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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 | ||
17 | /* $Id: AliPythia.cxx,v 1.40 2007/10/09 08:43:24 morsch Exp $ */ | |
18 | ||
19 | #include "AliPythia6.h" | |
20 | #include "AliStack.h" | |
21 | #include "AliPythiaRndm.h" | |
22 | #include "AliFastGlauber.h" | |
23 | #include "AliQuenchingWeights.h" | |
24 | ||
25 | #include "TVector3.h" | |
26 | #include "TParticle.h" | |
27 | #include "PyquenCommon.h" | |
28 | ||
29 | ClassImp(AliPythia6) | |
30 | ||
31 | #ifndef WIN32 | |
32 | # define pyclus pyclus_ | |
33 | # define pycell pycell_ | |
34 | # define pyshow pyshow_ | |
35 | # define pyrobo pyrobo_ | |
36 | # define pyquen pyquen_ | |
37 | # define pyevnw pyevnw_ | |
38 | # define type_of_call | |
39 | #else | |
40 | # define pyclus PYCLUS | |
41 | # define pycell PYCELL | |
42 | # define pyrobo PYROBO | |
43 | # define pyquen PYQUEN | |
44 | # define pyevnw PYEVNW | |
45 | # define type_of_call _stdcall | |
46 | #endif | |
47 | ||
48 | extern "C" void type_of_call pyclus(Int_t & ); | |
49 | extern "C" void type_of_call pycell(Int_t & ); | |
50 | extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &); | |
51 | extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &); | |
52 | extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &); | |
53 | extern "C" void type_of_call pyevnw(); | |
54 | ||
55 | ||
56 | //_____________________________________________________________________________ | |
57 | ||
58 | AliPythia6* AliPythia6::fgAliPythia=NULL; | |
59 | ||
60 | AliPythia6::AliPythia6(): | |
61 | TPythia6(), | |
62 | AliPythiaBase(), | |
63 | fProcess(kPyMb), | |
64 | fEcms(0.), | |
65 | fStrucFunc(kCTEQ5L), | |
66 | fXJet(0.), | |
67 | fYJet(0.), | |
68 | fNGmax(30), | |
69 | fZmax(0.97), | |
70 | fGlauber(0), | |
71 | fQuenchingWeights(0) | |
72 | { | |
73 | // Default Constructor | |
74 | // | |
75 | // Set random number | |
76 | if (!AliPythiaRndm::GetPythiaRandom()) | |
77 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
78 | fGlauber = 0; | |
79 | fQuenchingWeights = 0; | |
80 | } | |
81 | ||
82 | AliPythia6::AliPythia6(const AliPythia6& pythia): | |
83 | TPythia6(), | |
84 | AliPythiaBase(), | |
85 | fProcess(kPyMb), | |
86 | fEcms(0.), | |
87 | fStrucFunc(kCTEQ5L), | |
88 | fXJet(0.), | |
89 | fYJet(0.), | |
90 | fNGmax(30), | |
91 | fZmax(0.97), | |
92 | fGlauber(0), | |
93 | fQuenchingWeights(0) | |
94 | { | |
95 | // Copy Constructor | |
96 | pythia.Copy(*this); | |
97 | } | |
98 | ||
99 | void AliPythia6::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) | |
100 | { | |
101 | // Initialise the process to generate | |
102 | if (!AliPythiaRndm::GetPythiaRandom()) | |
103 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
104 | ||
105 | fProcess = process; | |
106 | fEcms = energy; | |
107 | fStrucFunc = strucfunc; | |
108 | //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-. | |
109 | SetMDCY(Pycomp(111) ,1,0); | |
110 | SetMDCY(Pycomp(310) ,1,0); | |
111 | SetMDCY(Pycomp(3122),1,0); | |
112 | SetMDCY(Pycomp(3112),1,0); | |
113 | SetMDCY(Pycomp(3212),1,0); | |
114 | SetMDCY(Pycomp(3222),1,0); | |
115 | SetMDCY(Pycomp(3312),1,0); | |
116 | SetMDCY(Pycomp(3322),1,0); | |
117 | SetMDCY(Pycomp(3334),1,0); | |
118 | // Select structure function | |
119 | SetMSTP(52,2); | |
120 | SetMSTP(51,AliStructFuncType::PDFsetIndex(strucfunc)); | |
121 | // Particles produced in string fragmentation point directly to either of the two endpoints | |
122 | // of the string (depending in the side they were generated from). | |
123 | SetMSTU(16,2); | |
124 | ||
125 | // | |
126 | // Pythia initialisation for selected processes// | |
127 | // | |
128 | // Make MSEL clean | |
129 | // | |
130 | for (Int_t i=1; i<= 200; i++) { | |
131 | SetMSUB(i,0); | |
132 | } | |
133 | // select charm production | |
134 | switch (process) | |
135 | { | |
136 | case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes | |
137 | // Multiple interactions on. | |
138 | SetMSTP(81,1); | |
139 | // Double Gaussian matter distribution. | |
140 | SetMSTP(82,4); | |
141 | SetPARP(83,0.5); | |
142 | SetPARP(84,0.4); | |
143 | // pT0. | |
144 | SetPARP(82,2.0); | |
145 | // Reference energy for pT0 and energy rescaling pace. | |
146 | SetPARP(89,1800); | |
147 | SetPARP(90,0.25); | |
148 | // String drawing almost completely minimizes string length. | |
149 | SetPARP(85,0.9); | |
150 | SetPARP(86,0.95); | |
151 | // ISR and FSR activity. | |
152 | SetPARP(67,4); | |
153 | SetPARP(71,4); | |
154 | // Lambda_FSR scale. | |
155 | SetPARJ(81,0.29); | |
156 | break; | |
157 | case kPyOldUEQ2ordered2: | |
158 | // Old underlying events with Q2 ordered QCD processes | |
159 | // Multiple interactions on. | |
160 | SetMSTP(81,1); | |
161 | // Double Gaussian matter distribution. | |
162 | SetMSTP(82,4); | |
163 | SetPARP(83,0.5); | |
164 | SetPARP(84,0.4); | |
165 | // pT0. | |
166 | SetPARP(82,2.0); | |
167 | // Reference energy for pT0 and energy rescaling pace. | |
168 | SetPARP(89,1800); | |
169 | SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered | |
170 | // String drawing almost completely minimizes string length. | |
171 | SetPARP(85,0.9); | |
172 | SetPARP(86,0.95); | |
173 | // ISR and FSR activity. | |
174 | SetPARP(67,4); | |
175 | SetPARP(71,4); | |
176 | // Lambda_FSR scale. | |
177 | SetPARJ(81,0.29); | |
178 | break; | |
179 | case kPyOldPopcorn: | |
180 | // Old production mechanism: Old Popcorn | |
181 | SetMSEL(1); | |
182 | SetMSTJ(12,3); | |
183 | // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon | |
184 | SetMSTP(88,2); | |
185 | // (D=1)see can be used to form baryons (BARYON JUNCTION) | |
186 | SetMSTJ(1,1); | |
187 | AtlasTuning(); | |
188 | break; | |
189 | case kPyCharm: | |
190 | SetMSEL(4); | |
191 | // heavy quark masses | |
192 | ||
193 | SetPMAS(4,1,1.2); | |
194 | // | |
195 | // primordial pT | |
196 | SetMSTP(91,1); | |
197 | SetPARP(91,1.); | |
198 | SetPARP(93,5.); | |
199 | // | |
200 | break; | |
201 | case kPyBeauty: | |
202 | SetMSEL(5); | |
203 | SetPMAS(5,1,4.75); | |
204 | break; | |
205 | case kPyJpsi: | |
206 | SetMSEL(0); | |
207 | // gg->J/Psi g | |
