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8d2cd130 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
7cdba479 | 16 | /* $Id$ */ |
8d2cd130 | 17 | |
18 | #include "AliPythia.h" | |
7cdba479 | 19 | #include "AliPythiaRndm.h" |
0f482ae4 | 20 | #include "../FASTSIM/AliFastGlauber.h" |
21 | #include "../FASTSIM/AliQuenchingWeights.h" | |
22 | #include "TVector3.h" | |
8d2cd130 | 23 | |
24 | ClassImp(AliPythia) | |
25 | ||
26 | #ifndef WIN32 | |
27 | # define pyclus pyclus_ | |
28 | # define pycell pycell_ | |
452af8c7 | 29 | # define pyshow pyshow_ |
30 | # define pyrobo pyrobo_ | |
8d2cd130 | 31 | # define type_of_call |
32 | #else | |
33 | # define pyclus PYCLUS | |
34 | # define pycell PYCELL | |
452af8c7 | 35 | # define pyrobo PYROBO |
8d2cd130 | 36 | # define type_of_call _stdcall |
37 | #endif | |
38 | ||
39 | extern "C" void type_of_call pyclus(Int_t & ); | |
40 | extern "C" void type_of_call pycell(Int_t & ); | |
452af8c7 | 41 | extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &); |
42 | extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &); | |
8d2cd130 | 43 | |
44 | //_____________________________________________________________________________ | |
45 | ||
46 | AliPythia* AliPythia::fgAliPythia=NULL; | |
47 | ||
48 | AliPythia::AliPythia() | |
49 | { | |
50 | // Default Constructor | |
51 | // | |
52 | // Set random number | |
7cdba479 | 53 | if (!AliPythiaRndm::GetPythiaRandom()) |
54 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
0f482ae4 | 55 | fGlauber = 0; |
56 | fQuenchingWeights = 0; | |
8d2cd130 | 57 | } |
58 | ||
59 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) | |
60 | { | |
61 | // Initialise the process to generate | |
7cdba479 | 62 | if (!AliPythiaRndm::GetPythiaRandom()) |
63 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
8d2cd130 | 64 | |
65 | fProcess = process; | |
66 | fEcms = energy; | |
67 | fStrucFunc = strucfunc; | |
1d5b1b20 | 68 | //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-. |
69 | SetMDCY(Pycomp(111) ,1,0); | |
70 | SetMDCY(Pycomp(310) ,1,0); | |
71 | SetMDCY(Pycomp(3122),1,0); | |
72 | SetMDCY(Pycomp(3112),1,0); | |
73 | SetMDCY(Pycomp(3212),1,0); | |
74 | SetMDCY(Pycomp(3222),1,0); | |
75 | SetMDCY(Pycomp(3312),1,0); | |
76 | SetMDCY(Pycomp(3322),1,0); | |
77 | SetMDCY(Pycomp(3334),1,0); | |
78 | // select structure function | |
8d2cd130 | 79 | SetMSTP(52,2); |
80 | SetMSTP(51,strucfunc); | |
81 | // | |
82 | // Pythia initialisation for selected processes// | |
83 | // | |
84 | // Make MSEL clean | |
85 | // | |
86 | for (Int_t i=1; i<= 200; i++) { | |
87 | SetMSUB(i,0); | |
88 | } | |
89 | // select charm production | |
90 | switch (process) | |
91 | { | |
92 | case kPyCharm: | |
93 | SetMSEL(4); | |
94 | // | |
95 | // heavy quark masses | |
96 | ||
97 | SetPMAS(4,1,1.2); | |
98 | SetMSTU(16,2); | |
99 | // | |
100 | // primordial pT | |
101 | SetMSTP(91,1); | |
102 | SetPARP(91,1.); | |
103 | SetPARP(93,5.); | |
104 | // | |
105 | break; | |
106 | case kPyBeauty: | |
107 | SetMSEL(5); | |
108 | SetPMAS(5,1,4.75); | |
109 | SetMSTU(16,2); | |
110 | break; | |
111 | case kPyJpsi: | |
112 | SetMSEL(0); | |
113 | // gg->J/Psi g | |
114 | SetMSUB(86,1); | |
115 | break; | |
116 | case kPyJpsiChi: | |
117 | SetMSEL(0); | |
118 | // gg->J/Psi g | |
119 | SetMSUB(86,1); | |
120 | // gg-> chi_0c g | |
121 | SetMSUB(87,1); | |
122 | // gg-> chi_1c g | |
123 | SetMSUB(88,1); | |
124 | // gg-> chi_2c g | |
125 | SetMSUB(89,1); | |
126 | break; | |
127 | case kPyCharmUnforced: | |
128 | SetMSEL(0); | |
129 | // gq->qg | |
130 | SetMSUB(28,1); | |
131 | // gg->qq | |
132 | SetMSUB(53,1); | |
133 | // gg->gg | |
134 | SetMSUB(68,1); | |
135 | break; | |
136 | case kPyBeautyUnforced: | |
137 | SetMSEL(0); | |
138 | // gq->qg | |
139 | SetMSUB(28,1); | |
140 | // gg->qq | |
141 | SetMSUB(53,1); | |
142 | // gg->gg | |
143 | SetMSUB(68,1); | |
144 | break; | |
145 | case kPyMb: | |
146 | // Minimum Bias pp-Collisions | |
147 | // | |
148 | // | |
149 | // select Pythia min. bias model | |
150 | SetMSEL(0); | |
511db649 | 151 | SetMSUB(92,1); // single diffraction AB-->XB |
152 | SetMSUB(93,1); // single diffraction AB-->AX | |
153 | SetMSUB(94,1); // double diffraction | |
154 | SetMSUB(95,1); // low pt production | |
155 | ||
156 | // | |
157 | // ATLAS Tuning | |
158 | // | |
c01c4118 | 159 | |
160 | SetMSTP(51, kCTEQ5L); // CTEQ5L pdf | |
511db649 | 161 | SetMSTP(81,1); // Multiple Interactions ON |
162 | SetMSTP(82,4); // Double Gaussian Model | |
163 | ||
164 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy | |
165 | SetPARP(89,1000.); // [GeV] Ref. energy | |
166 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
167 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
168 | SetPARP(84,0.5); // Core radius | |
169 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
170 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
171 | SetPARP(67,1); // Regulates Initial State Radiation | |
