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- Removing AliMpSegFactory -> using AliMpSegmentation instead
[u/mrichter/AliRoot.git] / PYTHIA6 / AliPythia.cxx
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6b435cde 1
8d2cd130 2/**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
7 * *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
16
7cdba479 17/* $Id$ */
8d2cd130 18
19#include "AliPythia.h"
7cdba479 20#include "AliPythiaRndm.h"
0f482ae4 21#include "../FASTSIM/AliFastGlauber.h"
22#include "../FASTSIM/AliQuenchingWeights.h"
23#include "TVector3.h"
8d2cd130 24
25ClassImp(AliPythia)
26
27#ifndef WIN32
28# define pyclus pyclus_
29# define pycell pycell_
452af8c7 30# define pyshow pyshow_
31# define pyrobo pyrobo_
992f2843 32# define pyquen pyquen_
16a82508 33# define pyevnw pyevnw_
8d2cd130 34# define type_of_call
35#else
36# define pyclus PYCLUS
37# define pycell PYCELL
452af8c7 38# define pyrobo PYROBO
992f2843 39# define pyquen PYQUEN
16a82508 40# define pyevnw PYEVNW
8d2cd130 41# define type_of_call _stdcall
42#endif
43
44extern "C" void type_of_call pyclus(Int_t & );
45extern "C" void type_of_call pycell(Int_t & );
452af8c7 46extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
47extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
992f2843 48extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
0a2cfc0a 49extern "C" void type_of_call pyevnw(){;}
8d2cd130 50
51//_____________________________________________________________________________
52
53AliPythia* AliPythia::fgAliPythia=NULL;
54
e8a8adcd 55AliPythia::AliPythia():
56 fProcess(kPyMb),
57 fEcms(0.),
58 fStrucFunc(kCTEQ5L),
59 fXJet(0.),
60 fYJet(0.),
61 fGlauber(0),
62 fQuenchingWeights(0)
8d2cd130 63{
64// Default Constructor
65//
66// Set random number
7cdba479 67 if (!AliPythiaRndm::GetPythiaRandom())
68 AliPythiaRndm::SetPythiaRandom(GetRandom());
0f482ae4 69 fGlauber = 0;
70 fQuenchingWeights = 0;
8d2cd130 71}
72
e8a8adcd 73AliPythia::AliPythia(const AliPythia& pythia):
6b435cde 74 TPythia6(pythia),
75 AliRndm(pythia),
e8a8adcd 76 fProcess(kPyMb),
77 fEcms(0.),
78 fStrucFunc(kCTEQ5L),
79 fXJet(0.),
80 fYJet(0.),
81 fGlauber(0),
82 fQuenchingWeights(0)
83{
84 // Copy Constructor
85 pythia.Copy(*this);
86}
87
8d2cd130 88void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
89{
90// Initialise the process to generate
7cdba479 91 if (!AliPythiaRndm::GetPythiaRandom())
92 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 93
94 fProcess = process;
95 fEcms = energy;
96 fStrucFunc = strucfunc;
1d5b1b20 97//...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
98 SetMDCY(Pycomp(111) ,1,0);
99 SetMDCY(Pycomp(310) ,1,0);
100 SetMDCY(Pycomp(3122),1,0);
101 SetMDCY(Pycomp(3112),1,0);
102 SetMDCY(Pycomp(3212),1,0);
103 SetMDCY(Pycomp(3222),1,0);
104 SetMDCY(Pycomp(3312),1,0);
105 SetMDCY(Pycomp(3322),1,0);
106 SetMDCY(Pycomp(3334),1,0);
1c50ec12 107 // Select structure function
8d2cd130 108 SetMSTP(52,2);
109 SetMSTP(51,strucfunc);
1c50ec12 110 // Particles produced in string fragmentation point directly to either of the two endpoints
111 // of the string (depending in the side they were generated from).
112 SetMSTU(16,2);
113
8d2cd130 114//
115// Pythia initialisation for selected processes//
116//
117// Make MSEL clean
118//
119 for (Int_t i=1; i<= 200; i++) {
120 SetMSUB(i,0);
121 }
122// select charm production
123 switch (process)
124 {
65f2626c 125 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
126// Multiple interactions on.
127 SetMSTP(81,1);
128// Double Gaussian matter distribution.
129 SetMSTP(82,4);
130 SetPARP(83,0.5);
131 SetPARP(84,0.4);
132// pT0.
133 SetPARP(82,2.0);
134// Reference energy for pT0 and energy rescaling pace.
135 SetPARP(89,1800);
136 SetPARP(90,0.25);
137// String drawing almost completely minimizes string length.
138 SetPARP(85,0.9);
139 SetPARP(86,0.95);
140// ISR and FSR activity.
141 SetPARP(67,4);
142 SetPARP(71,4);
143// Lambda_FSR scale.
144 SetPARJ(81,0.29);
145 break;
146 case kPyOldUEQ2ordered2:
147// Old underlying events with Q2 ordered QCD processes
148// Multiple interactions on.
149 SetMSTP(81,1);
150// Double Gaussian matter distribution.
151 SetMSTP(82,4);
152 SetPARP(83,0.5);
153 SetPARP(84,0.4);
154// pT0.
155 SetPARP(82,2.0);
156// Reference energy for pT0 and energy rescaling pace.
157 SetPARP(89,1800);
158 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
159// String drawing almost completely minimizes string length.