208 | SetMSUB(86,1); | |
209 | break; | |
210 | case kPyJpsiChi: | |
211 | SetMSEL(0); | |
212 | // gg->J/Psi g | |
213 | SetMSUB(86,1); | |
214 | // gg-> chi_0c g | |
215 | SetMSUB(87,1); | |
216 | // gg-> chi_1c g | |
217 | SetMSUB(88,1); | |
218 | // gg-> chi_2c g | |
219 | SetMSUB(89,1); | |
220 | break; | |
221 | case kPyCharmUnforced: | |
222 | SetMSEL(0); | |
223 | // gq->qg | |
224 | SetMSUB(28,1); | |
225 | // gg->qq | |
226 | SetMSUB(53,1); | |
227 | // gg->gg | |
228 | SetMSUB(68,1); | |
229 | break; | |
230 | case kPyBeautyUnforced: | |
231 | SetMSEL(0); | |
232 | // gq->qg | |
233 | SetMSUB(28,1); | |
234 | // gg->qq | |
235 | SetMSUB(53,1); | |
236 | // gg->gg | |
237 | SetMSUB(68,1); | |
238 | break; | |
239 | case kPyMb: | |
240 | // Minimum Bias pp-Collisions | |
241 | // | |
242 | // | |
243 | // select Pythia min. bias model | |
244 | SetMSEL(0); | |
245 | SetMSUB(92,1); // single diffraction AB-->XB | |
246 | SetMSUB(93,1); // single diffraction AB-->AX | |
247 | SetMSUB(94,1); // double diffraction | |
248 | SetMSUB(95,1); // low pt production | |
249 | ||
250 | AtlasTuning(); | |
251 | break; | |
252 | case kPyMbDefault: | |
253 | // Minimum Bias pp-Collisions | |
254 | // | |
255 | // | |
256 | // select Pythia min. bias model | |
257 | SetMSEL(0); | |
258 | SetMSUB(92,1); // single diffraction AB-->XB | |
259 | SetMSUB(93,1); // single diffraction AB-->AX | |
260 | SetMSUB(94,1); // double diffraction | |
261 | SetMSUB(95,1); // low pt production | |
262 | ||
263 | break; | |
264 | case kPyLhwgMb: | |
265 | // Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120 | |
266 | // -> Pythia 6.3 or above is needed | |
267 | // | |
268 | SetMSEL(0); | |
269 | SetMSUB(92,1); // single diffraction AB-->XB | |
270 | SetMSUB(93,1); // single diffraction AB-->AX | |
271 | SetMSUB(94,1); // double diffraction | |
272 | SetMSUB(95,1); // low pt production | |
273 | SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); | |
274 | SetMSTP(52,2); | |
275 | SetMSTP(68,1); | |
276 | SetMSTP(70,2); | |
277 | SetMSTP(81,1); // Multiple Interactions ON | |
278 | SetMSTP(82,4); // Double Gaussian Model | |
279 | SetMSTP(88,1); | |
280 | ||
281 | SetPARP(82,2.3); // [GeV] PT_min at Ref. energy | |
282 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
283 | SetPARP(84,0.5); // Core radius | |
284 | SetPARP(85,0.9); // Regulates gluon prod. mechanism | |
285 | SetPARP(90,0.2); // 2*epsilon (exponent in power law) | |
286 | ||
287 | break; | |
288 | case kPyMbNonDiffr: | |
289 | // Minimum Bias pp-Collisions | |
290 | // | |
291 | // | |
292 | // select Pythia min. bias model | |
293 | SetMSEL(0); | |
294 | SetMSUB(95,1); // low pt production | |
295 | ||
296 | AtlasTuning(); | |
297 | break; | |
298 | case kPyMbMSEL1: | |
299 | ConfigHeavyFlavor(); | |
300 | // Intrinsic <kT^2> | |
301 | SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons | |
302 | SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2 | |
303 | SetPARP(93,5.); // Upper cut-off | |
304 | // Set Q-quark mass | |
305 | SetPMAS(4,1,1.2); // Charm quark mass | |
306 | SetPMAS(5,1,4.78); // Beauty quark mass | |
307 | SetPARP(71,4.); // Defaut value | |
308 | // Atlas Tuning | |
309 | AtlasTuning(); | |
310 | break; | |
311 | case kPyJets: | |
312 | // | |
313 | // QCD Jets | |
314 | // | |
315 | SetMSEL(1); | |
316 | // Pythia Tune A (CDF) | |
317 | // | |
318 | SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis) | |
319 | SetMSTP(82,4); // Double Gaussian Model | |
320 | SetPARP(82,2.0); // [GeV] PT_min at Ref. energy | |
321 | SetPARP(84,0.4); // Core radius | |
322 | SetPARP(85,0.90) ; // Regulates gluon prod. mechanism | |
323 | SetPARP(86,0.95); // Regulates gluon prod. mechanism | |
324 | SetPARP(89,1800.); // [GeV] Ref. energy | |
325 | SetPARP(90,0.25); // 2*epsilon (exponent in power law) | |
326 | break; | |
327 | case kPyDirectGamma: | |
328 | SetMSEL(10); | |
329 | break; | |
330 | case kPyCharmPbPbMNR: | |
331 | case kPyD0PbPbMNR: | |
332 | case kPyDPlusPbPbMNR: | |
333 | case kPyDPlusStrangePbPbMNR: | |
334 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
335 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
336 | // c-cbar single inclusive and double differential distributions. | |
337 | // This parameter settings are meant to work with Pb-Pb collisions | |
338 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
339 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
340 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
341 | ConfigHeavyFlavor(); | |
342 | // Intrinsic <kT> | |
343 | SetMSTP(91,1); | |
344 | SetPARP(91,1.304); | |
345 | SetPARP(93,6.52); | |
346 | // Set c-quark mass | |
347 | SetPMAS(4,1,1.2); | |
348 | break; | |
349 | case kPyCharmpPbMNR: | |
350 | case kPyD0pPbMNR: | |
351 | case kPyDPluspPbMNR: | |
352 | case kPyDPlusStrangepPbMNR: | |
353 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
354 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
355 | // c-cbar single inclusive and double differential distributions. | |
356 | // This parameter settings are meant to work with p-Pb collisions | |
357 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
358 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
359 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
360 | ConfigHeavyFlavor(); | |
361 | // Intrinsic <kT> | |
362 | SetMSTP(91,1); | |
363 | SetPARP(91,1.16); | |
364 | SetPARP(93,5.8); | |
365 | ||
366 | // Set c-quark mass | |
367 | SetPMAS(4,1,1.2); | |
368 | break; | |
369 | case kPyCharmppMNR: | |
370 | case kPyD0ppMNR: | |
371 | case kPyDPlusppMNR: | |
372 | case kPyDPlusStrangeppMNR: | |
373 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
374 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
375 | // c-cbar single inclusive and double differential distributions. | |
376 | // This parameter settings are meant to work with pp collisions | |
377 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
378 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
379 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
380 | ConfigHeavyFlavor(); | |
381 | // Intrinsic <kT^2> | |
382 | SetMSTP(91,1); | |
