]> git.uio.no Git - u/mrichter/AliRoot.git/blame - PYTHIA6/AliPythia.cxx
git://git.uio.no / u / mrichter / AliRoot.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
plot fixes
[u/mrichter/AliRoot.git] / PYTHIA6 / AliPythia.cxx
CommitLineData
8d2cd130 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
7cdba479 16/* $Id$ */
8d2cd130 17
18#include "AliPythia.h"
7cdba479 19#include "AliPythiaRndm.h"
12cb0bc0 20#include "AliFastGlauber.h"
21#include "AliQuenchingWeights.h"
03358a32 22#include "AliOmegaDalitz.h"
0f482ae4 23#include "TVector3.h"
03358a32 24#include "TLorentzVector.h"
12cb0bc0 25#include "PyquenCommon.h"
8d2cd130 26
27ClassImp(AliPythia)
28
29#ifndef WIN32
30# define pyclus pyclus_
31# define pycell pycell_
452af8c7 32# define pyshow pyshow_
33# define pyrobo pyrobo_
992f2843 34# define pyquen pyquen_
16a82508 35# define pyevnw pyevnw_
cd07c39b 36# define pyshowq pyshowq_
6c43eccb 37# define qpygin0 qpygin0_
694b39f9 38# define pytune pytune_
9b61ba2a 39# define py2ent py2ent_
8d2cd130 40# define type_of_call
41#else
42# define pyclus PYCLUS
43# define pycell PYCELL
452af8c7 44# define pyrobo PYROBO
992f2843 45# define pyquen PYQUEN
16a82508 46# define pyevnw PYEVNW
cd07c39b 47# define pyshowq PYSHOWQ
6c43eccb 48# define qpygin0 QPYGIN0
9b61ba2a 49# define pytune PYTUNE
50# define py2ent PY2ENT
8d2cd130 51# define type_of_call _stdcall
52#endif
53
54extern "C" void type_of_call pyclus(Int_t & );
55extern "C" void type_of_call pycell(Int_t & );
452af8c7 56extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
57extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
992f2843 58extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
0a2cfc0a 59extern "C" void type_of_call pyevnw(){;}
cd07c39b 60extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &);
694b39f9 61extern "C" void type_of_call pytune(Int_t &);
9b61ba2a 62extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&);
6c43eccb 63extern "C" void type_of_call qpygin0();
8d2cd130 64//_____________________________________________________________________________
65
66AliPythia* AliPythia::fgAliPythia=NULL;
67
e8a8adcd 68AliPythia::AliPythia():
69 fProcess(kPyMb),
70 fEcms(0.),
71 fStrucFunc(kCTEQ5L),
72 fXJet(0.),
73 fYJet(0.),
32c8e463 74 fNGmax(30),
75 fZmax(0.97),
e8a8adcd 76 fGlauber(0),
0bd3d7c5 77 fQuenchingWeights(0),
03358a32 78 fItune(-1),
79 fOmegaDalitz()
8d2cd130 80{
81// Default Constructor
82//
83// Set random number
7cdba479 84 if (!AliPythiaRndm::GetPythiaRandom())
85 AliPythiaRndm::SetPythiaRandom(GetRandom());
0f482ae4 86 fGlauber = 0;
87 fQuenchingWeights = 0;
8d2cd130 88}
89
e8a8adcd 90AliPythia::AliPythia(const AliPythia& pythia):
6b435cde 91 TPythia6(pythia),
92 AliRndm(pythia),
e8a8adcd 93 fProcess(kPyMb),
94 fEcms(0.),
95 fStrucFunc(kCTEQ5L),
96 fXJet(0.),
97 fYJet(0.),
32c8e463 98 fNGmax(30),
99 fZmax(0.97),
e8a8adcd 100 fGlauber(0),
0bd3d7c5 101 fQuenchingWeights(0),
03358a32 102 fItune(-1),
103 fOmegaDalitz()
e8a8adcd 104{
105 // Copy Constructor
106 pythia.Copy(*this);
107}
108
efe3b1cd 109void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune)
8d2cd130 110{
111// Initialise the process to generate
7cdba479 112 if (!AliPythiaRndm::GetPythiaRandom())
113 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 114
0bd3d7c5 115 fItune = itune;
116
8d2cd130 117 fProcess = process;
118 fEcms = energy;
119 fStrucFunc = strucfunc;
1d5b1b20 120//...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
e2de0ce1 121 SetMDCY(Pycomp(111) ,1,0); // pi0
122 SetMDCY(Pycomp(310) ,1,0); // K0S
123 SetMDCY(Pycomp(3122),1,0); // kLambda
124 SetMDCY(Pycomp(3112),1,0); // sigma -
e2de0ce1 125 SetMDCY(Pycomp(3222),1,0); // sigma +
126 SetMDCY(Pycomp(3312),1,0); // xi -
127 SetMDCY(Pycomp(3322),1,0); // xi 0
128 SetMDCY(Pycomp(3334),1,0); // omega-
1c50ec12 129 // Select structure function
8d2cd130 130 SetMSTP(52,2);
e2de0ce1 131 SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
1c50ec12 132 // Particles produced in string fragmentation point directly to either of the two endpoints
133 // of the string (depending in the side they were generated from).
134 SetMSTU(16,2);
135
8d2cd130 136//
137// Pythia initialisation for selected processes//
138//
139// Make MSEL clean
140//
141 for (Int_t i=1; i<= 200; i++) {
142 SetMSUB(i,0);
143 }
144// select charm production
145 switch (process)
146 {
65f2626c 147 case kPyOldUEQ2ordered: //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(90,0.25);
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 kPyOldUEQ2ordered2:
169// Old underlying events with Q2 ordered QCD processes
170// Multiple interactions on.
171 SetMSTP(81,1);
172// Double Gaussian matter distribution.
173 SetMSTP(82,4);
174 SetPARP(83,0.5);
175 SetPARP(84,0.4);
176// pT0.
177 SetPARP(82,2.0);
178// Reference energy for pT0 and energy rescaling pace.
179 SetPARP(89,1800);
180 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
181// String drawing almost completely minimizes string length.
182 SetPARP(85,0.9);
183 SetPARP(86,0.95);
184// ISR and FSR activity.
185 SetPARP(67,4);
186 SetPARP(71,4);
187// Lambda_FSR scale.