160 SetPARP(85,0.9);
161 SetPARP(86,0.95);
162// ISR and FSR activity.
163 SetPARP(67,4);
164 SetPARP(71,4);
165// Lambda_FSR scale.
166 SetPARJ(81,0.29);
167 break;
168 case kPyOldPopcorn:
169// Old production mechanism: Old Popcorn
170 SetMSEL(1);
171 SetMSTJ(12,3);
172// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
173 SetMSTP(88,2);
174// (D=1)see can be used to form baryons (BARYON JUNCTION)
175 SetMSTJ(1,1);
e0e89f40 176 AtlasTuning();
65f2626c 177 break;
8d2cd130 178 case kPyCharm:
179 SetMSEL(4);
8d2cd130 180// heavy quark masses
181
182 SetPMAS(4,1,1.2);
8d2cd130 183//
184// primordial pT
185 SetMSTP(91,1);
186 SetPARP(91,1.);
187 SetPARP(93,5.);
188//
189 break;
190 case kPyBeauty:
191 SetMSEL(5);
192 SetPMAS(5,1,4.75);
8d2cd130 193 break;
194 case kPyJpsi:
195 SetMSEL(0);
196// gg->J/Psi g
197 SetMSUB(86,1);
198 break;
199 case kPyJpsiChi:
200 SetMSEL(0);
201// gg->J/Psi g
202 SetMSUB(86,1);
203// gg-> chi_0c g
204 SetMSUB(87,1);
205// gg-> chi_1c g
206 SetMSUB(88,1);
207// gg-> chi_2c g
208 SetMSUB(89,1);
209 break;
210 case kPyCharmUnforced:
211 SetMSEL(0);
212// gq->qg
213 SetMSUB(28,1);
214// gg->qq
215 SetMSUB(53,1);
216// gg->gg
217 SetMSUB(68,1);
218 break;
219 case kPyBeautyUnforced:
220 SetMSEL(0);
221// gq->qg
222 SetMSUB(28,1);
223// gg->qq
224 SetMSUB(53,1);
225// gg->gg
226 SetMSUB(68,1);
227 break;
228 case kPyMb:
229// Minimum Bias pp-Collisions
230//
231//
232// select Pythia min. bias model
233 SetMSEL(0);
511db649 234 SetMSUB(92,1); // single diffraction AB-->XB
235 SetMSUB(93,1); // single diffraction AB-->AX
236 SetMSUB(94,1); // double diffraction
237 SetMSUB(95,1); // low pt production
238
e0e89f40 239 AtlasTuning();
0a0cbcfd 240 break;
241 case kPyLhwgMb:
242// Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
243// -> Pythia 6.3 or above is needed
244//
245 SetMSEL(0);
246 SetMSUB(92,1); // single diffraction AB-->XB
247 SetMSUB(93,1); // single diffraction AB-->AX
248 SetMSUB(94,1); // double diffraction
249 SetMSUB(95,1); // low pt production
250
251 SetMSTP(51,kCTEQ6ll); // CTEQ6ll pdf
252 SetMSTP(52,2);
253 SetMSTP(68,1);
254 SetMSTP(70,2);
255 SetMSTP(81,1); // Multiple Interactions ON
256 SetMSTP(82,4); // Double Gaussian Model
257 SetMSTP(88,1);
258
259 SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
260 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
261 SetPARP(84,0.5); // Core radius
262 SetPARP(85,0.9); // Regulates gluon prod. mechanism
263 SetPARP(90,0.2); // 2*epsilon (exponent in power law)
264
511db649 265 break;
8d2cd130 266 case kPyMbNonDiffr:
267// Minimum Bias pp-Collisions
268//
269//
270// select Pythia min. bias model
271 SetMSEL(0);
511db649 272 SetMSUB(95,1); // low pt production
0f482ae4 273
d7de4a67 274 AtlasTuning();
275 break;
276 case kPyMbMSEL1:
277 ConfigHeavyFlavor();
278// Intrinsic <kT^2>
279 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
280 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
281 SetPARP(93,5.); // Upper cut-off
282// Set Q-quark mass
283 SetPMAS(4,1,1.2); // Charm quark mass
284 SetPMAS(5,1,4.78); // Beauty quark mass
285 SetPARP(71,4.); // Defaut value
286// Atlas Tuning
e0e89f40 287 AtlasTuning();
8d2cd130 288 break;
289 case kPyJets:
290//
291// QCD Jets
292//
293 SetMSEL(1);
65f2626c 294 // Pythia Tune A (CDF)
295 //
296 SetPARP(67,4.); // Regulates Initial State Radiation
297 SetMSTP(82,4); // Double Gaussian Model
298 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
299 SetPARP(84,0.4); // Core radius
300 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
301 SetPARP(86,0.95); // Regulates gluon prod. mechanism
302 SetPARP(89,1800.); // [GeV] Ref. energy
303 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
304 break;
8d2cd130 305 case kPyDirectGamma:
306 SetMSEL(10);
307 break;
adf4d898 308 case kPyCharmPbPbMNR:
309 case kPyD0PbPbMNR:
90d7b703 310 case kPyDPlusPbPbMNR:
e0e89f40 311 case kPyDPlusStrangePbPbMNR:
90d7b703 312 // Tuning of Pythia parameters aimed to get a resonable agreement
313 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
314 // c-cbar single inclusive and double differential distributions.
