][3];
1287 0 : Double_t pst = p2[isys][4] / 2.;
1288 : //
1289 : // Isotropic decay ????
1290 0 : Double_t cost = 2. * gRandom->Rndm() - 1.;
1291 0 : Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost));
1292 0 : Double_t phis = 2. * TMath::Pi() * gRandom->Rndm();
1293 :
1294 0 : Double_t pz1 = pst * cost;
1295 0 : Double_t pz2 = -pst * cost;
1296 0 : Double_t pt1 = pst * sint;
1297 0 : Double_t pt2 = -pst * sint;
1298 0 : Double_t px1 = pt1 * TMath::Cos(phis);
1299 0 : Double_t py1 = pt1 * TMath::Sin(phis);
1300 0 : Double_t px2 = pt2 * TMath::Cos(phis);
1301 0 : Double_t py2 = pt2 * TMath::Sin(phis);
1302 :
1303 0 : fPyjets->P[0][iGlu] = px1;
1304 0 : fPyjets->P[1][iGlu] = py1;
1305 0 : fPyjets->P[2][iGlu] = pz1;
1306 0 : fPyjets->P[3][iGlu] = pst;
1307 0 : fPyjets->P[4][iGlu] = 0.;
1308 :
1309 0 : fPyjets->K[0][iGlu] = 1 ;
1310 0 : fPyjets->K[1][iGlu] = 21;
1311 0 : fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1312 0 : fPyjets->K[3][iGlu] = -1;
1313 0 : fPyjets->K[4][iGlu] = -1;
1314 :
1315 0 : fPyjets->P[0][iGlu+1] = px2;
1316 0 : fPyjets->P[1][iGlu+1] = py2;
1317 0 : fPyjets->P[2][iGlu+1] = pz2;
1318 0 : fPyjets->P[3][iGlu+1] = pst;
1319 0 : fPyjets->P[4][iGlu+1] = 0.;
1320 :
1321 0 : fPyjets->K[0][iGlu+1] = 1;
1322 0 : if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
1323 0 : fPyjets->K[1][iGlu+1] = 21;
1324 0 : fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
1325 0 : fPyjets->K[3][iGlu+1] = -1;
1326 0 : fPyjets->K[4][iGlu+1] = -1;
1327 0 : SetMSTU(1,0);
1328 0 : SetMSTU(2,0);
1329 : //
1330 : // Boost back
1331 : //
1332 0 : Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1333 : }
1334 : /*
1335 : for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1336 : Double_t px, py, pz;
1337 : px = fPyjets->P[0][ig];
1338 : py = fPyjets->P[1][ig];
1339 : pz = fPyjets->P[2][ig];
1340 : TVector3 v(px, py, pz);
1341 : v.RotateZ(-phiq[isys]);
1342 : v.RotateY(-thetaq[isys]);
1343 : Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1344 : Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1345 : Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1346 : if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1347 : Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1348 : pxs += jtKick * TMath::Cos(phiKick);
1349 : pys += jtKick * TMath::Sin(phiKick);
1350 : TVector3 w(pxs, pys, pzs);
1351 : w.RotateY(thetaq[isys]);
1352 : w.RotateZ(phiq[isys]);
1353 : fPyjets->P[0][ig] = w.X();
1354 : fPyjets->P[1][ig] = w.Y();
1355 : fPyjets->P[2][ig] = w.Z();
1356 : fPyjets->P[2][ig] = w.Mag();
1357 : }
1358 : */
1359 0 : } // kGluon
1360 :
1361 :
1362 : // Check energy conservation
1363 : Double_t pxs = 0.;
1364 : Double_t pys = 0.;
1365 : Double_t pzs = 0.;
1366 : Double_t es = 14000.;
1367 :
1368 0 : for (Int_t i = 0; i < numpart; i++)
1369 : {
1370 0 : kst = fPyjets->K[0][i];
1371 0 : if (kst != 1 && kst != 2) continue;
1372 0 : pxs += fPyjets->P[0][i];
1373 0 : pys += fPyjets->P[1][i];
1374 0 : pzs += fPyjets->P[2][i];
1375 0 : es -= fPyjets->P[3][i];
1376 0 : }
1377 0 : if (TMath::Abs(pxs) > 1.e-2 ||
1378 0 : TMath::Abs(pys) > 1.e-2 ||
1379 0 : TMath::Abs(pzs) > 1.e-1) {
1380 0 : printf("%e %e %e %e\n", pxs, pys, pzs, es);
1381 : // Fatal("Quench()", "4-Momentum non-conservation");
1382 0 : }
1383 :
1384 0 : } // end quenching loop (systems)
1385 : // Clean-up
1386 0 : for (Int_t i = 0; i < numpart; i++)
1387 : {
1388 0 : imo = fPyjets->K[2][i];
1389 0 : if (imo > 1000) {
1390 0 : fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1391 0 : }
1392 : }
1393 : // this->Pylist(1);
1394 0 : } // end quench
1395 :
1396 :
1397 : void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1398 : {
1399 : // Igor Lokthine's quenching routine
1400 : // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
1401 :
1402 0 : pyquen(a, ibf, b);
1403 0 : }
1404 :
1405 : void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl)
1406 : {
1407 : // Set the parameters for the PYQUEN package.