188 SetPARJ(81,0.29);
189 break;
190 case kPyOldPopcorn:
191// Old production mechanism: Old Popcorn
192 SetMSEL(1);
193 SetMSTJ(12,3);
194// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
195 SetMSTP(88,2);
196// (D=1)see can be used to form baryons (BARYON JUNCTION)
197 SetMSTJ(1,1);
e0e89f40 198 AtlasTuning();
65f2626c 199 break;
8d2cd130 200 case kPyCharm:
201 SetMSEL(4);
8d2cd130 202// heavy quark masses
203
204 SetPMAS(4,1,1.2);
8d2cd130 205//
206// primordial pT
207 SetMSTP(91,1);
208 SetPARP(91,1.);
209 SetPARP(93,5.);
210//
211 break;
212 case kPyBeauty:
213 SetMSEL(5);
214 SetPMAS(5,1,4.75);
8d2cd130 215 break;
216 case kPyJpsi:
217 SetMSEL(0);
218// gg->J/Psi g
219 SetMSUB(86,1);
220 break;
221 case kPyJpsiChi:
222 SetMSEL(0);
223// gg->J/Psi g
224 SetMSUB(86,1);
225// gg-> chi_0c g
226 SetMSUB(87,1);
227// gg-> chi_1c g
228 SetMSUB(88,1);
229// gg-> chi_2c g
230 SetMSUB(89,1);
231 break;
232 case kPyCharmUnforced:
233 SetMSEL(0);
234// gq->qg
235 SetMSUB(28,1);
236// gg->qq
237 SetMSUB(53,1);
238// gg->gg
239 SetMSUB(68,1);
240 break;
241 case kPyBeautyUnforced:
242 SetMSEL(0);
243// gq->qg
244 SetMSUB(28,1);
245// gg->qq
246 SetMSUB(53,1);
247// gg->gg
248 SetMSUB(68,1);
249 break;
250 case kPyMb:
251// Minimum Bias pp-Collisions
252//
253//
254// select Pythia min. bias model
255 SetMSEL(0);
511db649 256 SetMSUB(92,1); // single diffraction AB-->XB
257 SetMSUB(93,1); // single diffraction AB-->AX
258 SetMSUB(94,1); // double diffraction
259 SetMSUB(95,1); // low pt production
260
e0e89f40 261 AtlasTuning();
f529e69b 262 break;
0bd3d7c5 263
264 case kPyMbAtlasTuneMC09:
265// Minimum Bias pp-Collisions
266//
267//
268// select Pythia min. bias model
269 SetMSEL(0);
270 SetMSUB(92,1); // single diffraction AB-->XB
271 SetMSUB(93,1); // single diffraction AB-->AX
272 SetMSUB(94,1); // double diffraction
273 SetMSUB(95,1); // low pt production
274
275 AtlasTuning_MC09();
276 break;
04081a91 277
278 case kPyMbWithDirectPhoton:
279// Minimum Bias pp-Collisions with direct photon processes added
280//
281//
282// select Pythia min. bias model
283 SetMSEL(0);
284 SetMSUB(92,1); // single diffraction AB-->XB
285 SetMSUB(93,1); // single diffraction AB-->AX
286 SetMSUB(94,1); // double diffraction
287 SetMSUB(95,1); // low pt production
288
289 SetMSUB(14,1); //
290 SetMSUB(18,1); //
291 SetMSUB(29,1); //
292 SetMSUB(114,1); //
293 SetMSUB(115,1); //
294
295
296 AtlasTuning();
297 break;
298
f529e69b 299 case kPyMbDefault:
300// Minimum Bias pp-Collisions
301//
302//
303// select Pythia min. bias model
304 SetMSEL(0);
6d2ec66d 305 SetMSUB(92,1); // single diffraction AB-->XB
306 SetMSUB(93,1); // single diffraction AB-->AX
f529e69b 307 SetMSUB(94,1); // double diffraction
308 SetMSUB(95,1); // low pt production
0a0cbcfd 309 break;
310 case kPyLhwgMb:
311// Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
312// -> Pythia 6.3 or above is needed
313//
314 SetMSEL(0);
315 SetMSUB(92,1); // single diffraction AB-->XB
316 SetMSUB(93,1); // single diffraction AB-->AX
317 SetMSUB(94,1); // double diffraction
318 SetMSUB(95,1); // low pt production
319
e2de0ce1 320 SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf
0a0cbcfd 321 SetMSTP(52,2);
322 SetMSTP(68,1);
323 SetMSTP(70,2);
324 SetMSTP(81,1); // Multiple Interactions ON
325 SetMSTP(82,4); // Double Gaussian Model
326 SetMSTP(88,1);
327
328 SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
329 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
330 SetPARP(84,0.5); // Core radius
331 SetPARP(85,0.9); // Regulates gluon prod. mechanism
332 SetPARP(90,0.2); // 2*epsilon (exponent in power law)
333
511db649 334 break;
8d2cd130 335 case kPyMbNonDiffr:
336// Minimum Bias pp-Collisions
337//
338//
339// select Pythia min. bias model
340 SetMSEL(0);
511db649 341 SetMSUB(95,1); // low pt production
0f482ae4 342
d7de4a67 343 AtlasTuning();
344 break;
345 case kPyMbMSEL1:
346 ConfigHeavyFlavor();
347// Intrinsic <kT^2>
348 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
349 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
350 SetPARP(93,5.); // Upper cut-off
351// Set Q-quark mass
352 SetPMAS(4,1,1.2); // Charm quark mass
353 SetPMAS(5,1,4.78); // Beauty quark mass
354 SetPARP(71,4.); // Defaut value
355// Atlas Tuning
e0e89f40 356 AtlasTuning();
8d2cd130 357 break;
358 case kPyJets:
359//
360// QCD Jets
361//
362 SetMSEL(1);
65f2626c 363 // Pythia Tune A (CDF)
364 //
4167b79f 365 SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
65f2626c 366 SetMSTP(82,4); // Double Gaussian Model
367 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
368 SetPARP(84,0.4); // Core radius
369 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
370 SetPARP(86,0.95); // Regulates gluon prod. mechanism
371 SetPARP(89,1800.); // [GeV] Ref. energy
0bd3d7c5 372 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
65f2626c 373 break;
8d2cd130 374 case kPyDirectGamma:
375 SetMSEL(10);
376 break;
adf4d898 377 case kPyCharmPbPbMNR:
378 case kPyD0PbPbMNR:
90d7b703 379 case kPyDPlusPbPbMNR:
e0e89f40 380 case kPyDPlusStrangePbPbMNR:
90d7b703 381 // Tuning of Pythia parameters aimed to get a resonable agreement
382 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
383 // c-cbar single inclusive and double differential distributions.