315 // This parameter settings are meant to work with Pb-Pb collisions
316 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
317 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
318 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 319 ConfigHeavyFlavor();
90d7b703 320 // Intrinsic <kT>
321 SetMSTP(91,1);
322 SetPARP(91,1.304);
323 SetPARP(93,6.52);
90d7b703 324 // Set c-quark mass
325 SetPMAS(4,1,1.2);
8d2cd130 326 break;
adf4d898 327 case kPyCharmpPbMNR:
328 case kPyD0pPbMNR:
90d7b703 329 case kPyDPluspPbMNR:
e0e89f40 330 case kPyDPlusStrangepPbMNR:
90d7b703 331 // Tuning of Pythia parameters aimed to get a resonable agreement
332 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
333 // c-cbar single inclusive and double differential distributions.
334 // This parameter settings are meant to work with p-Pb collisions
335 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
336 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
337 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 338 ConfigHeavyFlavor();
90d7b703 339 // Intrinsic <kT>
3dc3ec94 340 SetMSTP(91,1);
341 SetPARP(91,1.16);
342 SetPARP(93,5.8);
343
90d7b703 344 // Set c-quark mass
3dc3ec94 345 SetPMAS(4,1,1.2);
adf4d898 346 break;
347 case kPyCharmppMNR:
348 case kPyD0ppMNR:
90d7b703 349 case kPyDPlusppMNR:
e0e89f40 350 case kPyDPlusStrangeppMNR:
90d7b703 351 // Tuning of Pythia parameters aimed to get a resonable agreement
352 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
353 // c-cbar single inclusive and double differential distributions.
354 // This parameter settings are meant to work with pp collisions
355 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
356 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
357 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 358 ConfigHeavyFlavor();
90d7b703 359 // Intrinsic <kT^2>
3dc3ec94 360 SetMSTP(91,1);
361 SetPARP(91,1.);
362 SetPARP(93,5.);
363
90d7b703 364 // Set c-quark mass
3dc3ec94 365 SetPMAS(4,1,1.2);
adf4d898 366 break;
e0e89f40 367 case kPyCharmppMNRwmi:
368 // Tuning of Pythia parameters aimed to get a resonable agreement
369 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
370 // c-cbar single inclusive and double differential distributions.
371 // This parameter settings are meant to work with pp collisions
372 // and with kCTEQ5L PDFs.
373 // Added multiple interactions according to ATLAS tune settings.
374 // To get a "reasonable" agreement with MNR results, events have to be
375 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
376 // set to 2.76 GeV.
377 // To get a "perfect" agreement with MNR results, events have to be
378 // generated in four ptHard bins with the following relative
379 // normalizations:
380 // 2.76-3 GeV: 25%
381 // 3-4 GeV: 40%
382 // 4-8 GeV: 29%
383 // >8 GeV: 6%
384 ConfigHeavyFlavor();
385 // Intrinsic <kT^2>
386 SetMSTP(91,1);
387 SetPARP(91,1.);
388 SetPARP(93,5.);
389
390 // Set c-quark mass
391 SetPMAS(4,1,1.2);
392 AtlasTuning();
393 break;
adf4d898 394 case kPyBeautyPbPbMNR:
8d2cd130 395 // Tuning of Pythia parameters aimed to get a resonable agreement
396 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
397 // b-bbar single inclusive and double differential distributions.
398 // This parameter settings are meant to work with Pb-Pb collisions
399 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
400 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
401 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 402 ConfigHeavyFlavor();
8d2cd130 403 // QCD scales
3dc3ec94 404 SetPARP(67,1.0);
405 SetPARP(71,1.0);
adf4d898 406 // Intrinsic <kT>
3dc3ec94 407 SetMSTP(91,1);
408 SetPARP(91,2.035);
409 SetPARP(93,10.17);
8d2cd130 410 // Set b-quark mass
3dc3ec94 411 SetPMAS(5,1,4.75);
adf4d898 412 break;
413 case kPyBeautypPbMNR:
414 // Tuning of Pythia parameters aimed to get a resonable agreement
415 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
416 // b-bbar single inclusive and double differential distributions.
417 // This parameter settings are meant to work with p-Pb collisions
418 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
419 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
420 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 421 ConfigHeavyFlavor();
adf4d898 422 // QCD scales
3dc3ec94 423 SetPARP(67,1.0);
424 SetPARP(71,1.0);
adf4d898 425 // Intrinsic <kT>
3dc3ec94 426 SetMSTP(91,1);
427 SetPARP(91,1.60);
428 SetPARP(93,8.00);
adf4d898 429 // Set b-quark mass
3dc3ec94 430 SetPMAS(5,1,4.75);
adf4d898 431 break;
432 case kPyBeautyppMNR:
433 // Tuning of Pythia parameters aimed to get a resonable agreement
434 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
435 // b-bbar single inclusive and double differential distributions.
436 // This parameter settings are meant to work with pp collisions
437 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
438 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
439 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 440 ConfigHeavyFlavor();
adf4d898 441 // QCD scales
3dc3ec94 442 SetPARP(67,1.0);
443 SetPARP(71,1.0);
444
445 // Intrinsic <kT>
446 SetMSTP(91,1);
447 SetPARP(91,1.);
448 SetPARP(93,5.);
449
450 // Set b-quark mass
451 SetPMAS(5,1,4.75);
8d2cd130 452 break;
e0e89f40 453 case kPyBeautyppMNRwmi:
454 // Tuning of Pythia parameters aimed to get a resonable agreement
455 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
456 // b-bbar single inclusive and double differential distributions.