1408 : // See comments in PyquenCommon.h
1409 :
1410 :
1411 0 : PYQPAR.t0 = t0;
1412 0 : PYQPAR.tau0 = tau0;
1413 0 : PYQPAR.nf = nf;
1414 0 : PYQPAR.iengl = iengl;
1415 0 : PYQPAR.iangl = iangl;
1416 0 : }
1417 :
1418 :
1419 : void AliPythia::Pyevnw()
1420 : {
1421 : // New multiple interaction scenario
1422 0 : pyevnw();
1423 0 : }
1424 :
1425 : void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax)
1426 : {
1427 : // Call medium-modified Pythia jet reconstruction algorithm
1428 : //
1429 0 : pyshowq(ip1, ip2, qmax);
1430 0 : }
1431 : void AliPythia::Qpygin0()
1432 : {
1433 : // New multiple interaction scenario
1434 0 : qpygin0();
1435 0 : }
1436 :
1437 : void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1438 : {
1439 : // Return event specific quenching parameters
1440 0 : xp = fXJet;
1441 0 : yp = fYJet;
1442 0 : for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1443 :
1444 0 : }
1445 :
1446 : void AliPythia::ConfigHeavyFlavor()
1447 : {
1448 : //
1449 : // Default configuration for Heavy Flavor production
1450 : //
1451 : // All QCD processes
1452 : //
1453 0 : SetMSEL(1);
1454 :
1455 :
1456 0 : if (fItune < 0) {
1457 : // No multiple interactions
1458 0 : SetMSTP(81,0);
1459 0 : SetPARP(81, 0.);
1460 0 : SetPARP(82, 0.);
1461 0 : }
1462 : // Initial/final parton shower on (Pythia default)
1463 0 : SetMSTP(61,1);
1464 0 : SetMSTP(71,1);
1465 :
1466 : // 2nd order alpha_s
1467 0 : SetMSTP(2,2);
1468 :
1469 : // QCD scales
1470 0 : SetMSTP(32,2);
1471 0 : SetPARP(34,1.0);
1472 0 : }
1473 :
1474 : void AliPythia::AtlasTuning()
1475 : {
1476 : //
1477 : // Configuration for the ATLAS tuning
1478 0 : if (fItune > -1) return;
1479 0 : printf("ATLAS TUNE \n");
1480 :
1481 0 : SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf
1482 0 : SetMSTP(81,1); // Multiple Interactions ON
1483 0 : SetMSTP(82,4); // Double Gaussian Model
1484 0 : SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
1485 0 : SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1486 0 : SetPARP(89,1000.); // [GeV] Ref. energy
1487 0 : SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1488 0 : SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1489 0 : SetPARP(84,0.5); // Core radius
1490 0 : SetPARP(85,0.33); // Regulates gluon prod. mechanism
1491 0 : SetPARP(86,0.66); // Regulates gluon prod. mechanism
1492 0 : SetPARP(67,1); // Regulates Initial State Radiation
1493 0 : }
1494 :
1495 : void AliPythia::AtlasTuningMC09()
1496 : {
1497 : //
1498 : // Configuration for the ATLAS tuning
1499 0 : if (fItune > -1) return;
1500 0 : printf("ATLAS New TUNE MC09\n");
1501 0 : SetMSTP(81,21); // treatment for MI, ISR, FSR and beam remnants: MI on, new model
1502 0 : SetMSTP(82, 4); // Double Gaussian Model
1503 0 : SetMSTP(52, 2); // External PDF
1504 0 : SetMSTP(51, 20650); // MRST LO*
1505 :
1506 :
1507 0 : SetMSTP(70, 0); // (was 2: def manual 1, def code 0) virtuality scale for ISR
1508 0 : SetMSTP(72, 1); // (was 0: def 1) maximum scale for FSR
1509 0 : SetMSTP(88, 1); // (was 0: def 1) strategy for qq junction to di-quark or baryon in beam remnant
1510 0 : SetMSTP(90, 0); // (was 1: def 0) strategy of compensate the primordial kT
1511 :
1512 0 : SetPARP(78, 0.3); // the amount of color reconnection in the final state
1513 0 : SetPARP(80, 0.1); // probability of color partons kicked out from beam remnant