384 // This parameter settings are meant to work with Pb-Pb collisions
385 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
386 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
387 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 388 ConfigHeavyFlavor();
90d7b703 389 // Intrinsic <kT>
390 SetMSTP(91,1);
391 SetPARP(91,1.304);
392 SetPARP(93,6.52);
90d7b703 393 // Set c-quark mass
394 SetPMAS(4,1,1.2);
8d2cd130 395 break;
adf4d898 396 case kPyCharmpPbMNR:
397 case kPyD0pPbMNR:
90d7b703 398 case kPyDPluspPbMNR:
e0e89f40 399 case kPyDPlusStrangepPbMNR:
90d7b703 400 // Tuning of Pythia parameters aimed to get a resonable agreement
401 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
402 // c-cbar single inclusive and double differential distributions.
403 // This parameter settings are meant to work with p-Pb collisions
404 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
405 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
406 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 407 ConfigHeavyFlavor();
90d7b703 408 // Intrinsic <kT>
3dc3ec94 409 SetMSTP(91,1);
410 SetPARP(91,1.16);
411 SetPARP(93,5.8);
412
90d7b703 413 // Set c-quark mass
3dc3ec94 414 SetPMAS(4,1,1.2);
adf4d898 415 break;
416 case kPyCharmppMNR:
417 case kPyD0ppMNR:
90d7b703 418 case kPyDPlusppMNR:
e0e89f40 419 case kPyDPlusStrangeppMNR:
90d7b703 420 // Tuning of Pythia parameters aimed to get a resonable agreement
421 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
422 // c-cbar single inclusive and double differential distributions.
423 // This parameter settings are meant to work with pp collisions
424 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
425 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
426 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 427 ConfigHeavyFlavor();
90d7b703 428 // Intrinsic <kT^2>
3dc3ec94 429 SetMSTP(91,1);
430 SetPARP(91,1.);
431 SetPARP(93,5.);
432
90d7b703 433 // Set c-quark mass
3dc3ec94 434 SetPMAS(4,1,1.2);
adf4d898 435 break;
e0e89f40 436 case kPyCharmppMNRwmi:
437 // Tuning of Pythia parameters aimed to get a resonable agreement
438 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
439 // c-cbar single inclusive and double differential distributions.
440 // This parameter settings are meant to work with pp collisions
441 // and with kCTEQ5L PDFs.
442 // Added multiple interactions according to ATLAS tune settings.
443 // To get a "reasonable" agreement with MNR results, events have to be
444 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
445 // set to 2.76 GeV.
446 // To get a "perfect" agreement with MNR results, events have to be
447 // generated in four ptHard bins with the following relative
448 // normalizations:
449 // 2.76-3 GeV: 25%
450 // 3-4 GeV: 40%
451 // 4-8 GeV: 29%
452 // >8 GeV: 6%
453 ConfigHeavyFlavor();
454 // Intrinsic <kT^2>
455 SetMSTP(91,1);
456 SetPARP(91,1.);
457 SetPARP(93,5.);
458
459 // Set c-quark mass
460 SetPMAS(4,1,1.2);
461 AtlasTuning();
462 break;
adf4d898 463 case kPyBeautyPbPbMNR:
8d2cd130 464 // Tuning of Pythia parameters aimed to get a resonable agreement
465 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
466 // b-bbar single inclusive and double differential distributions.
467 // This parameter settings are meant to work with Pb-Pb collisions
468 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
469 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
470 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 471 ConfigHeavyFlavor();
8d2cd130 472 // QCD scales
3dc3ec94 473 SetPARP(67,1.0);
474 SetPARP(71,1.0);
adf4d898 475 // Intrinsic <kT>
3dc3ec94 476 SetMSTP(91,1);
477 SetPARP(91,2.035);
478 SetPARP(93,10.17);
8d2cd130 479 // Set b-quark mass
3dc3ec94 480 SetPMAS(5,1,4.75);
adf4d898 481 break;
482 case kPyBeautypPbMNR:
483 // Tuning of Pythia parameters aimed to get a resonable agreement
484 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
485 // b-bbar single inclusive and double differential distributions.
486 // This parameter settings are meant to work with p-Pb collisions
487 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
488 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
489 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 490 ConfigHeavyFlavor();
adf4d898 491 // QCD scales
3dc3ec94 492 SetPARP(67,1.0);
493 SetPARP(71,1.0);
adf4d898 494 // Intrinsic <kT>
3dc3ec94 495 SetMSTP(91,1);
496 SetPARP(91,1.60);
497 SetPARP(93,8.00);
adf4d898 498 // Set b-quark mass
3dc3ec94 499 SetPMAS(5,1,4.75);
adf4d898 500 break;
501 case kPyBeautyppMNR:
502 // Tuning of Pythia parameters aimed to get a resonable agreement
503 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
504 // b-bbar single inclusive and double differential distributions.
505 // This parameter settings are meant to work with pp collisions
506 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
507 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
508 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 509 ConfigHeavyFlavor();
adf4d898 510 // QCD scales
3dc3ec94 511 SetPARP(67,1.0);
512 SetPARP(71,1.0);
513
514 // Intrinsic <kT>
515 SetMSTP(91,1);
516 SetPARP(91,1.);
517 SetPARP(93,5.);
518
519 // Set b-quark mass
520 SetPMAS(5,1,4.75);
8d2cd130 521 break;
9dfe63b3 522 case kPyBeautyJets:
e0e89f40 523 case kPyBeautyppMNRwmi:
524 // Tuning of Pythia parameters aimed to get a resonable agreement
525 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
526 // b-bbar single inclusive and double differential distributions.
527 // This parameter settings are meant to work with pp collisions
528 // and with kCTEQ5L PDFs.
529 // Added multiple interactions according to ATLAS tune settings.
530 // To get a "reasonable" agreement with MNR results, events have to be
531 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
532 // set to 2.76 GeV.