172 | break; | |
8d2cd130 | 173 | case kPyMbNonDiffr: |
174 | // Minimum Bias pp-Collisions | |
175 | // | |
176 | // | |
177 | // select Pythia min. bias model | |
178 | SetMSEL(0); | |
511db649 | 179 | SetMSUB(95,1); // low pt production |
0f482ae4 | 180 | |
181 | // | |
182 | // ATLAS Tuning | |
183 | // | |
511db649 | 184 | |
d682afd1 | 185 | SetMSTP(51,kCTEQ5L); // CTEQ5L pdf |
511db649 | 186 | SetMSTP(81,1); // Multiple Interactions ON |
187 | SetMSTP(82,4); // Double Gaussian Model | |
188 | ||
189 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy | |
190 | SetPARP(89,1000.); // [GeV] Ref. energy | |
191 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) | |
192 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) | |
193 | SetPARP(84,0.5); // Core radius | |
194 | SetPARP(85,0.33); // Regulates gluon prod. mechanism | |
195 | SetPARP(86,0.66); // Regulates gluon prod. mechanism | |
196 | SetPARP(67,1); // Regulates Initial State Radiation | |
8d2cd130 | 197 | break; |
198 | case kPyJets: | |
199 | // | |
200 | // QCD Jets | |
201 | // | |
202 | SetMSEL(1); | |
203 | break; | |
204 | case kPyDirectGamma: | |
205 | SetMSEL(10); | |
206 | break; | |
adf4d898 | 207 | case kPyCharmPbPbMNR: |
208 | case kPyD0PbPbMNR: | |
8d2cd130 | 209 | // Tuning of Pythia parameters aimed to get a resonable agreement |
210 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
211 | // c-cbar single inclusive and double differential distributions. | |
212 | // This parameter settings are meant to work with Pb-Pb collisions | |
adf4d898 | 213 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
8d2cd130 | 214 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
215 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
216 | ||
217 | // All QCD processes | |
218 | SetMSEL(1); | |
219 | ||
220 | // No multiple interactions | |
221 | SetMSTP(81,0); | |
222 | SetPARP(81,0.0); | |
223 | SetPARP(82,0.0); | |
224 | ||
225 | // Initial/final parton shower on (Pythia default) | |
226 | SetMSTP(61,1); | |
227 | SetMSTP(71,1); | |
228 | ||
229 | // 2nd order alpha_s | |
230 | SetMSTP(2,2); | |
231 | ||
232 | // QCD scales | |
233 | SetMSTP(32,2); | |
234 | SetPARP(34,1.0); | |
235 | ||
adf4d898 | 236 | // Intrinsic <kT> |
8d2cd130 | 237 | SetMSTP(91,1); |
238 | SetPARP(91,1.304); | |
239 | SetPARP(93,6.52); | |
240 | ||
241 | // Set c-quark mass | |
242 | SetPMAS(4,1,1.2); | |
243 | ||
90d7b703 | 244 | break; |
245 | case kPyDPlusPbPbMNR: | |
246 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
247 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
248 | // c-cbar single inclusive and double differential distributions. | |
249 | // This parameter settings are meant to work with Pb-Pb collisions | |
250 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
251 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
252 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
253 | ||
254 | // All QCD processes | |
255 | SetMSEL(1); | |
256 | ||
257 | // No multiple interactions | |
258 | SetMSTP(81,0); | |
259 | SetPARP(81,0.0); | |
260 | SetPARP(82,0.0); | |
261 | ||
262 | // Initial/final parton shower on (Pythia default) | |
263 | SetMSTP(61,1); | |
264 | SetMSTP(71,1); | |
265 | ||
266 | // 2nd order alpha_s | |
267 | SetMSTP(2,2); | |
268 | ||
269 | // QCD scales | |
270 | SetMSTP(32,2); | |
271 | SetPARP(34,1.0); | |
272 | ||
273 | // Intrinsic <kT> | |
274 | SetMSTP(91,1); | |
275 | SetPARP(91,1.304); | |
276 | SetPARP(93,6.52); | |
277 | ||
278 | // Set c-quark mass | |
279 | SetPMAS(4,1,1.2); | |
280 | ||
8d2cd130 | 281 | break; |
adf4d898 | 282 | case kPyCharmpPbMNR: |
283 | case kPyD0pPbMNR: | |
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 p-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 | ||
292 | // All QCD processes | |
293 | SetMSEL(1); | |
294 | ||
295 | // No multiple interactions | |
296 | SetMSTP(81,0); | |
297 | SetPARP(81,0.0); | |
298 | SetPARP(82,0.0); | |
299 | ||
300 | // Initial/final parton shower on (Pythia default) | |
301 | SetMSTP(61,1); | |
302 | SetMSTP(71,1); | |
303 | ||
304 | // 2nd order alpha_s | |
305 | SetMSTP(2,2); | |
306 | ||
307 | // QCD scales | |
308 | SetMSTP(32,2); | |
309 | SetPARP(34,1.0); | |
310 | ||
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 | ||
90d7b703 | 319 | break; |
320 | case kPyDPluspPbMNR: | |
321 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
322 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
323 | // c-cbar single inclusive and double differential distributions. | |
324 | // This parameter settings are meant to work with p-Pb collisions | |
325 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
326 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
327 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
328 | ||
329 | // All QCD processes | |
330 | SetMSEL(1); | |
331 | ||
332 | // No multiple interactions | |
333 | SetMSTP(81,0); | |
334 | SetPARP(81,0.0); | |
335 | SetPARP(82,0.0); | |
336 | ||