1514 0 : SetPARP(82, 2.3); // [GeV] PT_min at Ref. energy
1515 0 : SetPARP(83, 0.8); // Core density in proton matter distribution (def.value)
1516 0 : SetPARP(84, 0.7); // Core radius
1517 0 : SetPARP(90, 0.25); // 2*epsilon (exponent in power law)
1518 0 : SetPARJ(81, 0.29); // (was 0.14: def 0.29) Labmda value in running alpha_s for parton showers
1519 :
1520 0 : SetMSTP(95, 6);
1521 0 : SetPARJ(41, 0.3); // a and b parameters of the symmm. Lund FF
1522 0 : SetPARJ(42, 0.58);
1523 0 : SetPARJ(46, 0.75); // mod. of the Lund FF for heavy end-point quarks
1524 0 : SetPARP(89,1800.); // [GeV] Ref. energy
1525 0 : }
1526 :
1527 : AliPythia& AliPythia::operator=(const AliPythia& rhs)
1528 : {
1529 : // Assignment operator
1530 0 : rhs.Copy(*this);
1531 0 : return *this;
1532 : }
1533 :
1534 : void AliPythia::Copy(TObject&) const
1535 : {
1536 : //
1537 : // Copy
1538 : //
1539 0 : Fatal("Copy","Not implemented!\n");
1540 0 : }
1541 :
1542 : void AliPythia::DalitzDecays()
1543 : {
1544 :
1545 : //
1546 : // Replace all omega dalitz decays with the correct matrix element decays
1547 : //
1548 0 : Int_t nt = fPyjets->N;
1549 0 : for (Int_t i = 0; i < nt; i++) {
1550 0 : if (fPyjets->K[1][i] != 223) continue;
1551 0 : Int_t fd = fPyjets->K[3][i] - 1;
1552 0 : Int_t ld = fPyjets->K[4][i] - 1;
1553 0 : if (fd < 0) continue;
1554 0 : if ((ld - fd) != 2) continue;
1555 0 : if ((fPyjets->K[1][fd] != 111) ||
1556 0 : ((TMath::Abs(fPyjets->K[1][fd+1]) != 11) && (TMath::Abs(fPyjets->K[1][fd+1]) != 13)))
1557 0 : continue;
1558 0 : TLorentzVector omega(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1559 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][fd+1]);
1560 0 : fOmegaDalitz.Decay(pdg, &omega);
1561 0 : for (Int_t j = 0; j < 3; j++) {
1562 0 : for (Int_t k = 0; k < 4; k++) {
1563 0 : TLorentzVector vec = (fOmegaDalitz.Products())[2-j];
1564 0 : fPyjets->P[k][fd+j] = vec[k];
1565 0 : }
1566 : }
1567 0 : }
1568 0 : }
1569 :
1570 :
1571 : //
1572 : // Replace all dalitz(pi0,eta,omega,eta',phi) and resonance(rho,omega,phi,jpsi) decays with the correct matrix element decays
1573 : // for di-electron cocktail calculations
1574 : //
1575 :
1576 :
1577 : void AliPythia::PizeroDalitz()
1578 : {
1579 :
1580 0 : Int_t nt = fPyjets->N;
1581 0 : for (Int_t i = 0; i < nt; i++) {
1582 0 : if (fPyjets->K[1][i] != 111) continue;
1583 0 : Int_t fd = fPyjets->K[3][i] - 1;
1584 0 : Int_t ld = fPyjets->K[4][i] - 1;
1585 0 : if (fd < 0) continue;
1586 0 : if ((ld - fd) != 2) continue;
1587 0 : if ((fPyjets->K[1][fd] != 22) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11) )
1588 0 : continue;
1589 0 : TLorentzVector pizero(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1590 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1591 0 : fExodus.Decay(pdg, &pizero);
1592 0 : for (Int_t j = 0; j < 3; j++) {
1593 0 : for (Int_t k = 0; k < 4; k++) {
1594 0 : TLorentzVector vec = (fExodus.Products_pion())[2-j];
1595 0 : fPyjets->P[k][fd+j] = vec[k];
1596 0 : }
1597 : }
1598 0 : }
1599 0 : }
1600 :
1601 :
1602 : void AliPythia::EtaDalitz()
1603 : {
1604 :
1605 0 : Int_t nt = fPyjets->N;
1606 0 : for (Int_t i = 0; i < nt; i++) {
1607 0 : if (fPyjets->K[1][i] != 221) continue;
1608 0 : Int_t fd = fPyjets->K[3][i] - 1;
1609 0 : Int_t ld = fPyjets->K[4][i] - 1;