457 // This parameter settings are meant to work with pp collisions
458 // and with kCTEQ5L PDFs.
459 // Added multiple interactions according to ATLAS tune settings.
460 // To get a "reasonable" agreement with MNR results, events have to be
461 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
462 // set to 2.76 GeV.
463 // To get a "perfect" agreement with MNR results, events have to be
464 // generated in four ptHard bins with the following relative
465 // normalizations:
466 // 2.76-4 GeV: 5%
467 // 4-6 GeV: 31%
468 // 6-8 GeV: 28%
469 // >8 GeV: 36%
470 ConfigHeavyFlavor();
471 // QCD scales
472 SetPARP(67,1.0);
473 SetPARP(71,1.0);
474
475 // Intrinsic <kT>
476 SetMSTP(91,1);
477 SetPARP(91,1.);
478 SetPARP(93,5.);
479
480 // Set b-quark mass
481 SetPMAS(5,1,4.75);
482
483 AtlasTuning();
484 break;
589380c6 485 case kPyW:
486
487 //Inclusive production of W+/-
488 SetMSEL(0);
489 //f fbar -> W+
490 SetMSUB(2,1);
491 // //f fbar -> g W+
492 // SetMSUB(16,1);
493 // //f fbar -> gamma W+
494 // SetMSUB(20,1);
495 // //f g -> f W+
496 // SetMSUB(31,1);
497 // //f gamma -> f W+
498 // SetMSUB(36,1);
499
500 // Initial/final parton shower on (Pythia default)
501 // With parton showers on we are generating "W inclusive process"
502 SetMSTP(61,1); //Initial QCD & QED showers on
503 SetMSTP(71,1); //Final QCD & QED showers on
504
505 break;
0f6ee828 506
507 case kPyZ:
508
509 //Inclusive production of Z
510 SetMSEL(0);
511 //f fbar -> Z/gamma
512 SetMSUB(1,1);
513
514 // // f fbar -> g Z/gamma
515 // SetMSUB(15,1);
516 // // f fbar -> gamma Z/gamma
517 // SetMSUB(19,1);
518 // // f g -> f Z/gamma
519 // SetMSUB(30,1);
520 // // f gamma -> f Z/gamma
521 // SetMSUB(35,1);
522
523 //only Z included, not gamma
524 SetMSTP(43,2);
525
526 // Initial/final parton shower on (Pythia default)
527 // With parton showers on we are generating "Z inclusive process"
528 SetMSTP(61,1); //Initial QCD & QED showers on
529 SetMSTP(71,1); //Final QCD & QED showers on
530
531 break;
532
8d2cd130 533 }
534//
535// Initialize PYTHIA
536 SetMSTP(41,1); // all resonance decays switched on
537
538 Initialize("CMS","p","p",fEcms);
539
540}
541
542Int_t AliPythia::CheckedLuComp(Int_t kf)
543{
544// Check Lund particle code (for debugging)
545 Int_t kc=Pycomp(kf);
546 printf("\n Lucomp kf,kc %d %d",kf,kc);
547 return kc;
548}
549
550void AliPythia::SetNuclei(Int_t a1, Int_t a2)
551{
552// Treat protons as inside nuclei with mass numbers a1 and a2
553// The MSTP array in the PYPARS common block is used to enable and
554// select the nuclear structure functions.
555// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
556// =1: internal PYTHIA acording to MSTP(51)
557// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
558// If the following mass number both not equal zero, nuclear corrections of the stf are used.
559// MSTP(192) : Mass number of nucleus side 1
560// MSTP(193) : Mass number of nucleus side 2
561 SetMSTP(52,2);
562 SetMSTP(192, a1);
563 SetMSTP(193, a2);
564}
565
566
567AliPythia* AliPythia::Instance()
568{
569// Set random number generator
570 if (fgAliPythia) {
571 return fgAliPythia;
572 } else {
573 fgAliPythia = new AliPythia();
574 return fgAliPythia;
575 }
576}
577
578void AliPythia::PrintParticles()
579{
580// Print list of particl properties
581 Int_t np = 0;
c31f1d37 582 char* name = new char[16];
8d2cd130 583 for (Int_t kf=0; kf<1000000; kf++) {
584 for (Int_t c = 1; c > -2; c-=2) {
8d2cd130 585 Int_t kc = Pycomp(c*kf);
586 if (kc) {
587 Float_t mass = GetPMAS(kc,1);
588 Float_t width = GetPMAS(kc,2);
589 Float_t tau = GetPMAS(kc,4);
c31f1d37 590
8d2cd130 591 Pyname(kf,name);
592
593 np++;
594
595 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
596 c*kf, name, mass, width, tau);
597 }
598 }
599 }
600 printf("\n Number of particles %d \n \n", np);
601}
602
603void AliPythia::ResetDecayTable()
604{
605// Set default values for pythia decay switches
606 Int_t i;
607 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
608 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
609}
610
611void AliPythia::SetDecayTable()
612{
613// Set default values for pythia decay switches
614//
615 Int_t i;
616 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
617 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
618}
619
620void AliPythia::Pyclus(Int_t& njet)
621{
622// Call Pythia clustering algorithm
623//
624 pyclus(njet);
625}
626
627void AliPythia::Pycell(Int_t& njet)
628{
629// Call Pythia jet reconstruction algorithm
630//
631 pycell(njet);
632}
633
452af8c7 634void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
635{
636// Call Pythia jet reconstruction algorithm
637//
452af8c7 638 pyshow(ip1, ip2, qmax);
639}
640
641void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
642{
643 pyrobo(imi, ima, the, phi, bex, bey, bez);
644}
645
646
647
86b6ad68 648void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod)
0f482ae4 649{
650// Initializes
651// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
652// (2) The nuclear geometry using the Glauber Model
653//
6b435cde 654
0f482ae4 655 fGlauber = new AliFastGlauber();
656 fGlauber->Init(2);
657 fGlauber->SetCentralityClass(cMin, cMax);
658
659 fQuenchingWeights = new AliQuenchingWeights();
660 fQuenchingWeights->InitMult();
86b6ad68 661 fQuenchingWeights->SetK(k);
0f482ae4 662 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
0f482ae4 663}
664
665
452af8c7 666void AliPythia::Quench()
667{
668//
669//
670// Simple Jet Quenching routine:
671// =============================
672// The jet formed by all final state partons radiated by the parton created
0f482ae4 673// in the hard collisions is quenched by a factor (1-z) using light cone variables in
674// the initial parton reference frame:
452af8c7 675// (E + p_z)new = (1-z) (E + p_z)old
676//
0f482ae4 677//
678//
679//
452af8c7 680// The lost momentum is first balanced by one gluon with virtuality > 0.