337 | // Initial/final parton shower on (Pythia default) | |
338 | SetMSTP(61,1); | |
339 | SetMSTP(71,1); | |
340 | ||
341 | // 2nd order alpha_s | |
342 | SetMSTP(2,2); | |
343 | ||
344 | // QCD scales | |
345 | SetMSTP(32,2); | |
346 | SetPARP(34,1.0); | |
347 | ||
348 | // Intrinsic <kT> | |
349 | SetMSTP(91,1); | |
350 | SetPARP(91,1.16); | |
351 | SetPARP(93,5.8); | |
352 | ||
353 | // Set c-quark mass | |
354 | SetPMAS(4,1,1.2); | |
355 | ||
adf4d898 | 356 | break; |
357 | case kPyCharmppMNR: | |
358 | case kPyD0ppMNR: | |
359 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
360 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
361 | // c-cbar single inclusive and double differential distributions. | |
362 | // This parameter settings are meant to work with pp collisions | |
363 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
364 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
365 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
366 | ||
367 | // All QCD processes | |
368 | SetMSEL(1); | |
369 | ||
370 | // No multiple interactions | |
371 | SetMSTP(81,0); | |
372 | SetPARP(81,0.0); | |
373 | SetPARP(82,0.0); | |
374 | ||
375 | // Initial/final parton shower on (Pythia default) | |
376 | SetMSTP(61,1); | |
377 | SetMSTP(71,1); | |
378 | ||
379 | // 2nd order alpha_s | |
380 | SetMSTP(2,2); | |
381 | ||
382 | // QCD scales | |
383 | SetMSTP(32,2); | |
384 | SetPARP(34,1.0); | |
385 | ||
386 | // Intrinsic <kT^2> | |
387 | SetMSTP(91,1); | |
388 | SetPARP(91,1.); | |
389 | SetPARP(93,5.); | |
390 | ||
391 | // Set c-quark mass | |
392 | SetPMAS(4,1,1.2); | |
393 | ||
90d7b703 | 394 | break; |
395 | case kPyDPlusppMNR: | |
396 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
397 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
398 | // c-cbar single inclusive and double differential distributions. | |
399 | // This parameter settings are meant to work with pp collisions | |
400 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
401 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
402 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
403 | ||
404 | // All QCD processes | |
405 | SetMSEL(1); | |
406 | ||
407 | // No multiple interactions | |
408 | SetMSTP(81,0); | |
409 | SetPARP(81,0.0); | |
410 | SetPARP(82,0.0); | |
411 | ||
412 | // Initial/final parton shower on (Pythia default) | |
413 | SetMSTP(61,1); | |
414 | SetMSTP(71,1); | |
415 | ||
416 | // 2nd order alpha_s | |
417 | SetMSTP(2,2); | |
418 | ||
419 | // QCD scales | |
420 | SetMSTP(32,2); | |
421 | SetPARP(34,1.0); | |
422 | ||
423 | // Intrinsic <kT^2> | |
424 | SetMSTP(91,1); | |
425 | SetPARP(91,1.); | |
426 | SetPARP(93,5.); | |
427 | ||
428 | // Set c-quark mass | |
429 | SetPMAS(4,1,1.2); | |
430 | ||
adf4d898 | 431 | break; |
432 | case kPyBeautyPbPbMNR: | |
8d2cd130 | 433 | // Tuning of Pythia parameters aimed to get a resonable agreement |
434 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
435 | // b-bbar single inclusive and double differential distributions. | |
436 | // This parameter settings are meant to work with Pb-Pb collisions | |
437 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
438 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
439 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
440 | ||
441 | // All QCD processes | |
442 | SetMSEL(1); | |
443 | ||
444 | // No multiple interactions | |
445 | SetMSTP(81,0); | |
446 | SetPARP(81,0.0); | |
447 | SetPARP(82,0.0); | |
448 | ||
449 | // Initial/final parton shower on (Pythia default) | |
450 | SetMSTP(61,1); | |
451 | SetMSTP(71,1); | |
452 | ||
453 | // 2nd order alpha_s | |
454 | SetMSTP(2,2); | |
455 | ||
456 | // QCD scales | |
457 | SetMSTP(32,2); | |
458 | SetPARP(34,1.0); | |
459 | SetPARP(67,1.0); | |
460 | SetPARP(71,1.0); | |
461 | ||
adf4d898 | 462 | // Intrinsic <kT> |
8d2cd130 | 463 | SetMSTP(91,1); |
464 | SetPARP(91,2.035); | |
465 | SetPARP(93,10.17); | |
466 | ||
467 | // Set b-quark mass | |
468 | SetPMAS(5,1,4.75); | |
469 | ||
adf4d898 | 470 | break; |
471 | case kPyBeautypPbMNR: | |
472 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
473 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
474 | // b-bbar single inclusive and double differential distributions. | |
475 | // This parameter settings are meant to work with p-Pb collisions | |
476 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
477 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
478 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
479 | ||
480 | // All QCD processes | |
481 | SetMSEL(1); | |
482 | ||
483 | // No multiple interactions | |
484 | SetMSTP(81,0); | |
485 | SetPARP(81,0.0); | |
486 | SetPARP(82,0.0); | |
487 | ||
488 | // Initial/final parton shower on (Pythia default) | |
489 | SetMSTP(61,1); | |
490 | SetMSTP(71,1); | |
491 | ||
492 | // 2nd order alpha_s | |
493 | SetMSTP(2,2); | |
494 | ||
495 | // QCD scales | |
496 | SetMSTP(32,2); | |
497 | SetPARP(34,1.0); | |