533 // To get a "perfect" agreement with MNR results, events have to be
534 // generated in four ptHard bins with the following relative
535 // normalizations:
536 // 2.76-4 GeV: 5%
537 // 4-6 GeV: 31%
538 // 6-8 GeV: 28%
539 // >8 GeV: 36%
540 ConfigHeavyFlavor();
541 // QCD scales
542 SetPARP(67,1.0);
543 SetPARP(71,1.0);
544
545 // Intrinsic <kT>
546 SetMSTP(91,1);
547 SetPARP(91,1.);
548 SetPARP(93,5.);
549
550 // Set b-quark mass
551 SetPMAS(5,1,4.75);
552
553 AtlasTuning();
554 break;
589380c6 555 case kPyW:
556
557 //Inclusive production of W+/-
558 SetMSEL(0);
559 //f fbar -> W+
560 SetMSUB(2,1);
561 // //f fbar -> g W+
562 // SetMSUB(16,1);
563 // //f fbar -> gamma W+
564 // SetMSUB(20,1);
565 // //f g -> f W+
566 // SetMSUB(31,1);
567 // //f gamma -> f W+
568 // SetMSUB(36,1);
569
570 // Initial/final parton shower on (Pythia default)
571 // With parton showers on we are generating "W inclusive process"
572 SetMSTP(61,1); //Initial QCD & QED showers on
573 SetMSTP(71,1); //Final QCD & QED showers on
574
575 break;
0f6ee828 576
577 case kPyZ:
578
579 //Inclusive production of Z
580 SetMSEL(0);
581 //f fbar -> Z/gamma
582 SetMSUB(1,1);
583
584 // // f fbar -> g Z/gamma
585 // SetMSUB(15,1);
586 // // f fbar -> gamma Z/gamma
587 // SetMSUB(19,1);
588 // // f g -> f Z/gamma
589 // SetMSUB(30,1);
590 // // f gamma -> f Z/gamma
591 // SetMSUB(35,1);
592
593 //only Z included, not gamma
594 SetMSTP(43,2);
595
596 // Initial/final parton shower on (Pythia default)
597 // With parton showers on we are generating "Z inclusive process"
598 SetMSTP(61,1); //Initial QCD & QED showers on
599 SetMSTP(71,1); //Final QCD & QED showers on
600
601 break;
602
8d2cd130 603 }
604//
605// Initialize PYTHIA
efe3b1cd 606//
607// Select the tune
608 if (itune > -1) Pytune(itune);
609
610//
8d2cd130 611 SetMSTP(41,1); // all resonance decays switched on
d95b55fa 612 Initialize("CMS","p","p",fEcms);
03358a32 613 fOmegaDalitz.Init();
8d2cd130 614}
615
616Int_t AliPythia::CheckedLuComp(Int_t kf)
617{
618// Check Lund particle code (for debugging)
619 Int_t kc=Pycomp(kf);
620 printf("\n Lucomp kf,kc %d %d",kf,kc);
621 return kc;
622}
623
20e47f08 624void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf)
8d2cd130 625{
626// Treat protons as inside nuclei with mass numbers a1 and a2
627// The MSTP array in the PYPARS common block is used to enable and
628// select the nuclear structure functions.
629// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
630// =1: internal PYTHIA acording to MSTP(51)
631// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
632// If the following mass number both not equal zero, nuclear corrections of the stf are used.
633// MSTP(192) : Mass number of nucleus side 1
634// MSTP(193) : Mass number of nucleus side 2
20e47f08 635// MSTP(194) : Nuclear structure function: 0: EKS98 1:EPS08
8d2cd130 636 SetMSTP(52,2);
637 SetMSTP(192, a1);
20e47f08 638 SetMSTP(193, a2);
639 SetMSTP(194, pdf);
8d2cd130 640}
641
642
643AliPythia* AliPythia::Instance()
644{
645// Set random number generator
646 if (fgAliPythia) {
647 return fgAliPythia;
648 } else {
649 fgAliPythia = new AliPythia();
650 return fgAliPythia;
651 }
652}
653
654void AliPythia::PrintParticles()
655{
656// Print list of particl properties
657 Int_t np = 0;
c31f1d37 658 char* name = new char[16];
8d2cd130 659 for (Int_t kf=0; kf<1000000; kf++) {
660 for (Int_t c = 1; c > -2; c-=2) {
8d2cd130 661 Int_t kc = Pycomp(c*kf);
662 if (kc) {
663 Float_t mass = GetPMAS(kc,1);
664 Float_t width = GetPMAS(kc,2);
665 Float_t tau = GetPMAS(kc,4);
c31f1d37 666
8d2cd130 667 Pyname(kf,name);
668
669 np++;
670
671 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
672 c*kf, name, mass, width, tau);
673 }
674 }
675 }
676 printf("\n Number of particles %d \n \n", np);
677}
678
679void AliPythia::ResetDecayTable()
680{
681// Set default values for pythia decay switches
682 Int_t i;
683 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
684 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
685}
686
687void AliPythia::SetDecayTable()
688{
689// Set default values for pythia decay switches
690//
691 Int_t i;
692 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
693 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
694}
695
696void AliPythia::Pyclus(Int_t& njet)
697{
698// Call Pythia clustering algorithm
699//
700 pyclus(njet);
701}
702
703void AliPythia::Pycell(Int_t& njet)
704{
705// Call Pythia jet reconstruction algorithm
706//
707 pycell(njet);
708}
709
452af8c7 710void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
711{
712// Call Pythia jet reconstruction algorithm
713//
452af8c7 714 pyshow(ip1, ip2, qmax);
715}
716
717void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
718{
719 pyrobo(imi, ima, the, phi, bex, bey, bez);
720}
721
694b39f9 722void AliPythia::Pytune(Int_t itune)
723{
c5e2801a 724/*
725C
726C ITUNE NAME (detailed descriptions below)
727C 0 Default : No settings changed => linked Pythia version's defaults.