681// Subsequently the gluon splits to yield two gluons with E = p.
682//
0f482ae4 683//
684//
4e383037 685 static Float_t eMean = 0.;
686 static Int_t icall = 0;
0f482ae4 687
c2c598a3 688 Double_t p0[4][5];
689 Double_t p1[4][5];
690 Double_t p2[4][5];
691 Int_t klast[4] = {-1, -1, -1, -1};
452af8c7 692
693 Int_t numpart = fPyjets->N;
86b6ad68 694 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
c2c598a3 695 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
696 Bool_t quenched[4];
b280c4cc 697 Double_t wjtKick[4];
c2c598a3 698 Int_t nGluon[4];
86b6ad68 699 Int_t qPdg[4];
0f482ae4 700 Int_t imo, kst, pdg;
b280c4cc 701
511db649 702//
c2c598a3 703// Sore information about Primary partons
704//
705// j =
706// 0, 1 partons from hard scattering
707// 2, 3 partons from initial state radiation
708//
709 for (Int_t i = 2; i <= 7; i++) {
710 Int_t j = 0;
711 // Skip gluons that participate in hard scattering
712 if (i == 4 || i == 5) continue;
713 // Gluons from hard Scattering
714 if (i == 6 || i == 7) {
715 j = i - 6;
716 pxq[j] = fPyjets->P[0][i];
717 pyq[j] = fPyjets->P[1][i];
718 pzq[j] = fPyjets->P[2][i];
719 eq[j] = fPyjets->P[3][i];
720 mq[j] = fPyjets->P[4][i];
721 } else {
722 // Gluons from initial state radiation
723 //
724 // Obtain 4-momentum vector from difference between original parton and parton after gluon
725 // radiation. Energy is calculated independently because initial state radition does not
726 // conserve strictly momentum and energy for each partonic system independently.
727 //
728 // Not very clean. Should be improved !
729 //
730 //
731 j = i;
732 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
733 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
734 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
735 mq[j] = fPyjets->P[4][i];
736 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
737 }
738//
739// Calculate some kinematic variables
511db649 740//
4e383037 741 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
0f482ae4 742 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
743 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
744 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
745 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
86b6ad68 746 qPdg[j] = fPyjets->K[1][i];
747 }
748
749 Double_t int0[4];
750 Double_t int1[4];
86b6ad68 751
b280c4cc 752 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
753
86b6ad68 754 for (Int_t j = 0; j < 4; j++) {
c2c598a3 755 //
756 // Quench only central jets and with E > 10.
757 //
86b6ad68 758
759
760 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
761 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
762
c2c598a3 763 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
b280c4cc 764 fZQuench[j] = 0.;
0f482ae4 765 } else {
c2c598a3 766 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
4e383037 767 icall ++;
768 eMean += eloss;
769 }
0f482ae4 770 //
771 // Extra pt
86b6ad68 772 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
773 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
0f482ae4 774 //
775 // Fractional energy loss
b280c4cc 776 fZQuench[j] = eloss / eq[j];
0f482ae4 777 //
778 // Avoid complete loss
779 //
6b435cde 780 if (fZQuench[j] == 1.) fZQuench[j] = 0.97;
0f482ae4 781 //
782 // Some debug printing
86b6ad68 783
784
bf9bb016 785// 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",
786// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
4e383037 787
b280c4cc 788// fZQuench[j] = 0.8;
789// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
0f482ae4 790 }
4e383037 791
b280c4cc 792 quenched[j] = (fZQuench[j] > 0.01);
4e383037 793 } // primary partons
c2c598a3 794
b280c4cc 795
796
6e90ad26 797 Double_t pNew[1000][4];
798 Int_t kNew[1000];
799 Int_t icount = 0;
b280c4cc 800 Double_t zquench[4];
801
6e90ad26 802//
4e383037 803// System Loop
c2c598a3 804 for (Int_t isys = 0; isys < 4; isys++) {
6e90ad26 805// Skip to next system if not quenched.