498 | SetPARP(67,1.0); | |
499 | SetPARP(71,1.0); | |
500 | ||
501 | // Intrinsic <kT> | |
502 | SetMSTP(91,1); | |
503 | SetPARP(91,1.60); | |
504 | SetPARP(93,8.00); | |
505 | ||
506 | // Set b-quark mass | |
507 | SetPMAS(5,1,4.75); | |
508 | ||
509 | break; | |
510 | case kPyBeautyppMNR: | |
511 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
512 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
513 | // b-bbar single inclusive and double differential distributions. | |
514 | // This parameter settings are meant to work with pp collisions | |
515 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
516 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
517 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
518 | ||
519 | // All QCD processes | |
520 | SetMSEL(1); | |
521 | ||
522 | // No multiple interactions | |
523 | SetMSTP(81,0); | |
524 | SetPARP(81,0.0); | |
525 | SetPARP(82,0.0); | |
526 | ||
527 | // Initial/final parton shower on (Pythia default) | |
528 | SetMSTP(61,1); | |
529 | SetMSTP(71,1); | |
530 | ||
531 | // 2nd order alpha_s | |
532 | SetMSTP(2,2); | |
533 | ||
534 | // QCD scales | |
535 | SetMSTP(32,2); | |
536 | SetPARP(34,1.0); | |
537 | SetPARP(67,1.0); | |
538 | SetPARP(71,1.0); | |
539 | ||
540 | // Intrinsic <kT> | |
541 | SetMSTP(91,1); | |
542 | SetPARP(91,1.); | |
543 | SetPARP(93,5.); | |
544 | ||
545 | // Set b-quark mass | |
546 | SetPMAS(5,1,4.75); | |
547 | ||
8d2cd130 | 548 | break; |
549 | } | |
550 | // | |
551 | // Initialize PYTHIA | |
552 | SetMSTP(41,1); // all resonance decays switched on | |
553 | ||
554 | Initialize("CMS","p","p",fEcms); | |
555 | ||
556 | } | |
557 | ||
558 | Int_t AliPythia::CheckedLuComp(Int_t kf) | |
559 | { | |
560 | // Check Lund particle code (for debugging) | |
561 | Int_t kc=Pycomp(kf); | |
562 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
563 | return kc; | |
564 | } | |
565 | ||
566 | void AliPythia::SetNuclei(Int_t a1, Int_t a2) | |
567 | { | |
568 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
569 | // The MSTP array in the PYPARS common block is used to enable and | |
570 | // select the nuclear structure functions. | |
571 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
572 | // =1: internal PYTHIA acording to MSTP(51) | |
573 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
574 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. | |
575 | // MSTP(192) : Mass number of nucleus side 1 | |
576 | // MSTP(193) : Mass number of nucleus side 2 | |
577 | SetMSTP(52,2); | |
578 | SetMSTP(192, a1); | |
579 | SetMSTP(193, a2); | |
580 | } | |
581 | ||
582 | ||
583 | AliPythia* AliPythia::Instance() | |
584 | { | |
585 | // Set random number generator | |
586 | if (fgAliPythia) { | |
587 | return fgAliPythia; | |
588 | } else { | |
589 | fgAliPythia = new AliPythia(); | |
590 | return fgAliPythia; | |
591 | } | |
592 | } | |
593 | ||
594 | void AliPythia::PrintParticles() | |
595 | { | |
596 | // Print list of particl properties | |
597 | Int_t np = 0; | |
c31f1d37 | 598 | char* name = new char[16]; |
8d2cd130 | 599 | for (Int_t kf=0; kf<1000000; kf++) { |
600 | for (Int_t c = 1; c > -2; c-=2) { | |
8d2cd130 | 601 | Int_t kc = Pycomp(c*kf); |
602 | if (kc) { | |
603 | Float_t mass = GetPMAS(kc,1); | |
604 | Float_t width = GetPMAS(kc,2); | |
605 | Float_t tau = GetPMAS(kc,4); | |
c31f1d37 | 606 | |
8d2cd130 | 607 | Pyname(kf,name); |
608 | ||
609 | np++; | |
610 | ||
611 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
612 | c*kf, name, mass, width, tau); | |
613 | } | |
614 | } | |
615 | } | |
616 | printf("\n Number of particles %d \n \n", np); | |
617 | } | |
618 | ||
619 | void AliPythia::ResetDecayTable() | |
620 | { | |
621 | // Set default values for pythia decay switches | |
622 | Int_t i; | |
623 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
624 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
625 | } | |
626 | ||
627 | void AliPythia::SetDecayTable() | |
628 | { | |
629 | // Set default values for pythia decay switches | |
630 | // | |
631 | Int_t i; | |
632 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
633 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
634 | } | |
635 | ||
636 | void AliPythia::Pyclus(Int_t& njet) | |
637 | { | |
638 | // Call Pythia clustering algorithm | |
639 | // | |
640 | pyclus(njet); | |
641 | } | |
642 | ||
643 | void AliPythia::Pycell(Int_t& njet) | |
644 | { | |
645 | // Call Pythia jet reconstruction algorithm | |
646 | // | |
647 | pycell(njet); | |
648 | } | |
649 | ||
452af8c7 | 650 | void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax) |
651 | { | |
652 | // Call Pythia jet reconstruction algorithm | |
653 | // | |
452af8c7 | 654 | pyshow(ip1, ip2, qmax); |
655 | } | |
656 | ||
657 | void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez) | |
658 | { | |
659 | pyrobo(imi, ima, the, phi, bex, bey, bez); | |
660 | } | |
661 | ||
662 | ||
663 | ||