383 | SetPARP(91,1.); | |
384 | SetPARP(93,5.); | |
385 | ||
386 | // Set c-quark mass | |
387 | SetPMAS(4,1,1.2); | |
388 | break; | |
389 | case kPyCharmppMNRwmi: | |
390 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
391 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
392 | // c-cbar single inclusive and double differential distributions. | |
393 | // This parameter settings are meant to work with pp collisions | |
394 | // and with kCTEQ5L PDFs. | |
395 | // Added multiple interactions according to ATLAS tune settings. | |
396 | // To get a "reasonable" agreement with MNR results, events have to be | |
397 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
398 | // set to 2.76 GeV. | |
399 | // To get a "perfect" agreement with MNR results, events have to be | |
400 | // generated in four ptHard bins with the following relative | |
401 | // normalizations: | |
402 | // 2.76-3 GeV: 25% | |
403 | // 3-4 GeV: 40% | |
404 | // 4-8 GeV: 29% | |
405 | // >8 GeV: 6% | |
406 | ConfigHeavyFlavor(); | |
407 | // Intrinsic <kT^2> | |
408 | SetMSTP(91,1); | |
409 | SetPARP(91,1.); | |
410 | SetPARP(93,5.); | |
411 | ||
412 | // Set c-quark mass | |
413 | SetPMAS(4,1,1.2); | |
414 | AtlasTuning(); | |
415 | break; | |
416 | case kPyBeautyPbPbMNR: | |
417 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
418 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
419 | // b-bbar single inclusive and double differential distributions. | |
420 | // This parameter settings are meant to work with Pb-Pb collisions | |
421 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
422 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
423 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
424 | ConfigHeavyFlavor(); | |
425 | // QCD scales | |
426 | SetPARP(67,1.0); | |
427 | SetPARP(71,1.0); | |
428 | // Intrinsic <kT> | |
429 | SetMSTP(91,1); | |
430 | SetPARP(91,2.035); | |
431 | SetPARP(93,10.17); | |
432 | // Set b-quark mass | |
433 | SetPMAS(5,1,4.75); | |
434 | break; | |
435 | case kPyBeautypPbMNR: | |
436 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
437 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
438 | // b-bbar single inclusive and double differential distributions. | |
439 | // This parameter settings are meant to work with p-Pb collisions | |
440 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
441 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
442 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
443 | ConfigHeavyFlavor(); | |
444 | // QCD scales | |
445 | SetPARP(67,1.0); | |
446 | SetPARP(71,1.0); | |
447 | // Intrinsic <kT> | |
448 | SetMSTP(91,1); | |
449 | SetPARP(91,1.60); | |
450 | SetPARP(93,8.00); | |
451 | // Set b-quark mass | |
452 | SetPMAS(5,1,4.75); | |
453 | break; | |
454 | case kPyBeautyppMNR: | |
455 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
456 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
457 | // b-bbar single inclusive and double differential distributions. | |
458 | // This parameter settings are meant to work with pp collisions | |
459 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
460 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
461 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
462 | ConfigHeavyFlavor(); | |
463 | // QCD scales | |
464 | SetPARP(67,1.0); | |
465 | SetPARP(71,1.0); | |
466 | ||
467 | // Intrinsic <kT> | |
468 | SetMSTP(91,1); | |
469 | SetPARP(91,1.); | |
470 | SetPARP(93,5.); | |
471 | ||
472 | // Set b-quark mass | |
473 | SetPMAS(5,1,4.75); | |
474 | break; | |
475 | case kPyBeautyppMNRwmi: | |
476 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
477 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
478 | // b-bbar single inclusive and double differential distributions. | |
479 | // This parameter settings are meant to work with pp collisions | |
480 | // and with kCTEQ5L PDFs. | |
481 | // Added multiple interactions according to ATLAS tune settings. | |
482 | // To get a "reasonable" agreement with MNR results, events have to be | |
483 | // generated with the minimum ptHard (AliGenPythia::SetPtHard) | |
484 | // set to 2.76 GeV. | |
485 | // To get a "perfect" agreement with MNR results, events have to be | |
486 | // generated in four ptHard bins with the following relative | |
487 | // normalizations: | |
488 | // 2.76-4 GeV: 5% | |
489 | // 4-6 GeV: 31% | |
490 | // 6-8 GeV: 28% | |
491 | // >8 GeV: 36% | |
492 | ConfigHeavyFlavor(); | |
493 | // QCD scales | |
494 | SetPARP(67,1.0); | |
495 | SetPARP(71,1.0); | |
496 | ||
497 | // Intrinsic <kT> | |
498 | SetMSTP(91,1); | |
499 | SetPARP(91,1.); | |
500 | SetPARP(93,5.); | |
501 | ||
502 | // Set b-quark mass | |
503 | SetPMAS(5,1,4.75); | |
504 | ||
505 | AtlasTuning(); | |
506 | break; | |
507 | case kPyW: | |
508 | ||
509 | //Inclusive production of W+/- | |
510 | SetMSEL(0); | |
511 | //f fbar -> W+ | |
512 | SetMSUB(2,1); | |
513 | // //f fbar -> g W+ | |
514 | // SetMSUB(16,1); | |
515 | // //f fbar -> gamma W+ | |
516 | // SetMSUB(20,1); | |
517 | // //f g -> f W+ | |
518 | // SetMSUB(31,1); | |
519 | // //f gamma -> f W+ | |
520 | // SetMSUB(36,1); | |
521 | ||
522 | // Initial/final parton shower on (Pythia default) | |
523 | // With parton showers on we are generating "W inclusive process" | |
524 | SetMSTP(61,1); //Initial QCD & QED showers on | |
525 | SetMSTP(71,1); //Final QCD & QED showers on | |
526 | ||
527 | break; | |
528 | ||
529 | case kPyZ: | |
530 | ||
531 | //Inclusive production of Z | |
532 | SetMSEL(0); | |
533 | //f fbar -> Z/gamma | |
534 | SetMSUB(1,1); | |
535 | ||
536 | // // f fbar -> g Z/gamma | |
537 | // SetMSUB(15,1); | |
538 | // // f fbar -> gamma Z/gamma | |
539 | // SetMSUB(19,1); | |
540 | // // f g -> f Z/gamma | |
541 | // SetMSUB(30,1); | |
542 | // // f gamma -> f Z/gamma | |
543 | // SetMSUB(35,1); | |
544 | ||
545 | //only Z included, not gamma | |
546 | SetMSTP(43,2); | |
547 | ||
548 | // Initial/final parton shower on (Pythia default) | |
549 | // With parton showers on we are generating "Z inclusive process" | |
550 | SetMSTP(61,1); //Initial QCD & QED showers on | |
551 | SetMSTP(71,1); //Final QCD & QED showers on | |