728C ====== Old UE, Q2-ordered showers ==========================================
729C 100 A : Rick Field's CDF Tune A
730C 101 AW : Rick Field's CDF Tune AW
731C 102 BW : Rick Field's CDF Tune BW
732C 103 DW : Rick Field's CDF Tune DW
733C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling
734C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally)
735C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome)
736C 107 ACR : Tune A modified with annealing CR
737C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally)
738C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally)
739C ====== Intermediate Models =================================================
740C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR
741C 201 APT : Tune A modified to use pT-ordered final-state showers
742C ====== New UE, interleaved pT-ordered showers, annealing CR ================
743C 300 S0 : Sandhoff-Skands Tune 0
744C 301 S1 : Sandhoff-Skands Tune 1
745C 302 S2 : Sandhoff-Skands Tune 2
746C 303 S0A : S0 with "Tune A" UE energy scaling
747C 304 NOCR : New UE "best try" without colour reconnections
748C 305 Old : New UE, original (primitive) colour reconnections
749C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally)
750C ======= The Uppsala models =================================================
751C ( NB! must be run with special modified Pythia 6.215 version )
752C ( available from http://www.isv.uu.se/thep/MC/scigal/ )
753C 400 GAL 0 : Generalized area-law model. Old parameters
754C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters
755C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands)
756*/
694b39f9 757 pytune(itune);
758}
759
9b61ba2a 760void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){
761 // Inset 2-parton system at line idx
762 py2ent(idx, pdg1, pdg2, p);
763}
452af8c7 764
765
32c8e463 766void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax)
0f482ae4 767{
768// Initializes
769// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
770// (2) The nuclear geometry using the Glauber Model
771//
6b435cde 772
18b7a4a1 773 fGlauber = AliFastGlauber::Instance();
0f482ae4 774 fGlauber->Init(2);
775 fGlauber->SetCentralityClass(cMin, cMax);
776
777 fQuenchingWeights = new AliQuenchingWeights();
778 fQuenchingWeights->InitMult();
86b6ad68 779 fQuenchingWeights->SetK(k);
0f482ae4 780 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
32c8e463 781 fNGmax = ngmax;
782 fZmax = zmax;
783
0f482ae4 784}
785
786
452af8c7 787void AliPythia::Quench()
788{
789//
790//
791// Simple Jet Quenching routine:
792// =============================
793// The jet formed by all final state partons radiated by the parton created
0f482ae4 794// in the hard collisions is quenched by a factor (1-z) using light cone variables in
795// the initial parton reference frame:
452af8c7 796// (E + p_z)new = (1-z) (E + p_z)old
797//
0f482ae4 798//
799//
800//
452af8c7 801// The lost momentum is first balanced by one gluon with virtuality > 0.
802// Subsequently the gluon splits to yield two gluons with E = p.
803//
0f482ae4 804//
805//
4e383037 806 static Float_t eMean = 0.;
807 static Int_t icall = 0;
0f482ae4 808
c2c598a3 809 Double_t p0[4][5];
810 Double_t p1[4][5];
811 Double_t p2[4][5];
812 Int_t klast[4] = {-1, -1, -1, -1};
452af8c7 813
814 Int_t numpart = fPyjets->N;
86b6ad68 815 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
c2c598a3 816 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
817 Bool_t quenched[4];
b280c4cc 818 Double_t wjtKick[4];
c2c598a3 819 Int_t nGluon[4];
86b6ad68 820 Int_t qPdg[4];
0f482ae4 821 Int_t imo, kst, pdg;
b280c4cc 822
511db649 823//
c2c598a3 824// Sore information about Primary partons
825//
826// j =
827// 0, 1 partons from hard scattering
828// 2, 3 partons from initial state radiation
829//
830 for (Int_t i = 2; i <= 7; i++) {
831 Int_t j = 0;
832 // Skip gluons that participate in hard scattering
833 if (i == 4 || i == 5) continue;
834 // Gluons from hard Scattering
835 if (i == 6 || i == 7) {
836 j = i - 6;
837 pxq[j] = fPyjets->P[0][i];
838 pyq[j] = fPyjets->P[1][i];
839 pzq[j] = fPyjets->P[2][i];
840 eq[j] = fPyjets->P[3][i];
841 mq[j] = fPyjets->P[4][i];
842 } else {
843 // Gluons from initial state radiation
844 //
845 // Obtain 4-momentum vector from difference between original parton and parton after gluon
846 // radiation. Energy is calculated independently because initial state radition does not
847 // conserve strictly momentum and energy for each partonic system independently.
848 //
849 // Not very clean. Should be improved !
850 //
851 //
852 j = i;
853 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
854 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
855 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
856 mq[j] = fPyjets->P[4][i];
857 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
858 }
859//
860// Calculate some kinematic variables
511db649 861//
4e383037 862 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
0f482ae4 863 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
864 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
865 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
866 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
86b6ad68 867 qPdg[j] = fPyjets->K[1][i];
868 }
869
870 Double_t int0[4];
871 Double_t int1[4];
86b6ad68 872
b280c4cc 873 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
874
86b6ad68 875 for (Int_t j = 0; j < 4; j++) {
c2c598a3 876 //
877 // Quench only central jets and with E > 10.
878 //
86b6ad68 879
880
881 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
882 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
883
c2c598a3 884 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
b280c4cc 885 fZQuench[j] = 0.;
0f482ae4 886 } else {
c2c598a3 887 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
4e383037 888 icall ++;
889 eMean += eloss;
890 }
0f482ae4 891 //
892 // Extra pt
86b6ad68 893 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
894 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
0f482ae4 895 //
896 // Fractional energy loss
b280c4cc 897 fZQuench[j] = eloss / eq[j];
0f482ae4 898 //
899 // Avoid complete loss
900 //
1044c4d8 901 if (fZQuench[j] > fZmax) fZQuench[j] = fZmax;
0f482ae4 902 //
903 // Some debug printing
86b6ad68 904
905
bf9bb016 906// 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",
907// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
4e383037 908
b280c4cc 909// fZQuench[j] = 0.8;
910// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
0f482ae4 911 }
4e383037 912
b280c4cc 913 quenched[j] = (fZQuench[j] > 0.01);
4e383037 914 } // primary partons
c2c598a3 915
b280c4cc 916
917
6e90ad26 918 Double_t pNew[1000][4];
919 Int_t kNew[1000];
920 Int_t icount = 0;
b280c4cc 921 Double_t zquench[4];
922
6e90ad26 923//
4e383037 924// System Loop
c2c598a3 925 for (Int_t isys = 0; isys < 4; isys++) {
6e90ad26 926// Skip to next system if not quenched.