1610 0 : if (fd < 0) continue;
1611 0 : if ((ld - fd) != 2) continue;
1612 0 : if ((fPyjets->K[1][fd] != 22) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11))
1613 0 : continue;
1614 0 : TLorentzVector eta(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1615 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1616 0 : fExodus.Decay(pdg, &eta);
1617 0 : for (Int_t j = 0; j < 3; j++) {
1618 0 : for (Int_t k = 0; k < 4; k++) {
1619 0 : TLorentzVector vec = (fExodus.Products_eta())[2-j];
1620 0 : fPyjets->P[k][fd+j] = vec[k];
1621 0 : }
1622 : }
1623 0 : }
1624 0 : }
1625 :
1626 :
1627 : void AliPythia::RhoDirect()
1628 : {
1629 :
1630 0 : Int_t nt = fPyjets->N;
1631 0 : for (Int_t i = 0; i < nt; i++) {
1632 0 : if (fPyjets->K[1][i] != 113) continue;
1633 0 : Int_t fd = fPyjets->K[3][i] - 1;
1634 0 : Int_t ld = fPyjets->K[4][i] - 1;
1635 0 : if (fd < 0) continue;
1636 0 : if ((ld - fd) != 1) continue;
1637 0 : if ((TMath::Abs(fPyjets->K[1][fd]) != 11))
1638 0 : continue;
1639 0 : TLorentzVector rho(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1640 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1641 0 : fExodus.Decay(pdg, &rho);
1642 0 : for (Int_t j = 0; j < 2; j++) {
1643 0 : for (Int_t k = 0; k < 4; k++) {
1644 0 : TLorentzVector vec = (fExodus.Products_rho())[1-j];
1645 0 : fPyjets->P[k][fd+j] = vec[k];
1646 0 : }
1647 : }
1648 0 : }
1649 0 : }
1650 :
1651 :
1652 : void AliPythia::OmegaDalitz()
1653 : {
1654 :
1655 0 : Int_t nt = fPyjets->N;
1656 0 : for (Int_t i = 0; i < nt; i++) {
1657 0 : if (fPyjets->K[1][i] != 223) continue;
1658 0 : Int_t fd = fPyjets->K[3][i] - 1;
1659 0 : Int_t ld = fPyjets->K[4][i] - 1;
1660 0 : if (fd < 0) continue;
1661 0 : if ((ld - fd) != 2) continue;
1662 0 : if ((fPyjets->K[1][fd] != 111) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11))
1663 0 : continue;
1664 0 : TLorentzVector omegadalitz(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1665 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1666 0 : fExodus.Decay(pdg, &omegadalitz);
1667 0 : for (Int_t j = 0; j < 3; j++) {
1668 0 : for (Int_t k = 0; k < 4; k++) {
1669 0 : TLorentzVector vec = (fExodus.Products_omega_dalitz())[2-j];
1670 0 : fPyjets->P[k][fd+j] = vec[k];
1671 0 : }
1672 : }
1673 0 : }
1674 0 : }
1675 :
1676 :
1677 : void AliPythia::OmegaDirect()
1678 : {
1679 :
1680 0 : Int_t nt = fPyjets->N;
1681 0 : for (Int_t i = 0; i < nt; i++) {
1682 0 : if (fPyjets->K[1][i] != 223) continue;
1683 0 : Int_t fd = fPyjets->K[3][i] - 1;
1684 0 : Int_t ld = fPyjets->K[4][i] - 1;
1685 0 : if (fd < 0) continue;
1686 0 : if ((ld - fd) != 1) continue;
1687 0 : if ((TMath::Abs(fPyjets->K[1][fd]) != 11))
1688 0 : continue;
1689 0 : TLorentzVector omegadirect(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1690 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1691 0 : fExodus.Decay(pdg, &omegadirect);
1692 0 : for (Int_t j = 0; j < 2; j++) {
1693 0 : for (Int_t k = 0; k < 4; k++) {
1694 0 : TLorentzVector vec = (fExodus.Products_omega())[1-j];
1695 0 : fPyjets->P[k][fd+j] = vec[k];
1696 0 : }
1697 : }
1698 0 : }
1699 0 : }
1700 :
1701 :
1702 : void AliPythia::EtaprimeDalitz()
1703 : {
1704 :
1705 0 : Int_t nt = fPyjets->N;
1706 0 : for (Int_t i = 0; i < nt; i++) {
1707 0 : if (fPyjets->K[1][i] != 331) continue;
1708 0 : Int_t fd = fPyjets->K[3][i] - 1;