4e383037 806 if (!quenched[isys]) continue;
807
b280c4cc 808 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
6b435cde 809 if (nGluon[isys] > 30) nGluon[isys] = 30;
b280c4cc 810 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
4e383037 811 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
0f482ae4 812
4e383037 813
814
815 Int_t igMin = -1;
816 Int_t igMax = -1;
817 Double_t pg[4] = {0., 0., 0., 0.};
818
819//
820// Loop on radiation events
821
822 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
6e90ad26 823 while (1) {
824 icount = 0;
825 for (Int_t k = 0; k < 4; k++)
826 {
827 p0[isys][k] = 0.;
828 p1[isys][k] = 0.;
829 p2[isys][k] = 0.;
830 }
831// Loop over partons
832 for (Int_t i = 0; i < numpart; i++)
833 {
834 imo = fPyjets->K[2][i];
835 kst = fPyjets->K[0][i];
836 pdg = fPyjets->K[1][i];
837
838
839
0f482ae4 840// Quarks and gluons only
6e90ad26 841 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
0f482ae4 842// Particles from hard scattering only
c2c598a3 843
6e90ad26 844 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
c2c598a3 845 Int_t imom = imo % 1000;
846 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
847 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
848
6e90ad26 849
0f482ae4 850// Skip comment lines
6e90ad26 851 if (kst != 1 && kst != 2) continue;
0f482ae4 852//
853// Parton kinematic
6e90ad26 854 px = fPyjets->P[0][i];
855 py = fPyjets->P[1][i];
856 pz = fPyjets->P[2][i];
857 e = fPyjets->P[3][i];
858 m = fPyjets->P[4][i];
859 pt = TMath::Sqrt(px * px + py * py);
860 p = TMath::Sqrt(px * px + py * py + pz * pz);
861 phi = TMath::Pi() + TMath::ATan2(-py, -px);
862 theta = TMath::ATan2(pt, pz);
863
0f482ae4 864//
c2c598a3 865// Save 4-momentum sum for balancing
866 Int_t index = isys;
6e90ad26 867
868 p0[index][0] += px;
869 p0[index][1] += py;
870 p0[index][2] += pz;
871 p0[index][3] += e;
6e90ad26 872
873 klast[index] = i;
874
0f482ae4 875//
876// Fractional energy loss
b280c4cc 877 Double_t z = zquench[index];
4e383037 878
c2c598a3 879
4e383037 880// Don't fully quench radiated gluons
881//
882 if (imo > 1000) {
883// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
884//
885
c2c598a3 886 z = 0.02;
4e383037 887 }
c2c598a3 888// printf("z: %d %f\n", imo, z);
889
4e383037 890
891//
6e90ad26 892
893 //
894 //
895 // Transform into frame in which initial parton is along z-axis
896 //
897 TVector3 v(px, py, pz);
898 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
899 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
900
901 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
902 Double_t mt2 = jt * jt + m * m;
903 Double_t zmax = 1.;
904 //
905 // Kinematic limit on z
906 //
4e383037 907 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
6e90ad26 908 //
909 // Change light-cone kinematics rel. to initial parton
910 //
911 Double_t eppzOld = e + pl;
912 Double_t empzOld = e - pl;
913
914 Double_t eppzNew = (1. - z) * eppzOld;
915 Double_t empzNew = empzOld - mt2 * z / eppzOld;
916 Double_t eNew = 0.5 * (eppzNew + empzNew);
917 Double_t plNew = 0.5 * (eppzNew - empzNew);
918
919 Double_t jtNew;
920 //
921 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
922 Double_t mt2New = eppzNew * empzNew;
923 if (mt2New < 1.e-8) mt2New = 0.;
4e383037 924 if (z < zmax) {
925 if (m * m > mt2New) {
926 //
927 // This should not happen
928 //
929 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
930 jtNew = 0;
931 } else {
932 jtNew = TMath::Sqrt(mt2New - m * m);
933 }
6e90ad26 934 } else {
4e383037 935 // If pT is to small (probably a leading massive particle) we scale only the energy
936 // This can cause negative masses of the radiated gluon
937 // Let's hope for the best ...