86b6ad68 | 664 | void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod) |
0f482ae4 | 665 | { |
666 | // Initializes | |
667 | // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann | |
668 | // (2) The nuclear geometry using the Glauber Model | |
669 | // | |
670 | ||
671 | ||
672 | fGlauber = new AliFastGlauber(); | |
673 | fGlauber->Init(2); | |
674 | fGlauber->SetCentralityClass(cMin, cMax); | |
675 | ||
676 | fQuenchingWeights = new AliQuenchingWeights(); | |
677 | fQuenchingWeights->InitMult(); | |
86b6ad68 | 678 | fQuenchingWeights->SetK(k); |
0f482ae4 | 679 | fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod)); |
0f482ae4 | 680 | } |
681 | ||
682 | ||
452af8c7 | 683 | void AliPythia::Quench() |
684 | { | |
685 | // | |
686 | // | |
687 | // Simple Jet Quenching routine: | |
688 | // ============================= | |
689 | // The jet formed by all final state partons radiated by the parton created | |
0f482ae4 | 690 | // in the hard collisions is quenched by a factor (1-z) using light cone variables in |
691 | // the initial parton reference frame: | |
452af8c7 | 692 | // (E + p_z)new = (1-z) (E + p_z)old |
693 | // | |
0f482ae4 | 694 | // |
695 | // | |
696 | // | |
452af8c7 | 697 | // The lost momentum is first balanced by one gluon with virtuality > 0. |
698 | // Subsequently the gluon splits to yield two gluons with E = p. | |
699 | // | |
0f482ae4 | 700 | // |
701 | // | |
4e383037 | 702 | static Float_t eMean = 0.; |
703 | static Int_t icall = 0; | |
0f482ae4 | 704 | |
c2c598a3 | 705 | Double_t p0[4][5]; |
706 | Double_t p1[4][5]; | |
707 | Double_t p2[4][5]; | |
708 | Int_t klast[4] = {-1, -1, -1, -1}; | |
452af8c7 | 709 | |
710 | Int_t numpart = fPyjets->N; | |
86b6ad68 | 711 | Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.; |
c2c598a3 | 712 | Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4]; |
713 | Bool_t quenched[4]; | |
c2c598a3 | 714 | Double_t zInitial[4], wjtKick[4]; |
715 | Int_t nGluon[4]; | |
86b6ad68 | 716 | Int_t qPdg[4]; |
0f482ae4 | 717 | Int_t imo, kst, pdg; |
511db649 | 718 | // |
c2c598a3 | 719 | // Sore information about Primary partons |
720 | // | |
721 | // j = | |
722 | // 0, 1 partons from hard scattering | |
723 | // 2, 3 partons from initial state radiation | |
724 | // | |
725 | for (Int_t i = 2; i <= 7; i++) { | |
726 | Int_t j = 0; | |
727 | // Skip gluons that participate in hard scattering | |
728 | if (i == 4 || i == 5) continue; | |
729 | // Gluons from hard Scattering | |
730 | if (i == 6 || i == 7) { | |
731 | j = i - 6; | |
732 | pxq[j] = fPyjets->P[0][i]; | |
733 | pyq[j] = fPyjets->P[1][i]; | |
734 | pzq[j] = fPyjets->P[2][i]; | |
735 | eq[j] = fPyjets->P[3][i]; | |
736 | mq[j] = fPyjets->P[4][i]; | |
737 | } else { | |
738 | // Gluons from initial state radiation | |
739 | // | |
740 | // Obtain 4-momentum vector from difference between original parton and parton after gluon | |
741 | // radiation. Energy is calculated independently because initial state radition does not | |
742 | // conserve strictly momentum and energy for each partonic system independently. | |
743 | // | |
744 | // Not very clean. Should be improved ! | |
745 | // | |
746 | // | |
747 | j = i; | |
748 | pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2]; | |
749 | pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2]; | |
750 | pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2]; | |
751 | mq[j] = fPyjets->P[4][i]; | |
752 | eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]); | |
753 | } | |
754 | // | |
755 | // Calculate some kinematic variables | |
511db649 | 756 | // |
4e383037 | 757 | yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14)); |
0f482ae4 | 758 | pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]); |
759 | phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]); | |
760 | ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]); | |
761 | thetaq[j] = TMath::ATan2(ptq[j], pzq[j]); | |
86b6ad68 | 762 | qPdg[j] = fPyjets->K[1][i]; |
763 | } | |
764 | ||
765 | Double_t int0[4]; | |
766 | Double_t int1[4]; | |
767 | ||
768 | fGlauber->GetI0I1ForPythia(4, phiq, int0, int1, 15.); | |
769 | ||
770 | for (Int_t j = 0; j < 4; j++) { | |
c2c598a3 | 771 | // |
772 | // Quench only central jets and with E > 10. | |
773 | // | |
86b6ad68 | 774 | |
775 | ||
776 | Int_t itype = (qPdg[j] == 21) ? 2 : 1; | |
777 | Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]); | |
778 | ||
c2c598a3 | 779 | if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) { |
0f482ae4 | 780 | zInitial[j] = 0.; |
781 | } else { | |
c2c598a3 | 782 | if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) { |
4e383037 | 783 | icall ++; |
784 | eMean += eloss; | |
785 | } | |
0f482ae4 | 786 | // |
787 | // Extra pt | |
86b6ad68 | 788 | Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]); |
789 | wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j])); | |
0f482ae4 | 790 | // |
791 | // Fractional energy loss | |
792 | zInitial[j] = eloss / eq[j]; | |
793 | // | |