4e383037 927 if (!quenched[isys]) continue;
928
b280c4cc 929 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
32c8e463 930 if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax;
b280c4cc 931 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
4e383037 932 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
0f482ae4 933
4e383037 934
935
936 Int_t igMin = -1;
937 Int_t igMax = -1;
938 Double_t pg[4] = {0., 0., 0., 0.};
939
940//
941// Loop on radiation events
942
943 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
6e90ad26 944 while (1) {
945 icount = 0;
946 for (Int_t k = 0; k < 4; k++)
947 {
948 p0[isys][k] = 0.;
949 p1[isys][k] = 0.;
950 p2[isys][k] = 0.;
951 }
952// Loop over partons
953 for (Int_t i = 0; i < numpart; i++)
954 {
955 imo = fPyjets->K[2][i];
956 kst = fPyjets->K[0][i];
957 pdg = fPyjets->K[1][i];
958
959
960
0f482ae4 961// Quarks and gluons only
6e90ad26 962 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
0f482ae4 963// Particles from hard scattering only
c2c598a3 964
6e90ad26 965 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
c2c598a3 966 Int_t imom = imo % 1000;
967 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
968 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
969
6e90ad26 970
0f482ae4 971// Skip comment lines
6e90ad26 972 if (kst != 1 && kst != 2) continue;
0f482ae4 973//
974// Parton kinematic
6e90ad26 975 px = fPyjets->P[0][i];
976 py = fPyjets->P[1][i];
977 pz = fPyjets->P[2][i];
978 e = fPyjets->P[3][i];
979 m = fPyjets->P[4][i];
980 pt = TMath::Sqrt(px * px + py * py);
981 p = TMath::Sqrt(px * px + py * py + pz * pz);
982 phi = TMath::Pi() + TMath::ATan2(-py, -px);
983 theta = TMath::ATan2(pt, pz);
984
0f482ae4 985//
c2c598a3 986// Save 4-momentum sum for balancing
987 Int_t index = isys;
6e90ad26 988
989 p0[index][0] += px;
990 p0[index][1] += py;
991 p0[index][2] += pz;
992 p0[index][3] += e;
6e90ad26 993
994 klast[index] = i;
995
0f482ae4 996//
997// Fractional energy loss
b280c4cc 998 Double_t z = zquench[index];
4e383037 999
c2c598a3 1000
4e383037 1001// Don't fully quench radiated gluons
1002//
1003 if (imo > 1000) {
1004// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
1005//
1006
c2c598a3 1007 z = 0.02;
4e383037 1008 }
c2c598a3 1009// printf("z: %d %f\n", imo, z);
1010
4e383037 1011
1012//
6e90ad26 1013
1014 //
1015 //
1016 // Transform into frame in which initial parton is along z-axis
1017 //
1018 TVector3 v(px, py, pz);
1019 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
1020 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
1021
1022 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
1023 Double_t mt2 = jt * jt + m * m;
1024 Double_t zmax = 1.;
1025 //
1026 // Kinematic limit on z
1027 //
4e383037 1028 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
6e90ad26 1029 //
1030 // Change light-cone kinematics rel. to initial parton
1031 //
1032 Double_t eppzOld = e + pl;
1033 Double_t empzOld = e - pl;
1034
1035 Double_t eppzNew = (1. - z) * eppzOld;
1036 Double_t empzNew = empzOld - mt2 * z / eppzOld;
1037 Double_t eNew = 0.5 * (eppzNew + empzNew);
1038 Double_t plNew = 0.5 * (eppzNew - empzNew);
1039
1040 Double_t jtNew;
1041 //
1042 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
1043 Double_t mt2New = eppzNew * empzNew;
1044 if (mt2New < 1.e-8) mt2New = 0.;
4e383037 1045 if (z < zmax) {
1046 if (m * m > mt2New) {
1047 //
1048 // This should not happen
1049 //
1050 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
1051 jtNew = 0;
1052 } else {
1053 jtNew = TMath::Sqrt(mt2New - m * m);
1054 }
6e90ad26 1055 } else {
4e383037 1056 // If pT is to small (probably a leading massive particle) we scale only the energy
1057 // This can cause negative masses of the radiated gluon
1058 // Let's hope for the best ...
1059 jtNew = jt;
1060 eNew = TMath::Sqrt(plNew * plNew + mt2);
1061
6e90ad26 1062 }
6e90ad26 1063 //
1064 // Calculate new px, py
1065 //
b07be423 1066 Double_t pxNew = 0;
1067 Double_t pyNew = 0;
6e90ad26 1068
b07be423 1069 if (jt>0) {
6b118b3c 1070 pxNew = jtNew / jt * pxs;
1071 pyNew = jtNew / jt * pys;
b07be423 1072 }
6e90ad26 1073// Double_t dpx = pxs - pxNew;
1074// Double_t dpy = pys - pyNew;
1075// Double_t dpz = pl - plNew;
1076// Double_t de = e - eNew;
1077// Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
1078// printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
1079// printf("New mass (2) %e %e \n", pxNew, pyNew);
1080 //
1081 // Rotate back
1082 //
1083 TVector3 w(pxNew, pyNew, plNew);
1084 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
1085 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
1086
1087 p1[index][0] += pxNew;
1088 p1[index][1] += pyNew;
1089 p1[index][2] += plNew;
1090 p1[index][3] += eNew;
1091 //
1092 // Updated 4-momentum vectors
1093 //
1094 pNew[icount][0] = pxNew;
1095 pNew[icount][1] = pyNew;
1096 pNew[icount][2] = plNew;
1097 pNew[icount][3] = eNew;
1098 kNew[icount] = i;
1099 icount++;
1100 } // parton loop
0f482ae4 1101 //
6e90ad26 1102 // Check if there was phase-space for quenching
0f482ae4 1103 //
0f482ae4 1104
6e90ad26 1105 if (icount == 0) quenched[isys] = kFALSE;
1106 if (!quenched[isys]) break;
1107
1108 for (Int_t j = 0; j < 4; j++)
1109 {
1110 p2[isys][j] = p0[isys][j] - p1[isys][j];
1111 }
1112 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 1113 if (p2[isys][4] > 0.) {
1114 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
1115 break;
1116 } else {
b280c4cc 1117 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
4e383037 1118 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 1119 if (p2[isys][4] < -0.01) {
4e383037 1120 printf("Negative mass squared !\n");
1121 // Here we have to put the gluon back to mass shell
1122 // This will lead to a small energy imbalance
1123 p2[isys][4] = 0.;
1124 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1125 break;
6e90ad26 1126 } else {
1127 p2[isys][4] = 0.;
1128 break;
1129 }
1130 }
6e90ad26 1131 /*
6e90ad26 1132 zHeavy *= 0.98;
1133 printf("zHeavy lowered to %f\n", zHeavy);
1134 if (zHeavy < 0.01) {
1135 printf("No success ! \n");
1136 icount = 0;
1137 quenched[isys] = kFALSE;
1138 break;
1139 }
4e383037 1140 */
1141 } // iteration on z (while)
1142
6e90ad26 1143// Update event record
1144 for (Int_t k = 0; k < icount; k++) {
1145// 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] );
1146 fPyjets->P[0][kNew[k]] = pNew[k][0];
1147 fPyjets->P[1][kNew[k]] = pNew[k][1];
1148 fPyjets->P[2][kNew[k]] = pNew[k][2];
1149 fPyjets->P[3][kNew[k]] = pNew[k][3];
0f482ae4 1150 }
4e383037 1151 //
1152 // Add the gluons
1153 //
1154 Int_t ish = 0;
1837e95c 1155 Int_t iGlu;
4e383037 1156 if (!quenched[isys]) continue;
0f482ae4 1157//
1158// Last parton from shower i
4e383037 1159 Int_t in = klast[isys];
0f482ae4 1160//
1161// Continue if no parton in shower i selected
1162 if (in == -1) continue;
1163//
1164// If this is the second initial parton and it is behind the first move pointer by previous ish
4e383037 1165 if (isys == 1 && klast[1] > klast[0]) in += ish;
0f482ae4 1166//
1167// Starting index
452af8c7 1168
4e383037 1169// jmin = in - 1;
0f482ae4 1170// How many additional gluons will be generated
1171 ish = 1;
4e383037 1172 if (p2[isys][4] > 0.05) ish = 2;
0f482ae4 1173//
1174// Position of gluons
4e383037 1175 iGlu = numpart;
1176 if (iglu == 0) igMin = iGlu;
1177 igMax = iGlu;
0f482ae4 1178 numpart += ish;
1179 (fPyjets->N) += ish;
4e383037 1180
0f482ae4 1181 if (ish == 1) {
4e383037 1182 fPyjets->P[0][iGlu] = p2[isys][0];
1183 fPyjets->P[1][iGlu] = p2[isys][1];
1184 fPyjets->P[2][iGlu] = p2[isys][2];
1185 fPyjets->P[3][iGlu] = p2[isys][3];
1186 fPyjets->P[4][iGlu] = p2[isys][4];
0f482ae4 1187
4e383037 1188 fPyjets->K[0][iGlu] = 1;
1189 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
0f482ae4 1190 fPyjets->K[1][iGlu] = 21;
4e383037 1191 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1192 fPyjets->K[3][iGlu] = -1;
1193 fPyjets->K[4][iGlu] = -1;
4e383037 1194
1195 pg[0] += p2[isys][0];
1196 pg[1] += p2[isys][1];
1197 pg[2] += p2[isys][2];
1198 pg[3] += p2[isys][3];
0f482ae4 1199 } else {
1200 //
1201 // Split gluon in rest frame.