938 jtNew = jt;
939 eNew = TMath::Sqrt(plNew * plNew + mt2);
940
6e90ad26 941 }
6e90ad26 942 //
943 // Calculate new px, py
944 //
945 Double_t pxNew = jtNew / jt * pxs;
946 Double_t pyNew = jtNew / jt * pys;
947
948// Double_t dpx = pxs - pxNew;
949// Double_t dpy = pys - pyNew;
950// Double_t dpz = pl - plNew;
951// Double_t de = e - eNew;
952// Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
953// printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
954// printf("New mass (2) %e %e \n", pxNew, pyNew);
955 //
956 // Rotate back
957 //
958 TVector3 w(pxNew, pyNew, plNew);
959 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
960 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
961
962 p1[index][0] += pxNew;
963 p1[index][1] += pyNew;
964 p1[index][2] += plNew;
965 p1[index][3] += eNew;
966 //
967 // Updated 4-momentum vectors
968 //
969 pNew[icount][0] = pxNew;
970 pNew[icount][1] = pyNew;
971 pNew[icount][2] = plNew;
972 pNew[icount][3] = eNew;
973 kNew[icount] = i;
974 icount++;
975 } // parton loop
0f482ae4 976 //
6e90ad26 977 // Check if there was phase-space for quenching
0f482ae4 978 //
0f482ae4 979
6e90ad26 980 if (icount == 0) quenched[isys] = kFALSE;
981 if (!quenched[isys]) break;
982
983 for (Int_t j = 0; j < 4; j++)
984 {
985 p2[isys][j] = p0[isys][j] - p1[isys][j];
986 }
987 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];
6e90ad26 988 if (p2[isys][4] > 0.) {
989 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
990 break;
991 } else {
b280c4cc 992 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
4e383037 993 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]);
6e90ad26 994 if (p2[isys][4] < -0.01) {
4e383037 995 printf("Negative mass squared !\n");
996 // Here we have to put the gluon back to mass shell
997 // This will lead to a small energy imbalance
998 p2[isys][4] = 0.;
999 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1000 break;
6e90ad26 1001 } else {
1002 p2[isys][4] = 0.;
1003 break;
1004 }
1005 }
6e90ad26 1006 /*
6e90ad26 1007 zHeavy *= 0.98;
1008 printf("zHeavy lowered to %f\n", zHeavy);
1009 if (zHeavy < 0.01) {
1010 printf("No success ! \n");
1011 icount = 0;
1012 quenched[isys] = kFALSE;
1013 break;
1014 }
4e383037 1015 */
1016 } // iteration on z (while)
1017
6e90ad26 1018// Update event record
1019 for (Int_t k = 0; k < icount; k++) {
1020// 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] );
1021 fPyjets->P[0][kNew[k]] = pNew[k][0];
1022 fPyjets->P[1][kNew[k]] = pNew[k][1];
1023 fPyjets->P[2][kNew[k]] = pNew[k][2];
1024 fPyjets->P[3][kNew[k]] = pNew[k][3];
0f482ae4 1025 }
4e383037 1026 //
1027 // Add the gluons
1028 //
1029 Int_t ish = 0;
1837e95c 1030 Int_t iGlu;
4e383037 1031 if (!quenched[isys]) continue;
0f482ae4 1032//
1033// Last parton from shower i
4e383037 1034 Int_t in = klast[isys];
0f482ae4 1035//
1036// Continue if no parton in shower i selected
1037 if (in == -1) continue;
1038//
1039// If this is the second initial parton and it is behind the first move pointer by previous ish
4e383037 1040 if (isys == 1 && klast[1] > klast[0]) in += ish;
0f482ae4 1041//
1042// Starting index
452af8c7 1043
4e383037 1044// jmin = in - 1;
0f482ae4 1045// How many additional gluons will be generated
1046 ish = 1;
4e383037 1047 if (p2[isys][4] > 0.05) ish = 2;
0f482ae4 1048//
1049// Position of gluons
4e383037 1050 iGlu = numpart;
1051 if (iglu == 0) igMin = iGlu;
1052 igMax = iGlu;
0f482ae4 1053 numpart += ish;
1054 (fPyjets->N) += ish;
4e383037 1055
0f482ae4 1056 if (ish == 1) {
4e383037 1057 fPyjets->P[0][iGlu] = p2[isys][0];
1058 fPyjets->P[1][iGlu] = p2[isys][1];
1059 fPyjets->P[2][iGlu] = p2[isys][2];
1060 fPyjets->P[3][iGlu] = p2[isys][3];
1061 fPyjets->P[4][iGlu] = p2[isys][4];
0f482ae4 1062
4e383037 1063 fPyjets->K[0][iGlu] = 1;
1064 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
0f482ae4 1065 fPyjets->K[1][iGlu] = 21;
4e383037 1066 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1067 fPyjets->K[3][iGlu] = -1;
1068 fPyjets->K[4][iGlu] = -1;
4e383037 1069
1070 pg[0] += p2[isys][0];
1071 pg[1] += p2[isys][1];
1072 pg[2] += p2[isys][2];
1073 pg[3] += p2[isys][3];
0f482ae4 1074 } else {
1075 //
1076 // Split gluon in rest frame.
1077 //
4e383037 1078 Double_t bx = p2[isys][0] / p2[isys][3];
1079 Double_t by = p2[isys][1] / p2[isys][3];
1080 Double_t bz = p2[isys][2] / p2[isys][3];
1081 Double_t pst = p2[isys][4] / 2.;
0f482ae4 1082 //
1083 // Isotropic decay ????