552 | ||
553 | break; | |
554 | ||
555 | } | |
556 | // | |
557 | // Initialize PYTHIA | |
558 | SetMSTP(41,1); // all resonance decays switched on | |
559 | Initialize("CMS","p","p",fEcms); | |
560 | ||
561 | } | |
562 | ||
563 | Int_t AliPythia6::CheckedLuComp(Int_t kf) | |
564 | { | |
565 | // Check Lund particle code (for debugging) | |
566 | Int_t kc=Pycomp(kf); | |
567 | return kc; | |
568 | } | |
569 | ||
570 | void AliPythia6::SetNuclei(Int_t a1, Int_t a2) | |
571 | { | |
572 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
573 | // The MSTP array in the PYPARS common block is used to enable and | |
574 | // select the nuclear structure functions. | |
575 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
576 | // =1: internal PYTHIA acording to MSTP(51) | |
577 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
578 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. | |
579 | // MSTP(192) : Mass number of nucleus side 1 | |
580 | // MSTP(193) : Mass number of nucleus side 2 | |
581 | SetMSTP(52,2); | |
582 | SetMSTP(192, a1); | |
583 | SetMSTP(193, a2); | |
584 | } | |
585 | ||
586 | ||
587 | AliPythia6* AliPythia6::Instance() | |
588 | { | |
589 | // Set random number generator | |
590 | if (fgAliPythia) { | |
591 | return fgAliPythia; | |
592 | } else { | |
593 | fgAliPythia = new AliPythia6(); | |
594 | return fgAliPythia; | |
595 | } | |
596 | } | |
597 | ||
598 | void AliPythia6::PrintParticles() | |
599 | { | |
600 | // Print list of particl properties | |
601 | Int_t np = 0; | |
602 | char* name = new char[16]; | |
603 | for (Int_t kf=0; kf<1000000; kf++) { | |
604 | for (Int_t c = 1; c > -2; c-=2) { | |
605 | Int_t kc = Pycomp(c*kf); | |
606 | if (kc) { | |
607 | Float_t mass = GetPMAS(kc,1); | |
608 | Float_t width = GetPMAS(kc,2); | |
609 | Float_t tau = GetPMAS(kc,4); | |
610 | ||
611 | Pyname(kf,name); | |
612 | ||
613 | np++; | |
614 | ||
615 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
616 | c*kf, name, mass, width, tau); | |
617 | } | |
618 | } | |
619 | } | |
620 | printf("\n Number of particles %d \n \n", np); | |
621 | } | |
622 | ||
623 | void AliPythia6::ResetDecayTable() | |
624 | { | |
625 | // Set default values for pythia decay switches | |
626 | Int_t i; | |
627 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
628 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
629 | } | |
630 | ||
631 | void AliPythia6::SetDecayTable() | |
632 | { | |
633 | // Set default values for pythia decay switches | |
634 | // | |
635 | Int_t i; | |
636 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
637 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
638 | } | |
639 | ||
640 | void AliPythia6::Pyclus(Int_t& njet) | |
641 | { | |
642 | // Call Pythia clustering algorithm | |
643 | // | |
644 | pyclus(njet); | |
645 | } | |
646 | ||
647 | void AliPythia6::Pycell(Int_t& njet) | |
648 | { | |
649 | // Call Pythia jet reconstruction algorithm | |
650 | // | |
651 | pycell(njet); | |
652 | } | |
653 | ||
654 | void AliPythia6::GetJet(Int_t i, Float_t& px, Float_t& py, Float_t& pz, Float_t& e) | |
655 | { | |
656 | // Get jet number i | |
657 | Int_t n = GetN(); | |
658 | px = GetPyjets()->P[0][n+i]; | |
659 | py = GetPyjets()->P[1][n+i]; | |
660 | pz = GetPyjets()->P[2][n+i]; | |
661 | e = GetPyjets()->P[3][n+i]; | |
662 | } | |
663 | ||
664 | void AliPythia6::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax) | |
665 | { | |
666 | // Call Pythia showering | |
667 | // | |
668 | pyshow(ip1, ip2, qmax); | |
669 | } | |
670 | ||
671 | void AliPythia6::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez) | |
672 | { | |
673 | pyrobo(imi, ima, the, phi, bex, bey, bez); | |
674 | } | |
675 | ||
676 | ||
677 | ||
678 | void AliPythia6::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax) | |
679 | { | |
680 | // Initializes | |
681 | // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann | |
682 | // (2) The nuclear geometry using the Glauber Model | |
683 | // | |
684 | ||
685 | fGlauber = new AliFastGlauber(); | |
686 | fGlauber->Init(2); | |
687 | fGlauber->SetCentralityClass(cMin, cMax); | |
688 | ||
689 | fQuenchingWeights = new AliQuenchingWeights(); | |
690 | fQuenchingWeights->InitMult(); | |
691 | fQuenchingWeights->SetK(k); | |
692 | fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod)); | |
693 | fNGmax = ngmax; | |
694 | fZmax = zmax; | |
695 | ||
696 | } | |
697 | ||
698 | ||
699 | void AliPythia6::Quench() | |
700 | { | |
701 | // | |
702 | // | |
703 | // Simple Jet Quenching routine: | |
704 | // ============================= | |
705 | // The jet formed by all final state partons radiated by the parton created | |
706 | // in the hard collisions is quenched by a factor (1-z) using light cone variables in | |
707 | // the initial parton reference frame: | |
708 | // (E + p_z)new = (1-z) (E + p_z)old | |
709 | // | |
710 | // | |
711 | // | |
712 | // | |
713 | // The lost momentum is first balanced by one gluon with virtuality > 0. | |
714 | // Subsequently the gluon splits to yield two gluons with E = p. | |
715 | // | |
716 | // | |
717 | // | |
718 | static Float_t eMean = 0.; | |
719 | static Int_t icall = 0; | |
720 | ||
721 | Double_t p0[4][5]; | |
722 | Double_t p1[4][5]; | |
723 | Double_t p2[4][5]; | |
724 | Int_t klast[4] = {-1, -1, -1, -1}; | |
725 | ||
726 | Int_t numpart = fPyjets->N; | |
727 | Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.; | |
728 | Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4]; | |
729 | Bool_t quenched[4]; | |
730 | Double_t wjtKick[4]; | |
731 | Int_t nGluon[4]; | |
732 | Int_t qPdg[4]; | |
733 | Int_t imo, kst, pdg; | |
734 | ||
735 | // | |
736 | // Sore information about Primary partons | |
737 | // | |
738 | // j = | |
739 | // 0, 1 partons from hard scattering | |
740 | // 2, 3 partons from initial state radiation | |
741 | // | |
742 | for (Int_t i = 2; i <= 7; i++) { | |
743 | Int_t j = 0; | |
744 | // Skip gluons that participate in hard scattering | |
745 | if (i == 4 || i == 5) continue; | |
746 | // Gluons from hard Scattering | |
747 | if (i == 6 || i == 7) { | |
748 | j = i - 6; | |
749 | pxq[j] = fPyjets->P[0][i]; | |