1202 //
4e383037 1203 Double_t bx = p2[isys][0] / p2[isys][3];
1204 Double_t by = p2[isys][1] / p2[isys][3];
1205 Double_t bz = p2[isys][2] / p2[isys][3];
1206 Double_t pst = p2[isys][4] / 2.;
0f482ae4 1207 //
1208 // Isotropic decay ????
1209 Double_t cost = 2. * gRandom->Rndm() - 1.;
60e55aee 1210 Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost));
2ab330c9 1211 Double_t phis = 2. * TMath::Pi() * gRandom->Rndm();
0f482ae4 1212
1213 Double_t pz1 = pst * cost;
1214 Double_t pz2 = -pst * cost;
1215 Double_t pt1 = pst * sint;
1216 Double_t pt2 = -pst * sint;
2ab330c9 1217 Double_t px1 = pt1 * TMath::Cos(phis);
1218 Double_t py1 = pt1 * TMath::Sin(phis);
1219 Double_t px2 = pt2 * TMath::Cos(phis);
1220 Double_t py2 = pt2 * TMath::Sin(phis);
0f482ae4 1221
1222 fPyjets->P[0][iGlu] = px1;
1223 fPyjets->P[1][iGlu] = py1;
1224 fPyjets->P[2][iGlu] = pz1;
1225 fPyjets->P[3][iGlu] = pst;
1226 fPyjets->P[4][iGlu] = 0.;
1227
4e383037 1228 fPyjets->K[0][iGlu] = 1 ;
0f482ae4 1229 fPyjets->K[1][iGlu] = 21;
4e383037 1230 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1231 fPyjets->K[3][iGlu] = -1;
1232 fPyjets->K[4][iGlu] = -1;
1233
1234 fPyjets->P[0][iGlu+1] = px2;
1235 fPyjets->P[1][iGlu+1] = py2;
1236 fPyjets->P[2][iGlu+1] = pz2;
1237 fPyjets->P[3][iGlu+1] = pst;
1238 fPyjets->P[4][iGlu+1] = 0.;
1239
4e383037 1240 fPyjets->K[0][iGlu+1] = 1;
1241 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
0f482ae4 1242 fPyjets->K[1][iGlu+1] = 21;
4e383037 1243 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
0f482ae4 1244 fPyjets->K[3][iGlu+1] = -1;
1245 fPyjets->K[4][iGlu+1] = -1;
1246 SetMSTU(1,0);
1247 SetMSTU(2,0);
1248 //
1249 // Boost back
1250 //
1251 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1252 }
4e383037 1253/*
1254 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1255 Double_t px, py, pz;
1256 px = fPyjets->P[0][ig];
1257 py = fPyjets->P[1][ig];
1258 pz = fPyjets->P[2][ig];
1259 TVector3 v(px, py, pz);
1260 v.RotateZ(-phiq[isys]);
1261 v.RotateY(-thetaq[isys]);
1262 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1263 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1264 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1265 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1266 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1267 pxs += jtKick * TMath::Cos(phiKick);
1268 pys += jtKick * TMath::Sin(phiKick);
1269 TVector3 w(pxs, pys, pzs);
1270 w.RotateY(thetaq[isys]);
1271 w.RotateZ(phiq[isys]);
1272 fPyjets->P[0][ig] = w.X();
1273 fPyjets->P[1][ig] = w.Y();
1274 fPyjets->P[2][ig] = w.Z();
1275 fPyjets->P[2][ig] = w.Mag();
1276 }
1277*/
1278 } // kGluon
1279
6e90ad26 1280
4e383037 1281 // Check energy conservation
0f482ae4 1282 Double_t pxs = 0.;
1283 Double_t pys = 0.;
1284 Double_t pzs = 0.;
1285 Double_t es = 14000.;
1286
1287 for (Int_t i = 0; i < numpart; i++)
1288 {
1289 kst = fPyjets->K[0][i];
1290 if (kst != 1 && kst != 2) continue;
1291 pxs += fPyjets->P[0][i];
1292 pys += fPyjets->P[1][i];
1293 pzs += fPyjets->P[2][i];
1294 es -= fPyjets->P[3][i];
1295 }
1296 if (TMath::Abs(pxs) > 1.e-2 ||
1297 TMath::Abs(pys) > 1.e-2 ||
1298 TMath::Abs(pzs) > 1.e-1) {
1299 printf("%e %e %e %e\n", pxs, pys, pzs, es);
4e383037 1300// Fatal("Quench()", "4-Momentum non-conservation");
452af8c7 1301 }
4e383037 1302
1303 } // end quenching loop (systems)
6e90ad26 1304// Clean-up
0f482ae4 1305 for (Int_t i = 0; i < numpart; i++)
1306 {
4e383037 1307 imo = fPyjets->K[2][i];
1308 if (imo > 1000) {
1309 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1310 }
0f482ae4 1311 }
4e383037 1312// this->Pylist(1);
0f482ae4 1313} // end quench
90d7b703 1314
992f2843 1315
1316void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1317{
1318 // Igor Lokthine's quenching routine
12cb0bc0 1319 // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
1320
992f2843 1321 pyquen(a, ibf, b);
1322}
b280c4cc 1323
12cb0bc0 1324void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl)
1325{
1326 // Set the parameters for the PYQUEN package.