794 | // Avoid complete loss | |
795 | // | |
796 | if (zInitial[j] == 1.) zInitial[j] = 0.95; | |
797 | // | |
798 | // Some debug printing | |
86b6ad68 | 799 | |
800 | ||
bf9bb016 | 801 | // 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", |
802 | // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]); | |
4e383037 | 803 | |
c2c598a3 | 804 | // zInitial[j] = 0.8; |
805 | // while (zInitial[j] >= 0.95) zInitial[j] = gRandom->Exp(0.2); | |
0f482ae4 | 806 | } |
4e383037 | 807 | |
0f482ae4 | 808 | quenched[j] = (zInitial[j] > 0.01); |
4e383037 | 809 | } // primary partons |
c2c598a3 | 810 | |
6e90ad26 | 811 | Double_t pNew[1000][4]; |
812 | Int_t kNew[1000]; | |
813 | Int_t icount = 0; | |
814 | // | |
4e383037 | 815 | // System Loop |
c2c598a3 | 816 | for (Int_t isys = 0; isys < 4; isys++) { |
6e90ad26 | 817 | // Skip to next system if not quenched. |
4e383037 | 818 | if (!quenched[isys]) continue; |
819 | ||
820 | nGluon[isys] = 1 + Int_t(zInitial[isys] / (1. - zInitial[isys])); | |
821 | if (nGluon[isys] > 6) nGluon[isys] = 6; | |
822 | zInitial[isys] = 1. - TMath::Power(1. - zInitial[isys], 1./Double_t(nGluon[isys])); | |
823 | wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys])); | |
0f482ae4 | 824 | |
4e383037 | 825 | |
826 | ||
827 | Int_t igMin = -1; | |
828 | Int_t igMax = -1; | |
829 | Double_t pg[4] = {0., 0., 0., 0.}; | |
830 | ||
831 | // | |
832 | // Loop on radiation events | |
833 | ||
834 | for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) { | |
6e90ad26 | 835 | while (1) { |
836 | icount = 0; | |
837 | for (Int_t k = 0; k < 4; k++) | |
838 | { | |
839 | p0[isys][k] = 0.; | |
840 | p1[isys][k] = 0.; | |
841 | p2[isys][k] = 0.; | |
842 | } | |
843 | // Loop over partons | |
844 | for (Int_t i = 0; i < numpart; i++) | |
845 | { | |
846 | imo = fPyjets->K[2][i]; | |
847 | kst = fPyjets->K[0][i]; | |
848 | pdg = fPyjets->K[1][i]; | |
849 | ||
850 | ||
851 | ||
0f482ae4 | 852 | // Quarks and gluons only |
6e90ad26 | 853 | if (pdg != 21 && TMath::Abs(pdg) > 6) continue; |
0f482ae4 | 854 | // Particles from hard scattering only |
c2c598a3 | 855 | |
6e90ad26 | 856 | if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1]; |
c2c598a3 | 857 | Int_t imom = imo % 1000; |
858 | if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue; | |
859 | if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue; | |
860 | ||
6e90ad26 | 861 | |
0f482ae4 | 862 | // Skip comment lines |
6e90ad26 | 863 | if (kst != 1 && kst != 2) continue; |
0f482ae4 | 864 | // |
865 | // Parton kinematic | |
6e90ad26 | 866 | px = fPyjets->P[0][i]; |
867 | py = fPyjets->P[1][i]; | |
868 | pz = fPyjets->P[2][i]; | |
869 | e = fPyjets->P[3][i]; | |
870 | m = fPyjets->P[4][i]; | |
871 | pt = TMath::Sqrt(px * px + py * py); | |
872 | p = TMath::Sqrt(px * px + py * py + pz * pz); | |
873 | phi = TMath::Pi() + TMath::ATan2(-py, -px); | |
874 | theta = TMath::ATan2(pt, pz); | |
875 | ||
0f482ae4 | 876 | // |
c2c598a3 | 877 | // Save 4-momentum sum for balancing |
878 | Int_t index = isys; | |
6e90ad26 | 879 | |
880 | p0[index][0] += px; | |
881 | p0[index][1] += py; | |
882 | p0[index][2] += pz; | |
883 | p0[index][3] += e; | |
6e90ad26 | 884 | |
885 | klast[index] = i; | |
886 | ||
0f482ae4 | 887 | // |
888 | // Fractional energy loss | |
6e90ad26 | 889 | Double_t z = zInitial[index]; |
4e383037 | 890 | |
c2c598a3 | 891 | |
4e383037 | 892 | // Don't fully quench radiated gluons |
893 | // | |
894 | if (imo > 1000) { | |
895 | // This small factor makes sure that the gluons are not too close in phase space to avoid recombination | |
896 | // | |
897 | ||
c2c598a3 | 898 | z = 0.02; |
4e383037 | 899 | } |
c2c598a3 | 900 | // printf("z: %d %f\n", imo, z); |
901 | ||
4e383037 | 902 | |
903 | // | |
6e90ad26 | 904 | |
905 | // | |
906 | // | |
907 | // Transform into frame in which initial parton is along z-axis | |
908 | // | |
909 | TVector3 v(px, py, pz); | |
910 | v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]); | |
911 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z(); | |
912 | ||
913 | Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys); | |
914 | Double_t mt2 = jt * jt + m * m; | |
915 | Double_t zmax = 1.; | |
916 | // | |
917 | // Kinematic limit on z | |
918 | // | |
4e383037 | 919 | if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt); |
6e90ad26 | 920 | // |
921 | // Change light-cone kinematics rel. to initial parton | |
922 | // | |
923 | Double_t eppzOld = e + pl; | |
924 | Double_t empzOld = e - pl; | |
925 | ||
926 | Double_t eppzNew = (1. - z) * eppzOld; | |
927 | Double_t empzNew = empzOld - mt2 * z / eppzOld; | |
928 | Double_t eNew = 0.5 * (eppzNew + empzNew); | |
929 | Double_t plNew = 0.5 * (eppzNew - empzNew); | |
930 | ||
931 | Double_t jtNew; | |
932 | // | |
933 | // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0 | |
934 | Double_t mt2New = eppzNew * empzNew; | |
935 | if (mt2New < 1.e-8) mt2New = 0.; | |
4e383037 | 936 | if (z < zmax) { |