750 | pyq[j] = fPyjets->P[1][i]; | |
751 | pzq[j] = fPyjets->P[2][i]; | |
752 | eq[j] = fPyjets->P[3][i]; | |
753 | mq[j] = fPyjets->P[4][i]; | |
754 | } else { | |
755 | // Gluons from initial state radiation | |
756 | // | |
757 | // Obtain 4-momentum vector from difference between original parton and parton after gluon | |
758 | // radiation. Energy is calculated independently because initial state radition does not | |
759 | // conserve strictly momentum and energy for each partonic system independently. | |
760 | // | |
761 | // Not very clean. Should be improved ! | |
762 | // | |
763 | // | |
764 | j = i; | |
765 | pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2]; | |
766 | pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2]; | |
767 | pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2]; | |
768 | mq[j] = fPyjets->P[4][i]; | |
769 | eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]); | |
770 | } | |
771 | // | |
772 | // Calculate some kinematic variables | |
773 | // | |
774 | yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14)); | |
775 | pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]); | |
776 | phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]); | |
777 | ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]); | |
778 | thetaq[j] = TMath::ATan2(ptq[j], pzq[j]); | |
779 | qPdg[j] = fPyjets->K[1][i]; | |
780 | } | |
781 | ||
782 | Double_t int0[4]; | |
783 | Double_t int1[4]; | |
784 | ||
785 | fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.); | |
786 | ||
787 | for (Int_t j = 0; j < 4; j++) { | |
788 | // | |
789 | // Quench only central jets and with E > 10. | |
790 | // | |
791 | ||
792 | ||
793 | Int_t itype = (qPdg[j] == 21) ? 2 : 1; | |
794 | Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]); | |
795 | ||
796 | if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) { | |
797 | fZQuench[j] = 0.; | |
798 | } else { | |
799 | if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) { | |
800 | icall ++; | |
801 | eMean += eloss; | |
802 | } | |
803 | // | |
804 | // Extra pt | |
805 | Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]); | |
806 | wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j])); | |
807 | // | |
808 | // Fractional energy loss | |
809 | fZQuench[j] = eloss / eq[j]; | |
810 | // | |
811 | // Avoid complete loss | |
812 | // | |
1044c4d8 | 813 | if (fZQuench[j] > fZmax) fZQuench[j] = fZmax; |
39d810c8 | 814 | // |
815 | // Some debug printing | |
816 | ||
817 | ||
818 | // 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", | |
819 | // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]); | |
820 | ||
821 | // fZQuench[j] = 0.8; | |
822 | // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2); | |
823 | } | |
824 | ||
825 | quenched[j] = (fZQuench[j] > 0.01); | |
826 | } // primary partons | |
827 | ||
828 | ||
829 | ||
830 | Double_t pNew[1000][4]; | |
831 | Int_t kNew[1000]; | |
832 | Int_t icount = 0; | |
833 | Double_t zquench[4]; | |
834 | ||
835 | // | |
836 | // System Loop | |
837 | for (Int_t isys = 0; isys < 4; isys++) { | |
838 | // Skip to next system if not quenched. | |
839 | if (!quenched[isys]) continue; | |
840 | ||
841 | nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys])); | |
842 | if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax; | |
843 | zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys])); | |
844 | wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys])); | |
845 | ||
846 | ||
847 | ||
848 | Int_t igMin = -1; | |
849 | Int_t igMax = -1; | |
850 | Double_t pg[4] = {0., 0., 0., 0.}; | |
851 | ||
852 | // | |
853 | // Loop on radiation events | |
854 | ||
855 | for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) { | |
856 | while (1) { | |
857 | icount = 0; | |
858 | for (Int_t k = 0; k < 4; k++) | |
859 | { | |
860 | p0[isys][k] = 0.; | |
861 | p1[isys][k] = 0.; | |
862 | p2[isys][k] = 0.; | |
863 | } | |
864 | // Loop over partons | |
865 | for (Int_t i = 0; i < numpart; i++) | |
866 | { | |
867 | imo = fPyjets->K[2][i]; | |
868 | kst = fPyjets->K[0][i]; | |
869 | pdg = fPyjets->K[1][i]; | |
870 | ||
871 | ||
872 | ||
873 | // Quarks and gluons only | |
874 | if (pdg != 21 && TMath::Abs(pdg) > 6) continue; | |
875 | // Particles from hard scattering only | |
876 | ||
877 | if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1]; | |
878 | Int_t imom = imo % 1000; | |
879 | if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue; | |
880 | if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue; | |
881 | ||
882 | ||
883 | // Skip comment lines | |
884 | if (kst != 1 && kst != 2) continue; | |
885 | // | |
886 | // Parton kinematic | |
887 | px = fPyjets->P[0][i]; | |
888 | py = fPyjets->P[1][i]; | |
889 | pz = fPyjets->P[2][i]; | |
890 | e = fPyjets->P[3][i]; | |
891 | m = fPyjets->P[4][i]; | |
892 | pt = TMath::Sqrt(px * px + py * py); | |
893 | p = TMath::Sqrt(px * px + py * py + pz * pz); | |
894 | phi = TMath::Pi() + TMath::ATan2(-py, -px); | |
895 | theta = TMath::ATan2(pt, pz); | |
896 | ||
897 | // | |
898 | // Save 4-momentum sum for balancing | |
899 | Int_t index = isys; | |
900 | ||
901 | p0[index][0] += px; | |
902 | p0[index][1] += py; | |
903 | p0[index][2] += pz; | |
904 | p0[index][3] += e; | |
905 | ||
906 | klast[index] = i; | |
907 | ||
908 | // | |
909 | // Fractional energy loss | |
910 | Double_t z = zquench[index]; | |
911 | ||
912 | ||
913 | // Don't fully quench radiated gluons | |
914 | // | |
915 | if (imo > 1000) { | |
916 | // This small factor makes sure that the gluons are not too close in phase space to avoid recombination | |
917 | // | |
918 | ||
919 | z = 0.02; | |
920 | } | |
921 | // printf("z: %d %f\n", imo, z); | |
922 | ||
923 | ||
924 | // | |
925 | ||
926 | // | |
927 | // | |
928 | // Transform into frame in which initial parton is along z-axis | |
929 | // | |
930 | TVector3 v(px, py, pz); | |
931 | v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]); | |
932 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z(); | |
933 | ||
934 | Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys); | |
935 | Double_t mt2 = jt * jt + m * m; | |