1709 0 : Int_t ld = fPyjets->K[4][i] - 1;
1710 0 : if (fd < 0) continue;
1711 0 : if ((ld - fd) != 2) continue;
1712 0 : if ((fPyjets->K[1][fd] != 22) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11))
1713 0 : continue;
1714 0 : TLorentzVector etaprime(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1715 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1716 0 : fExodus.Decay(pdg, &etaprime);
1717 0 : for (Int_t j = 0; j < 3; j++) {
1718 0 : for (Int_t k = 0; k < 4; k++) {
1719 0 : TLorentzVector vec = (fExodus.Products_etaprime())[2-j];
1720 0 : fPyjets->P[k][fd+j] = vec[k];
1721 0 : }
1722 : }
1723 0 : }
1724 0 : }
1725 :
1726 :
1727 : void AliPythia::PhiDalitz()
1728 : {
1729 :
1730 0 : Int_t nt = fPyjets->N;
1731 0 : for (Int_t i = 0; i < nt; i++) {
1732 0 : if (fPyjets->K[1][i] != 333) continue;
1733 0 : Int_t fd = fPyjets->K[3][i] - 1;
1734 0 : Int_t ld = fPyjets->K[4][i] - 1;
1735 0 : if (fd < 0) continue;
1736 0 : if ((ld - fd) != 2) continue;
1737 0 : if ((fPyjets->K[1][fd] != 221) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11))
1738 0 : continue;
1739 0 : TLorentzVector phidalitz(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1740 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1741 0 : fExodus.Decay(pdg, &phidalitz);
1742 0 : for (Int_t j = 0; j < 3; j++) {
1743 0 : for (Int_t k = 0; k < 4; k++) {
1744 0 : TLorentzVector vec = (fExodus.Products_phi_dalitz())[2-j];
1745 0 : fPyjets->P[k][fd+j] = vec[k];
1746 0 : }
1747 : }
1748 0 : }
1749 0 : }
1750 :
1751 :
1752 : void AliPythia::PhiDirect()
1753 : {
1754 :
1755 0 : Int_t nt = fPyjets->N;
1756 0 : for (Int_t i = 0; i < nt; i++) {
1757 0 : if (fPyjets->K[1][i] != 333) continue;
1758 0 : Int_t fd = fPyjets->K[3][i] - 1;
1759 0 : Int_t ld = fPyjets->K[4][i] - 1;
1760 0 : if (fd < 0) continue;
1761 0 : if ((ld - fd) != 1) continue;
1762 0 : if ((TMath::Abs(fPyjets->K[1][fd]) != 11))
1763 0 : continue;
1764 0 : TLorentzVector phi(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1765 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1766 0 : fExodus.Decay(pdg, &phi);
1767 0 : for (Int_t j = 0; j < 2; j++) {
1768 0 : for (Int_t k = 0; k < 4; k++) {
1769 0 : TLorentzVector vec = (fExodus.Products_phi())[1-j];
1770 0 : fPyjets->P[k][fd+j] = vec[k];
1771 0 : }
1772 : }
1773 0 : }
1774 0 : }
1775 :
1776 : void AliPythia::JPsiDirect()
1777 : {
1778 :
1779 0 : Int_t nt = fPyjets->N;
1780 0 : for (Int_t i = 0; i < nt; i++) {
1781 0 : if (fPyjets->K[1][i] != 443) continue;
1782 0 : Int_t fd = fPyjets->K[3][i] - 1;
1783 0 : Int_t ld = fPyjets->K[4][i] - 1;
1784 0 : if (fd < 0) continue;
1785 0 : if ((ld - fd) != 1) continue;
1786 0 : if ((TMath::Abs(fPyjets->K[1][fd]) != 11))
1787 0 : continue;
1788 0 : TLorentzVector jpsi(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1789 0 : Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1790 0 : fExodus.Decay(pdg, &jpsi);
1791 0 : for (Int_t j = 0; j < 2; j++) {
1792 0 : for (Int_t k = 0; k < 4; k++) {
1793 0 : TLorentzVector vec = (fExodus.Products_jpsi())[1-j];
1794 0 : fPyjets->P[k][fd+j] = vec[k];
1795 0 : }
1796 : }
1797 0 : }
1798 0 : }
1799 :
1800 : Int_t AliPythia::GetNMPI()
1801 : {
1802 : // returns the number of parton-parton interactions
1803 0 : return (GetMSTI(31));
1804 : }
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