937 | if (m * m > mt2New) { | |
938 | // | |
939 | // This should not happen | |
940 | // | |
941 | Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew); | |
942 | jtNew = 0; | |
943 | } else { | |
944 | jtNew = TMath::Sqrt(mt2New - m * m); | |
945 | } | |
6e90ad26 | 946 | } else { |
4e383037 | 947 | // If pT is to small (probably a leading massive particle) we scale only the energy |
948 | // This can cause negative masses of the radiated gluon | |
949 | // Let's hope for the best ... | |
950 | jtNew = jt; | |
951 | eNew = TMath::Sqrt(plNew * plNew + mt2); | |
952 | ||
6e90ad26 | 953 | } |
6e90ad26 | 954 | // |
955 | // Calculate new px, py | |
956 | // | |
957 | Double_t pxNew = jtNew / jt * pxs; | |
958 | Double_t pyNew = jtNew / jt * pys; | |
959 | ||
960 | // Double_t dpx = pxs - pxNew; | |
961 | // Double_t dpy = pys - pyNew; | |
962 | // Double_t dpz = pl - plNew; | |
963 | // Double_t de = e - eNew; | |
964 | // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz; | |
965 | // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew); | |
966 | // printf("New mass (2) %e %e \n", pxNew, pyNew); | |
967 | // | |
968 | // Rotate back | |
969 | // | |
970 | TVector3 w(pxNew, pyNew, plNew); | |
971 | w.RotateY(thetaq[index]); w.RotateZ(phiq[index]); | |
972 | pxNew = w.X(); pyNew = w.Y(); plNew = w.Z(); | |
973 | ||
974 | p1[index][0] += pxNew; | |
975 | p1[index][1] += pyNew; | |
976 | p1[index][2] += plNew; | |
977 | p1[index][3] += eNew; | |
978 | // | |
979 | // Updated 4-momentum vectors | |
980 | // | |
981 | pNew[icount][0] = pxNew; | |
982 | pNew[icount][1] = pyNew; | |
983 | pNew[icount][2] = plNew; | |
984 | pNew[icount][3] = eNew; | |
985 | kNew[icount] = i; | |
986 | icount++; | |
987 | } // parton loop | |
0f482ae4 | 988 | // |
6e90ad26 | 989 | // Check if there was phase-space for quenching |
0f482ae4 | 990 | // |
0f482ae4 | 991 | |
6e90ad26 | 992 | if (icount == 0) quenched[isys] = kFALSE; |
993 | if (!quenched[isys]) break; | |
994 | ||
995 | for (Int_t j = 0; j < 4; j++) | |
996 | { | |
997 | p2[isys][j] = p0[isys][j] - p1[isys][j]; | |
998 | } | |
999 | p2[isys][4] = p2[isys][3] * p2[isys][3] - p2[isys][0] * p2[isys][0] - p2[isys][1] * p2[isys][1] - p2[isys][2] * p2[isys][2]; | |
6e90ad26 | 1000 | if (p2[isys][4] > 0.) { |
1001 | p2[isys][4] = TMath::Sqrt(p2[isys][4]); | |
1002 | break; | |
1003 | } else { | |
1004 | printf("Warning negative mass squared in system %d %f ! \n", isys, zInitial[isys]); | |
4e383037 | 1005 | printf("4-Momentum: %10.3e %10.3e %10.3e %10.3e %10.3e \n", p2[isys][0], p2[isys][1], p2[isys][2], p2[isys][3], p2[isys][4]); |
6e90ad26 | 1006 | if (p2[isys][4] < -0.01) { |
4e383037 | 1007 | printf("Negative mass squared !\n"); |
1008 | // Here we have to put the gluon back to mass shell | |
1009 | // This will lead to a small energy imbalance | |
1010 | p2[isys][4] = 0.; | |
1011 | p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]); | |
1012 | break; | |
6e90ad26 | 1013 | } else { |
1014 | p2[isys][4] = 0.; | |
1015 | break; | |
1016 | } | |
1017 | } | |
6e90ad26 | 1018 | /* |
6e90ad26 | 1019 | zHeavy *= 0.98; |
1020 | printf("zHeavy lowered to %f\n", zHeavy); | |
1021 | if (zHeavy < 0.01) { | |
1022 | printf("No success ! \n"); | |
1023 | icount = 0; | |
1024 | quenched[isys] = kFALSE; | |
1025 | break; | |
1026 | } | |
4e383037 | 1027 | */ |
1028 | } // iteration on z (while) | |
1029 | ||
6e90ad26 | 1030 | // Update event record |
1031 | for (Int_t k = 0; k < icount; k++) { | |
1032 | // 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] ); | |
1033 | fPyjets->P[0][kNew[k]] = pNew[k][0]; | |
1034 | fPyjets->P[1][kNew[k]] = pNew[k][1]; | |
1035 | fPyjets->P[2][kNew[k]] = pNew[k][2]; | |
1036 | fPyjets->P[3][kNew[k]] = pNew[k][3]; | |
0f482ae4 | 1037 | } |
4e383037 | 1038 | // |
1039 | // Add the gluons | |
1040 | // | |
1041 | Int_t ish = 0; | |
1837e95c | 1042 | Int_t iGlu; |
4e383037 | 1043 | if (!quenched[isys]) continue; |
0f482ae4 | 1044 | // |
1045 | // Last parton from shower i | |
4e383037 | 1046 | Int_t in = klast[isys]; |
0f482ae4 | 1047 | // |
1048 | // Continue if no parton in shower i selected | |
1049 | if (in == -1) continue; | |
1050 | // | |
1051 | // If this is the second initial parton and it is behind the first move pointer by previous ish | |
4e383037 | 1052 | if (isys == 1 && klast[1] > klast[0]) in += ish; |
0f482ae4 | 1053 | // |
1054 | // Starting index | |
452af8c7 | 1055 | |
4e383037 | 1056 | // jmin = in - 1; |
0f482ae4 | 1057 | // How many additional gluons will be generated |
1058 | ish = 1; | |
4e383037 | 1059 | if (p2[isys][4] > 0.05) ish = 2; |
0f482ae4 | 1060 | // |
1061 | // Position of gluons | |
4e383037 | 1062 | iGlu = numpart; |
1063 | if (iglu == 0) igMin = iGlu; | |
1064 | igMax = iGlu; | |
0f482ae4 | 1065 | numpart += ish; |
1066 | (fPyjets->N) += ish; | |
4e383037 | 1067 | |
0f482ae4 | 1068 | if (ish == 1) { |
4e383037 | 1069 | fPyjets->P[0][iGlu] = p2[isys][0]; |
1070 | fPyjets->P[1][iGlu] = p2[isys][1]; | |