936 | Double_t zmax = 1.; | |
937 | // | |
938 | // Kinematic limit on z | |
939 | // | |
940 | if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt); | |
941 | // | |
942 | // Change light-cone kinematics rel. to initial parton | |
943 | // | |
944 | Double_t eppzOld = e + pl; | |
945 | Double_t empzOld = e - pl; | |
946 | ||
947 | Double_t eppzNew = (1. - z) * eppzOld; | |
948 | Double_t empzNew = empzOld - mt2 * z / eppzOld; | |
949 | Double_t eNew = 0.5 * (eppzNew + empzNew); | |
950 | Double_t plNew = 0.5 * (eppzNew - empzNew); | |
951 | ||
952 | Double_t jtNew; | |
953 | // | |
954 | // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0 | |
955 | Double_t mt2New = eppzNew * empzNew; | |
956 | if (mt2New < 1.e-8) mt2New = 0.; | |
957 | if (z < zmax) { | |
958 | if (m * m > mt2New) { | |
959 | // | |
960 | // This should not happen | |
961 | // | |
962 | Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew); | |
963 | jtNew = 0; | |
964 | } else { | |
965 | jtNew = TMath::Sqrt(mt2New - m * m); | |
966 | } | |
967 | } else { | |
968 | // If pT is to small (probably a leading massive particle) we scale only the energy | |
969 | // This can cause negative masses of the radiated gluon | |
970 | // Let's hope for the best ... | |
971 | jtNew = jt; | |
972 | eNew = TMath::Sqrt(plNew * plNew + mt2); | |
973 | ||
974 | } | |
975 | // | |
976 | // Calculate new px, py | |
977 | // | |
1044c4d8 | 978 | Double_t pxNew = 0; |
979 | Double_t pyNew = 0; | |
980 | ||
981 | if (jt > 0.) { | |
982 | pxNew = jtNew / jt * pxs; | |
983 | pyNew = jtNew / jt * pys; | |
984 | } | |
39d810c8 | 985 | |
986 | // Double_t dpx = pxs - pxNew; | |
987 | // Double_t dpy = pys - pyNew; | |
988 | // Double_t dpz = pl - plNew; | |
989 | // Double_t de = e - eNew; | |
990 | // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz; | |
991 | // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew); | |
992 | // printf("New mass (2) %e %e \n", pxNew, pyNew); | |
993 | // | |
994 | // Rotate back | |
995 | // | |
996 | TVector3 w(pxNew, pyNew, plNew); | |
997 | w.RotateY(thetaq[index]); w.RotateZ(phiq[index]); | |
998 | pxNew = w.X(); pyNew = w.Y(); plNew = w.Z(); | |
999 | ||
1000 | p1[index][0] += pxNew; | |
1001 | p1[index][1] += pyNew; | |
1002 | p1[index][2] += plNew; | |
1003 | p1[index][3] += eNew; | |
1004 | // | |
1005 | // Updated 4-momentum vectors | |
1006 | // | |
1007 | pNew[icount][0] = pxNew; | |
1008 | pNew[icount][1] = pyNew; | |
1009 | pNew[icount][2] = plNew; | |
1010 | pNew[icount][3] = eNew; | |
1011 | kNew[icount] = i; | |
1012 | icount++; | |
1013 | } // parton loop | |
1014 | // | |
1015 | // Check if there was phase-space for quenching | |
1016 | // | |
1017 | ||
1018 | if (icount == 0) quenched[isys] = kFALSE; | |
1019 | if (!quenched[isys]) break; | |
1020 | ||
1021 | for (Int_t j = 0; j < 4; j++) | |
1022 | { | |
1023 | p2[isys][j] = p0[isys][j] - p1[isys][j]; | |
1024 | } | |
1025 | 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]; | |
1026 | if (p2[isys][4] > 0.) { | |
1027 | p2[isys][4] = TMath::Sqrt(p2[isys][4]); | |
1028 | break; | |
1029 | } else { | |
1030 | printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]); | |
1031 | 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]); | |
1032 | if (p2[isys][4] < -0.01) { | |
1033 | printf("Negative mass squared !\n"); | |
1034 | // Here we have to put the gluon back to mass shell | |
1035 | // This will lead to a small energy imbalance | |
1036 | p2[isys][4] = 0.; | |
1037 | p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]); | |
1038 | break; | |
1039 | } else { | |
1040 | p2[isys][4] = 0.; | |
1041 | break; | |
1042 | } | |
1043 | } | |
1044 | /* | |
1045 | zHeavy *= 0.98; | |
1046 | printf("zHeavy lowered to %f\n", zHeavy); | |
1047 | if (zHeavy < 0.01) { | |
1048 | printf("No success ! \n"); | |
1049 | icount = 0; | |
1050 | quenched[isys] = kFALSE; | |
1051 | break; | |
1052 | } | |
1053 | */ | |
1054 | } // iteration on z (while) | |
1055 | ||
1056 | // Update event record | |
1057 | for (Int_t k = 0; k < icount; k++) { | |
1058 | // 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] ); | |
1059 | fPyjets->P[0][kNew[k]] = pNew[k][0]; | |
1060 | fPyjets->P[1][kNew[k]] = pNew[k][1]; | |
1061 | fPyjets->P[2][kNew[k]] = pNew[k][2]; | |
1062 | fPyjets->P[3][kNew[k]] = pNew[k][3]; | |
1063 | } | |
1064 | // | |
1065 | // Add the gluons | |
1066 | // | |
1067 | Int_t ish = 0; | |
1068 | Int_t iGlu; | |
1069 | if (!quenched[isys]) continue; | |
1070 | // | |
1071 | // Last parton from shower i | |
1072 | Int_t in = klast[isys]; | |
1073 | // | |
1074 | // Continue if no parton in shower i selected | |
1075 | if (in == -1) continue; | |
1076 | // | |
1077 | // If this is the second initial parton and it is behind the first move pointer by previous ish | |
1078 | if (isys == 1 && klast[1] > klast[0]) in += ish; | |
1079 | // | |
1080 | // Starting index | |
1081 | ||
1082 | // jmin = in - 1; | |
1083 | // How many additional gluons will be generated | |
1084 | ish = 1; | |
1085 | if (p2[isys][4] > 0.05) ish = 2; | |
1086 | // | |
1087 | // Position of gluons | |
1088 | iGlu = numpart; | |
1089 | if (iglu == 0) igMin = iGlu; | |
1090 | igMax = iGlu; | |
1091 | numpart += ish; | |
1092 | (fPyjets->N) += ish; | |
1093 | ||
1094 | if (ish == 1) { | |
1095 | fPyjets->P[0][iGlu] = p2[isys][0]; | |
1096 | fPyjets->P[1][iGlu] = p2[isys][1]; | |
1097 | fPyjets->P[2][iGlu] = p2[isys][2]; | |
1098 | fPyjets->P[3][iGlu] = p2[isys][3]; | |
1099 | fPyjets->P[4][iGlu] = p2[isys][4]; | |
1100 | ||
1101 | fPyjets->K[0][iGlu] = 1; | |
1102 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1; | |
1103 | fPyjets->K[1][iGlu] = 21; | |
1104 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; | |
1105 | fPyjets->K[3][iGlu] = -1; | |
1106 | fPyjets->K[4][iGlu] = -1; | |
1107 | ||
1108 | pg[0] += p2[isys][0]; | |
1109 | pg[1] += p2[isys][1]; | |
1110 | pg[2] += p2[isys][2]; | |
1111 | pg[3] += p2[isys][3]; | |
1112 | } else { | |
1113 | // | |
1114 | // Split gluon in rest frame. | |
1115 | // | |
1116 | Double_t bx = p2[isys][0] / p2[isys][3]; | |
1117 | Double_t by = p2[isys][1] / p2[isys][3]; | |