1084 Double_t cost = 2. * gRandom->Rndm() - 1.;
1085 Double_t sint = TMath::Sqrt(1. - cost * cost);
1086 Double_t phi = 2. * TMath::Pi() * gRandom->Rndm();
1087
1088 Double_t pz1 = pst * cost;
1089 Double_t pz2 = -pst * cost;
1090 Double_t pt1 = pst * sint;
1091 Double_t pt2 = -pst * sint;
1092 Double_t px1 = pt1 * TMath::Cos(phi);
1093 Double_t py1 = pt1 * TMath::Sin(phi);
1094 Double_t px2 = pt2 * TMath::Cos(phi);
1095 Double_t py2 = pt2 * TMath::Sin(phi);
1096
1097 fPyjets->P[0][iGlu] = px1;
1098 fPyjets->P[1][iGlu] = py1;
1099 fPyjets->P[2][iGlu] = pz1;
1100 fPyjets->P[3][iGlu] = pst;
1101 fPyjets->P[4][iGlu] = 0.;
1102
4e383037 1103 fPyjets->K[0][iGlu] = 1 ;
0f482ae4 1104 fPyjets->K[1][iGlu] = 21;
4e383037 1105 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1106 fPyjets->K[3][iGlu] = -1;
1107 fPyjets->K[4][iGlu] = -1;
1108
1109 fPyjets->P[0][iGlu+1] = px2;
1110 fPyjets->P[1][iGlu+1] = py2;
1111 fPyjets->P[2][iGlu+1] = pz2;
1112 fPyjets->P[3][iGlu+1] = pst;
1113 fPyjets->P[4][iGlu+1] = 0.;
1114
4e383037 1115 fPyjets->K[0][iGlu+1] = 1;
1116 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
0f482ae4 1117 fPyjets->K[1][iGlu+1] = 21;
4e383037 1118 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
0f482ae4 1119 fPyjets->K[3][iGlu+1] = -1;
1120 fPyjets->K[4][iGlu+1] = -1;
1121 SetMSTU(1,0);
1122 SetMSTU(2,0);
1123 //
1124 // Boost back
1125 //
1126 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1127 }
4e383037 1128/*
1129 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1130 Double_t px, py, pz;
1131 px = fPyjets->P[0][ig];
1132 py = fPyjets->P[1][ig];
1133 pz = fPyjets->P[2][ig];
1134 TVector3 v(px, py, pz);
1135 v.RotateZ(-phiq[isys]);
1136 v.RotateY(-thetaq[isys]);
1137 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1138 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1139 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1140 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1141 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1142 pxs += jtKick * TMath::Cos(phiKick);
1143 pys += jtKick * TMath::Sin(phiKick);
1144 TVector3 w(pxs, pys, pzs);
1145 w.RotateY(thetaq[isys]);
1146 w.RotateZ(phiq[isys]);
1147 fPyjets->P[0][ig] = w.X();
1148 fPyjets->P[1][ig] = w.Y();
1149 fPyjets->P[2][ig] = w.Z();
1150 fPyjets->P[2][ig] = w.Mag();
1151 }
1152*/
1153 } // kGluon
1154
6e90ad26 1155
4e383037 1156 // Check energy conservation
0f482ae4 1157 Double_t pxs = 0.;
1158 Double_t pys = 0.;
1159 Double_t pzs = 0.;
1160 Double_t es = 14000.;
1161
1162 for (Int_t i = 0; i < numpart; i++)
1163 {
1164 kst = fPyjets->K[0][i];
1165 if (kst != 1 && kst != 2) continue;
1166 pxs += fPyjets->P[0][i];
1167 pys += fPyjets->P[1][i];
1168 pzs += fPyjets->P[2][i];
1169 es -= fPyjets->P[3][i];
1170 }
1171 if (TMath::Abs(pxs) > 1.e-2 ||
1172 TMath::Abs(pys) > 1.e-2 ||
1173 TMath::Abs(pzs) > 1.e-1) {
1174 printf("%e %e %e %e\n", pxs, pys, pzs, es);
4e383037 1175// Fatal("Quench()", "4-Momentum non-conservation");
452af8c7 1176 }
4e383037 1177
1178 } // end quenching loop (systems)
6e90ad26 1179// Clean-up
0f482ae4 1180 for (Int_t i = 0; i < numpart; i++)
1181 {
4e383037 1182 imo = fPyjets->K[2][i];
1183 if (imo > 1000) {
1184 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1185 }
0f482ae4 1186 }
4e383037 1187// this->Pylist(1);
0f482ae4 1188} // end quench
90d7b703 1189
992f2843 1190
1191void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1192{
1193 // Igor Lokthine's quenching routine
1194 pyquen(a, ibf, b);
1195}
b280c4cc 1196
16a82508 1197void AliPythia::Pyevnw()
1198{
1199 // New multiple interaction scenario
1200 pyevnw();
1201}
1202
b280c4cc 1203void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1204{
1205 // Return event specific quenching parameters
1206 xp = fXJet;
1207 yp = fYJet;
1208 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1209
1210}
1211
3dc3ec94 1212void AliPythia::ConfigHeavyFlavor()
1213{
1214 //
1215 // Default configuration for Heavy Flavor production
1216 //
1217 // All QCD processes
1218 //
1219 SetMSEL(1);
1220
1221 // No multiple interactions
1222 SetMSTP(81,0);
39c2e610 1223 SetPARP(81, 0.);
1224 SetPARP(82, 0.);
3dc3ec94 1225 // Initial/final parton shower on (Pythia default)
1226 SetMSTP(61,1);
1227 SetMSTP(71,1);
1228
1229 // 2nd order alpha_s
1230 SetMSTP(2,2);
1231
1232 // QCD scales
1233 SetMSTP(32,2);
1234 SetPARP(34,1.0);
1235}
e0e89f40 1236
1237void AliPythia::AtlasTuning()
1238{
1239 //
1240 // Configuration for the ATLAS tuning
1241 SetMSTP(51, kCTEQ5L); // CTEQ5L pdf
1242 SetMSTP(81,1); // Multiple Interactions ON
1243 SetMSTP(82,4); // Double Gaussian Model
39c2e610 1244 SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
e0e89f40 1245 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1246 SetPARP(89,1000.); // [GeV] Ref. energy
1247 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1248 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1249 SetPARP(84,0.5); // Core radius
1250 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1251 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1252 SetPARP(67,1); // Regulates Initial State Radiation
1253}
e8a8adcd 1254
1255AliPythia& AliPythia::operator=(const AliPythia& rhs)
1256{
1257// Assignment operator
1258 rhs.Copy(*this);
1259 return *this;
1260}
1261
1262 void AliPythia::Copy(TObject&) const
1263{
1264 //
1265 // Copy
1266 //
1267 Fatal("Copy","Not implemented!\n");
1268}