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