1118 | Double_t bz = p2[isys][2] / p2[isys][3]; | |
1119 | Double_t pst = p2[isys][4] / 2.; | |
1120 | // | |
1121 | // Isotropic decay ???? | |
1122 | Double_t cost = 2. * gRandom->Rndm() - 1.; | |
1123 | Double_t sint = TMath::Sqrt(1. - cost * cost); | |
2ab330c9 | 1124 | Double_t phis = 2. * TMath::Pi() * gRandom->Rndm(); |
39d810c8 | 1125 | |
1126 | Double_t pz1 = pst * cost; | |
1127 | Double_t pz2 = -pst * cost; | |
1128 | Double_t pt1 = pst * sint; | |
1129 | Double_t pt2 = -pst * sint; | |
2ab330c9 | 1130 | Double_t px1 = pt1 * TMath::Cos(phis); |
1131 | Double_t py1 = pt1 * TMath::Sin(phis); | |
1132 | Double_t px2 = pt2 * TMath::Cos(phis); | |
1133 | Double_t py2 = pt2 * TMath::Sin(phis); | |
39d810c8 | 1134 | |
1135 | fPyjets->P[0][iGlu] = px1; | |
1136 | fPyjets->P[1][iGlu] = py1; | |
1137 | fPyjets->P[2][iGlu] = pz1; | |
1138 | fPyjets->P[3][iGlu] = pst; | |
1139 | fPyjets->P[4][iGlu] = 0.; | |
1140 | ||
1141 | fPyjets->K[0][iGlu] = 1 ; | |
1142 | fPyjets->K[1][iGlu] = 21; | |
1143 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; | |
1144 | fPyjets->K[3][iGlu] = -1; | |
1145 | fPyjets->K[4][iGlu] = -1; | |
1146 | ||
1147 | fPyjets->P[0][iGlu+1] = px2; | |
1148 | fPyjets->P[1][iGlu+1] = py2; | |
1149 | fPyjets->P[2][iGlu+1] = pz2; | |
1150 | fPyjets->P[3][iGlu+1] = pst; | |
1151 | fPyjets->P[4][iGlu+1] = 0.; | |
1152 | ||
1153 | fPyjets->K[0][iGlu+1] = 1; | |
1154 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1; | |
1155 | fPyjets->K[1][iGlu+1] = 21; | |
1156 | fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000; | |
1157 | fPyjets->K[3][iGlu+1] = -1; | |
1158 | fPyjets->K[4][iGlu+1] = -1; | |
1159 | SetMSTU(1,0); | |
1160 | SetMSTU(2,0); | |
1161 | // | |
1162 | // Boost back | |
1163 | // | |
1164 | Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz); | |
1165 | } | |
1166 | /* | |
1167 | for (Int_t ig = iGlu; ig < iGlu+ish; ig++) { | |
1168 | Double_t px, py, pz; | |
1169 | px = fPyjets->P[0][ig]; | |
1170 | py = fPyjets->P[1][ig]; | |
1171 | pz = fPyjets->P[2][ig]; | |
1172 | TVector3 v(px, py, pz); | |
1173 | v.RotateZ(-phiq[isys]); | |
1174 | v.RotateY(-thetaq[isys]); | |
1175 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z(); | |
1176 | Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1177 | Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r)); | |
1178 | if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.); | |
1179 | Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1180 | pxs += jtKick * TMath::Cos(phiKick); | |
1181 | pys += jtKick * TMath::Sin(phiKick); | |
1182 | TVector3 w(pxs, pys, pzs); | |
1183 | w.RotateY(thetaq[isys]); | |
1184 | w.RotateZ(phiq[isys]); | |
1185 | fPyjets->P[0][ig] = w.X(); | |
1186 | fPyjets->P[1][ig] = w.Y(); | |
1187 | fPyjets->P[2][ig] = w.Z(); | |
1188 | fPyjets->P[2][ig] = w.Mag(); | |
1189 | } | |
1190 | */ | |
1191 | } // kGluon | |
1192 | ||
1193 | ||
1194 | // Check energy conservation | |
1195 | Double_t pxs = 0.; | |
1196 | Double_t pys = 0.; | |
1197 | Double_t pzs = 0.; | |
1198 | Double_t es = 14000.; | |
1199 | ||
1200 | for (Int_t i = 0; i < numpart; i++) | |
1201 | { | |
1202 | kst = fPyjets->K[0][i]; | |
1203 | if (kst != 1 && kst != 2) continue; | |
1204 | pxs += fPyjets->P[0][i]; | |
1205 | pys += fPyjets->P[1][i]; | |
1206 | pzs += fPyjets->P[2][i]; | |
1207 | es -= fPyjets->P[3][i]; | |
1208 | } | |
1209 | if (TMath::Abs(pxs) > 1.e-2 || | |
1210 | TMath::Abs(pys) > 1.e-2 || | |
1211 | TMath::Abs(pzs) > 1.e-1) { | |
1212 | printf("%e %e %e %e\n", pxs, pys, pzs, es); | |
1213 | // Fatal("Quench()", "4-Momentum non-conservation"); | |
1214 | } | |
1215 | ||
1216 | } // end quenching loop (systems) | |
1217 | // Clean-up | |
1218 | for (Int_t i = 0; i < numpart; i++) | |
1219 | { | |
1220 | imo = fPyjets->K[2][i]; | |
1221 | if (imo > 1000) { | |
1222 | fPyjets->K[2][i] = fPyjets->K[2][i] % 1000; | |
1223 | } | |
1224 | } | |
1225 | // this->Pylist(1); | |
1226 | } // end quench | |
1227 | ||
1228 | ||
1229 | void AliPythia6::Pyquen(Double_t a, Int_t ibf, Double_t b) | |
1230 | { | |
1231 | // Igor Lokthine's quenching routine | |
1232 | // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt | |
1233 | ||
1234 | pyquen(a, ibf, b); | |
1235 | } | |
1236 | ||
1237 | void AliPythia6::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl) | |
1238 | { | |
1239 | // Set the parameters for the PYQUEN package. | |
1240 | // See comments in PyquenCommon.h | |
1241 | ||
1242 | ||
1243 | PYQPAR.t0 = t0; | |
1244 | PYQPAR.tau0 = tau0; | |
1245 | PYQPAR.nf = nf; | |
1246 | PYQPAR.iengl = iengl; | |
1247 | PYQPAR.iangl = iangl; | |
1248 | } | |
1249 | ||
1250 | void AliPythia6::LoadEvent(AliStack* stack, Int_t flag, Int_t reHadr) | |
1251 | { | |
1252 | // | |
1253 | // Load event into Pythia Common Block | |
1254 | // | |
1255 | ||
1256 | Int_t npart = stack -> GetNprimary(); | |
1257 | Int_t n0 = 0; | |
1258 | ||
1259 | if (!flag) { | |
1260 | GetPyjets()->N = npart; | |
1261 | } else { | |
1262 | n0 = GetPyjets()->N; | |
1263 | GetPyjets()->N = n0 + npart; | |
1264 | } | |
1265 | ||
1266 | ||
1267 | for (Int_t part = 0; part < npart; part++) { | |
1268 | TParticle *mPart = stack->Particle(part); | |
1269 | ||
1270 | Int_t kf = mPart->GetPdgCode(); | |
1271 | Int_t ks = mPart->GetStatusCode(); | |
1272 | Int_t idf = mPart->GetFirstDaughter(); | |
1273 | Int_t idl = mPart->GetLastDaughter(); | |
1274 | ||
1275 | if (reHadr) { | |
1276 | if (ks == 11 || ks == 12) { | |
1277 | ks -= 10; | |
1278 | idf = -1; | |
1279 | idl = -1; | |
1280 | } | |
1281 | } | |
1282 | ||
1283 | Float_t px = mPart->Px(); | |
1284 | Float_t py = mPart->Py(); | |
1285 | Float_t pz = mPart->Pz(); | |
1286 | Float_t e = mPart->Energy(); | |
1287 | Float_t m = mPart->GetCalcMass(); | |
1288 | ||
1289 | ||
1290 | (GetPyjets())->P[0][part+n0] = px; | |
1291 | (GetPyjets())->P[1][part+n0] = py; | |
1292 | (GetPyjets())->P[2][part+n0] = pz; | |
1293 | (GetPyjets())->P[3][part+n0] = e; | |
1294 | (GetPyjets())->P[4][part+n0] = m; | |
1295 | ||
1296 | (GetPyjets())->K[1][part+n0] = kf; | |
1297 | (GetPyjets())->K[0][part+n0] = ks; | |
1298 | (GetPyjets())->K[3][part+n0] = idf + 1; | |