1071 | fPyjets->P[2][iGlu] = p2[isys][2]; | |
1072 | fPyjets->P[3][iGlu] = p2[isys][3]; | |
1073 | fPyjets->P[4][iGlu] = p2[isys][4]; | |
0f482ae4 | 1074 | |
4e383037 | 1075 | fPyjets->K[0][iGlu] = 1; |
1076 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1; | |
0f482ae4 | 1077 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1078 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1079 | fPyjets->K[3][iGlu] = -1; |
1080 | fPyjets->K[4][iGlu] = -1; | |
4e383037 | 1081 | |
1082 | pg[0] += p2[isys][0]; | |
1083 | pg[1] += p2[isys][1]; | |
1084 | pg[2] += p2[isys][2]; | |
1085 | pg[3] += p2[isys][3]; | |
0f482ae4 | 1086 | } else { |
1087 | // | |
1088 | // Split gluon in rest frame. | |
1089 | // | |
4e383037 | 1090 | Double_t bx = p2[isys][0] / p2[isys][3]; |
1091 | Double_t by = p2[isys][1] / p2[isys][3]; | |
1092 | Double_t bz = p2[isys][2] / p2[isys][3]; | |
1093 | Double_t pst = p2[isys][4] / 2.; | |
0f482ae4 | 1094 | // |
1095 | // Isotropic decay ???? | |
1096 | Double_t cost = 2. * gRandom->Rndm() - 1.; | |
1097 | Double_t sint = TMath::Sqrt(1. - cost * cost); | |
1098 | Double_t phi = 2. * TMath::Pi() * gRandom->Rndm(); | |
1099 | ||
1100 | Double_t pz1 = pst * cost; | |
1101 | Double_t pz2 = -pst * cost; | |
1102 | Double_t pt1 = pst * sint; | |
1103 | Double_t pt2 = -pst * sint; | |
1104 | Double_t px1 = pt1 * TMath::Cos(phi); | |
1105 | Double_t py1 = pt1 * TMath::Sin(phi); | |
1106 | Double_t px2 = pt2 * TMath::Cos(phi); | |
1107 | Double_t py2 = pt2 * TMath::Sin(phi); | |
1108 | ||
1109 | fPyjets->P[0][iGlu] = px1; | |
1110 | fPyjets->P[1][iGlu] = py1; | |
1111 | fPyjets->P[2][iGlu] = pz1; | |
1112 | fPyjets->P[3][iGlu] = pst; | |
1113 | fPyjets->P[4][iGlu] = 0.; | |
1114 | ||
4e383037 | 1115 | fPyjets->K[0][iGlu] = 1 ; |
0f482ae4 | 1116 | fPyjets->K[1][iGlu] = 21; |
4e383037 | 1117 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1118 | fPyjets->K[3][iGlu] = -1; |
1119 | fPyjets->K[4][iGlu] = -1; | |
1120 | ||
1121 | fPyjets->P[0][iGlu+1] = px2; | |
1122 | fPyjets->P[1][iGlu+1] = py2; | |
1123 | fPyjets->P[2][iGlu+1] = pz2; | |
1124 | fPyjets->P[3][iGlu+1] = pst; | |
1125 | fPyjets->P[4][iGlu+1] = 0.; | |
1126 | ||
4e383037 | 1127 | fPyjets->K[0][iGlu+1] = 1; |
1128 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1; | |
0f482ae4 | 1129 | fPyjets->K[1][iGlu+1] = 21; |
4e383037 | 1130 | fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000; |
0f482ae4 | 1131 | fPyjets->K[3][iGlu+1] = -1; |
1132 | fPyjets->K[4][iGlu+1] = -1; | |
1133 | SetMSTU(1,0); | |
1134 | SetMSTU(2,0); | |
1135 | // | |
1136 | // Boost back | |
1137 | // | |
1138 | Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz); | |
1139 | } | |
4e383037 | 1140 | /* |
1141 | for (Int_t ig = iGlu; ig < iGlu+ish; ig++) { | |
1142 | Double_t px, py, pz; | |
1143 | px = fPyjets->P[0][ig]; | |
1144 | py = fPyjets->P[1][ig]; | |
1145 | pz = fPyjets->P[2][ig]; | |
1146 | TVector3 v(px, py, pz); | |
1147 | v.RotateZ(-phiq[isys]); | |
1148 | v.RotateY(-thetaq[isys]); | |
1149 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z(); | |
1150 | Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1151 | Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r)); | |
1152 | if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.); | |
1153 | Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm(); | |
1154 | pxs += jtKick * TMath::Cos(phiKick); | |
1155 | pys += jtKick * TMath::Sin(phiKick); | |
1156 | TVector3 w(pxs, pys, pzs); | |
1157 | w.RotateY(thetaq[isys]); | |
1158 | w.RotateZ(phiq[isys]); | |
1159 | fPyjets->P[0][ig] = w.X(); | |
1160 | fPyjets->P[1][ig] = w.Y(); | |
1161 | fPyjets->P[2][ig] = w.Z(); | |
1162 | fPyjets->P[2][ig] = w.Mag(); | |
1163 | } | |
1164 | */ | |
1165 | } // kGluon | |
1166 | ||
6e90ad26 | 1167 | |
4e383037 | 1168 | // Check energy conservation |
0f482ae4 | 1169 | Double_t pxs = 0.; |
1170 | Double_t pys = 0.; | |
1171 | Double_t pzs = 0.; | |
1172 | Double_t es = 14000.; | |
1173 | ||
1174 | for (Int_t i = 0; i < numpart; i++) | |
1175 | { | |
1176 | kst = fPyjets->K[0][i]; | |
1177 | if (kst != 1 && kst != 2) continue; | |
1178 | pxs += fPyjets->P[0][i]; | |
1179 | pys += fPyjets->P[1][i]; | |
1180 | pzs += fPyjets->P[2][i]; | |
1181 | es -= fPyjets->P[3][i]; | |
1182 | } | |
1183 | if (TMath::Abs(pxs) > 1.e-2 || | |
1184 | TMath::Abs(pys) > 1.e-2 || | |
1185 | TMath::Abs(pzs) > 1.e-1) { | |
1186 | printf("%e %e %e %e\n", pxs, pys, pzs, es); | |
4e383037 | 1187 | // Fatal("Quench()", "4-Momentum non-conservation"); |
452af8c7 | 1188 | } |
4e383037 | 1189 | |
1190 | } // end quenching loop (systems) | |
6e90ad26 | 1191 | // Clean-up |
0f482ae4 | 1192 | for (Int_t i = 0; i < numpart; i++) |
1193 | { | |
4e383037 | 1194 | imo = fPyjets->K[2][i]; |
1195 | if (imo > 1000) { | |
1196 | fPyjets->K[2][i] = fPyjets->K[2][i] % 1000; | |
1197 | } | |
0f482ae4 | 1198 | } |
4e383037 | 1199 | // this->Pylist(1); |
0f482ae4 | 1200 | } // end quench |
90d7b703 | 1201 |