1327 // See comments in PyquenCommon.h
1328
1329
1330 PYQPAR.t0 = t0;
1331 PYQPAR.tau0 = tau0;
1332 PYQPAR.nf = nf;
1333 PYQPAR.iengl = iengl;
1334 PYQPAR.iangl = iangl;
1335}
1336
1337
16a82508 1338void AliPythia::Pyevnw()
1339{
1340 // New multiple interaction scenario
1341 pyevnw();
1342}
1343
cd07c39b 1344void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax)
1345{
1346 // Call medium-modified Pythia jet reconstruction algorithm
1347 //
1348 pyshowq(ip1, ip2, qmax);
1349}
6c43eccb 1350 void AliPythia::Qpygin0()
1351 {
1352 // New multiple interaction scenario
1353 qpygin0();
1354 }
cd07c39b 1355
b280c4cc 1356void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1357{
1358 // Return event specific quenching parameters
1359 xp = fXJet;
1360 yp = fYJet;
1361 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1362
1363}
1364
3dc3ec94 1365void AliPythia::ConfigHeavyFlavor()
1366{
1367 //
1368 // Default configuration for Heavy Flavor production
1369 //
1370 // All QCD processes
1371 //
1372 SetMSEL(1);
1373
1374 // No multiple interactions
1375 SetMSTP(81,0);
39c2e610 1376 SetPARP(81, 0.);
1377 SetPARP(82, 0.);
3dc3ec94 1378 // Initial/final parton shower on (Pythia default)
1379 SetMSTP(61,1);
1380 SetMSTP(71,1);
1381
1382 // 2nd order alpha_s
1383 SetMSTP(2,2);
1384
1385 // QCD scales
1386 SetMSTP(32,2);
1387 SetPARP(34,1.0);
1388}
e0e89f40 1389
1390void AliPythia::AtlasTuning()
1391{
1392 //
1393 // Configuration for the ATLAS tuning
0bd3d7c5 1394 if (fItune > -1) return;
1395 printf("ATLAS TUNE \n");
1396
1397 SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf
1398 SetMSTP(81,1); // Multiple Interactions ON
1399 SetMSTP(82,4); // Double Gaussian Model
1400 SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
1401 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1402 SetPARP(89,1000.); // [GeV] Ref. energy
1403 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1404 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1405 SetPARP(84,0.5); // Core radius
1406 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1407 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1408 SetPARP(67,1); // Regulates Initial State Radiation
1409}
1410
1411void AliPythia::AtlasTuning_MC09()
1412{
1413 //
1414 // Configuration for the ATLAS tuning
1415 if (fItune > -1) return;
1416 printf("ATLAS New TUNE MC09\n");
1417 SetMSTP(81,21); // treatment for MI, ISR, FSR and beam remnants: MI on, new model
1418 SetMSTP(82, 4); // Double Gaussian Model
1419 SetMSTP(52, 2); // External PDF
1420 SetMSTP(51, 20650); // MRST LO*
1421
1422
1423 SetMSTP(70, 0); // (was 2: def manual 1, def code 0) virtuality scale for ISR
1424 SetMSTP(72, 1); // (was 0: def 1) maximum scale for FSR
1425 SetMSTP(88, 1); // (was 0: def 1) strategy for qq junction to di-quark or baryon in beam remnant
1426 SetMSTP(90, 0); // (was 1: def 0) strategy of compensate the primordial kT
1427
1428 SetPARP(78, 0.3); // the amount of color reconnection in the final state
1429 SetPARP(80, 0.1); // probability of color partons kicked out from beam remnant
1430 SetPARP(82, 2.3); // [GeV] PT_min at Ref. energy
1431 SetPARP(83, 0.8); // Core density in proton matter distribution (def.value)
1432 SetPARP(84, 0.7); // Core radius
1433 SetPARP(90, 0.25); // 2*epsilon (exponent in power law)
1434 SetPARJ(81, 0.29); // (was 0.14: def 0.29) Labmda value in running alpha_s for parton showers
1435
1436 SetMSTP(95, 6);
1437 SetPARJ(41, 0.3); // a and b parameters of the symmm. Lund FF
1438 SetPARJ(42, 0.58);
1439 SetPARJ(46, 0.75); // mod. of the Lund FF for heavy end-point quarks
1440 SetPARP(89,1800.); // [GeV] Ref. energy
e0e89f40 1441}
e8a8adcd 1442
1443AliPythia& AliPythia::operator=(const AliPythia& rhs)
1444{
1445// Assignment operator
1446 rhs.Copy(*this);
1447 return *this;
1448}
1449
1450 void AliPythia::Copy(TObject&) const
1451{
1452 //
1453 // Copy
1454 //
1455 Fatal("Copy","Not implemented!\n");
1456}
cd07c39b 1457
03358a32 1458void AliPythia::DalitzDecays()
1459{
1460
1461 //
1462 // Replace all omega dalitz decays with the correct matrix element decays
1463 //
1464 Int_t nt = fPyjets->N;
1465 for (Int_t i = 0; i < nt; i++) {
1466 if (fPyjets->K[1][i] != 223) continue;
1467 Int_t fd = fPyjets->K[3][i] - 1;
1468 Int_t ld = fPyjets->K[4][i] - 1;
1469 if (fd < 0) continue;
1470 if ((ld - fd) != 2) continue;
1471 if ((fPyjets->K[1][fd] != 111) ||
1472 (TMath::Abs(fPyjets->K[1][fd+1]) != 11)) continue;
1473 TLorentzVector omega(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1474 fOmegaDalitz.Decay(223, &omega);
1475 for (Int_t j = 0; j < 3; j++) {
1476 for (Int_t k = 0; k < 4; k++) {
1477 TLorentzVector vec = (fOmegaDalitz.Products())[2-j];
1478 fPyjets->P[k][fd+j] = vec[k];
1479 }
1480 }
1481 }
1482}