1299 | (GetPyjets())->K[4][part+n0] = idl + 1; | |
1300 | (GetPyjets())->K[2][part+n0] = mPart->GetFirstMother() + 1; | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | ||
1305 | void AliPythia6::Pyevnw() | |
1306 | { | |
1307 | // New multiple interaction scenario | |
1308 | pyevnw(); | |
1309 | } | |
1310 | ||
1311 | void AliPythia6::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4]) | |
1312 | { | |
1313 | // Return event specific quenching parameters | |
1314 | xp = fXJet; | |
1315 | yp = fYJet; | |
1316 | for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i]; | |
1317 | ||
1318 | } | |
1319 | ||
1320 | void AliPythia6::ConfigHeavyFlavor() | |
1321 | { | |
1322 | // | |
1323 | // Default configuration for Heavy Flavor production | |
1324 | // | |
1325 | // All QCD processes | |
1326 | // | |
1327 | SetMSEL(1); | |
1328 | ||
1329 | // No multiple interactions | |
1330 | SetMSTP(81,0); | |
1331 | SetPARP(81, 0.); | |
1332 | SetPARP(82, 0.); | |
1333 | // Initial/final parton shower on (Pythia default) | |
1334 | SetMSTP(61,1); | |
1335 | SetMSTP(71,1); | |
1336 | ||
1337 | // 2nd order alpha_s | |
1338 | SetMSTP(2,2); | |
1339 | ||
1340 | // QCD scales | |
1341 | SetMSTP(32,2); | |
1342 | SetPARP(34,1.0); | |
1343 | } | |
1344 | ||
1345 | void AliPythia6::AtlasTuning() | |
1346 | { | |
1347 | // | |
1348 | // Configuration for the ATLAS tuning | |
1349 | SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ5L)); | |
1350 | SetMSTP(81,1); // Multiple Interactions ON | |
1351 | SetMSTP(82,4); // Double Gaussian Model | |
1352 | SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14) | |
1353 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy | |
1354 | SetPARP(89,1000.); // [GeV] Ref. energy | |
1355 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
1356 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
1357 | SetPARP(84,0.5); // Core radius | |
1358 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
1359 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
1360 | SetPARP(67,1); // Regulates Initial State Radiation | |
1361 | } | |
1362 | ||
1363 | void AliPythia6::SetPtHardRange(Float_t ptmin, Float_t ptmax) | |
1364 | { | |
1365 | // Set the pt hard range | |
1366 | SetCKIN(3, ptmin); | |
1367 | SetCKIN(4, ptmax); | |
1368 | } | |
1369 | ||
1370 | void AliPythia6::SetYHardRange(Float_t ymin, Float_t ymax) | |
1371 | { | |
1372 | // Set the y hard range | |
1373 | SetCKIN(7, ymin); | |
1374 | SetCKIN(8, ymax); | |
1375 | } | |
1376 | ||
1377 | ||
1378 | void AliPythia6::SetFragmentation(Int_t flag) | |
1379 | { | |
1380 | // Switch fragmentation on/off | |
1381 | SetMSTP(111, flag); | |
1382 | } | |
1383 | ||
1384 | void AliPythia6::SetInitialAndFinalStateRadiation(Int_t flag1, Int_t flag2) | |
1385 | { | |
1386 | // initial state radiation | |
1387 | SetMSTP(61, flag1); | |
1388 | // final state radiation | |
1389 | SetMSTP(71, flag2); | |
1390 | } | |
1391 | ||
1392 | void AliPythia6::SetIntrinsicKt(Float_t kt) | |
1393 | { | |
1394 | // Set the inreinsic kt | |
1395 | if (kt > 0.) { | |
1396 | SetMSTP(91,1); | |
1397 | SetPARP(91,kt); | |
1398 | SetPARP(93, 4. * kt); | |
1399 | } else { | |
1400 | SetMSTP(91,0); | |
1401 | } | |
1402 | } | |
1403 | ||
1404 | void AliPythia6::SwitchHFOff() | |
1405 | { | |
1406 | // Switch off heavy flavor | |
1407 | // Maximum number of quark flavours used in pdf | |
1408 | SetMSTP(58, 3); | |
1409 | // Maximum number of flavors that can be used in showers | |
1410 | SetMSTJ(45, 3); | |
1411 | } | |
1412 | ||
1413 | void AliPythia6::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi, | |
1414 | Float_t thresh, Float_t etseed, Float_t minet, Float_t r) | |
1415 | { | |
1416 | // Set pycell parameters | |
1417 | SetPARU(51, etamax); | |
1418 | SetMSTU(51, neta); | |
1419 | SetMSTU(52, nphi); | |
1420 | SetPARU(58, thresh); | |
1421 | SetPARU(52, etseed); | |
1422 | SetPARU(53, minet); | |
1423 | SetPARU(54, r); | |
1424 | SetMSTU(54, 2); | |
1425 | } | |
1426 | ||
1427 | void AliPythia6::ModifiedSplitting() | |
1428 | { | |
1429 | // Modified splitting probability as a model for quenching | |
1430 | SetPARJ(200, 0.8); | |
1431 | SetMSTJ(41, 1); // QCD radiation only | |
1432 | SetMSTJ(42, 2); // angular ordering | |
1433 | SetMSTJ(44, 2); // option to run alpha_s | |
1434 | SetMSTJ(47, 0); // No correction back to hard scattering element | |
1435 | SetMSTJ(50, 0); // No coherence in first branching | |
1436 | SetPARJ(82, 1.); // Cut off for parton showers | |
1437 | } | |
1438 | ||
1439 | void AliPythia6::SwitchHadronisationOff() | |
1440 | { | |
1441 | // Switch off hadronisarion | |
1442 | SetMSTJ(1, 0); | |
1443 | } | |
1444 | ||
1445 | void AliPythia6::SwitchHadronisationOn() | |
1446 | { | |
1447 | // Switch on hadronisarion | |
1448 | SetMSTJ(1, 1); | |
1449 | } | |
1450 | ||
1451 | ||
1452 | void AliPythia6::GetXandQ(Float_t& x1, Float_t& x2, Float_t& q) | |
1453 | { | |
1454 | // Get x1, x2 and Q for this event | |
1455 | ||
1456 | q = GetVINT(51); | |
1457 | x1 = GetVINT(41); | |
1458 | x2 = GetVINT(42); | |
1459 | } | |
1460 | ||
1461 | Float_t AliPythia6::GetXSection() | |
1462 | { | |
1463 | // Get the total cross-section | |
1464 | return (GetPARI(1)); | |
1465 | } | |
1466 | ||
1467 | Float_t AliPythia6::GetPtHard() | |
1468 | { | |
1469 | // Get the pT hard for this event | |
1470 | return GetVINT(47); | |
1471 | } | |
1472 | ||
1473 | Int_t AliPythia6::ProcessCode() | |
1474 | { | |
1475 | // Get the subprocess code | |
1476 | return GetMSTI(1); | |
1477 | } | |
1478 | ||
1479 | void AliPythia6::PrintStatistics() | |
1480 | { | |
1481 | // End of run statistics | |
1482 | Pystat(1); | |
1483 | } | |
1484 | ||
1485 | void AliPythia6::EventListing() | |
1486 | { | |
1487 | // End of run statistics | |
1488 | Pylist(2); | |
1489 | } | |
1490 | ||
1491 | AliPythia6& AliPythia6::operator=(const AliPythia6& rhs) | |
1492 | { | |
1493 | // Assignment operator | |
1494 | rhs.Copy(*this); | |
1495 | return *this; | |
1496 | } | |
1497 | ||
1498 | void AliPythia6::Copy(TObject&) const | |
1499 | { | |
1500 | // | |
1501 | // Copy | |
1502 | // | |
1503 | Fatal("Copy","Not implemented!\n"); | |
1504 | } |