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_ |
992f2843 |
31 | # define pyquen pyquen_ |
8d2cd130 |
32 | # define type_of_call |
33 | #else |
34 | # define pyclus PYCLUS |
35 | # define pycell PYCELL |
452af8c7 |
36 | # define pyrobo PYROBO |
992f2843 |
37 | # define pyquen PYQUEN |
8d2cd130 |
38 | # define type_of_call _stdcall |
39 | #endif |
40 | |
41 | extern "C" void type_of_call pyclus(Int_t & ); |
42 | extern "C" void type_of_call pycell(Int_t & ); |
452af8c7 |
43 | extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &); |
44 | extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &); |
992f2843 |
45 | extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &); |
8d2cd130 |
46 | |
47 | //_____________________________________________________________________________ |
48 | |
49 | AliPythia* AliPythia::fgAliPythia=NULL; |
50 | |
51 | AliPythia::AliPythia() |
52 | { |
53 | // Default Constructor |
54 | // |
55 | // Set random number |
7cdba479 |
56 | if (!AliPythiaRndm::GetPythiaRandom()) |
57 | AliPythiaRndm::SetPythiaRandom(GetRandom()); |
0f482ae4 |
58 | fGlauber = 0; |
59 | fQuenchingWeights = 0; |
8d2cd130 |
60 | } |
61 | |
62 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) |
63 | { |
64 | // Initialise the process to generate |
7cdba479 |
65 | if (!AliPythiaRndm::GetPythiaRandom()) |
66 | AliPythiaRndm::SetPythiaRandom(GetRandom()); |
8d2cd130 |
67 | |
68 | fProcess = process; |
69 | fEcms = energy; |
70 | fStrucFunc = strucfunc; |
1d5b1b20 |
71 | //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-. |
72 | SetMDCY(Pycomp(111) ,1,0); |
73 | SetMDCY(Pycomp(310) ,1,0); |
74 | SetMDCY(Pycomp(3122),1,0); |
75 | SetMDCY(Pycomp(3112),1,0); |
76 | SetMDCY(Pycomp(3212),1,0); |
77 | SetMDCY(Pycomp(3222),1,0); |
78 | SetMDCY(Pycomp(3312),1,0); |
79 | SetMDCY(Pycomp(3322),1,0); |
80 | SetMDCY(Pycomp(3334),1,0); |
81 | // select structure function |
8d2cd130 |
82 | SetMSTP(52,2); |
83 | SetMSTP(51,strucfunc); |
84 | // |
85 | // Pythia initialisation for selected processes// |
86 | // |
87 | // Make MSEL clean |
88 | // |
89 | for (Int_t i=1; i<= 200; i++) { |
90 | SetMSUB(i,0); |
91 | } |
92 | // select charm production |
93 | switch (process) |
94 | { |
95 | case kPyCharm: |
96 | SetMSEL(4); |
97 | // |
98 | // heavy quark masses |
99 | |
100 | SetPMAS(4,1,1.2); |
101 | SetMSTU(16,2); |
102 | // |
103 | // primordial pT |
104 | SetMSTP(91,1); |
105 | SetPARP(91,1.); |
106 | SetPARP(93,5.); |
107 | // |
108 | break; |
109 | case kPyBeauty: |
110 | SetMSEL(5); |
111 | SetPMAS(5,1,4.75); |
112 | SetMSTU(16,2); |
113 | break; |
114 | case kPyJpsi: |
115 | SetMSEL(0); |
116 | // gg->J/Psi g |
117 | SetMSUB(86,1); |
118 | break; |
119 | case kPyJpsiChi: |
120 | SetMSEL(0); |
121 | // gg->J/Psi g |
122 | SetMSUB(86,1); |
123 | // gg-> chi_0c g |
124 | SetMSUB(87,1); |
125 | // gg-> chi_1c g |
126 | SetMSUB(88,1); |
127 | // gg-> chi_2c g |
128 | SetMSUB(89,1); |
129 | break; |
130 | case kPyCharmUnforced: |
131 | SetMSEL(0); |
132 | // gq->qg |
133 | SetMSUB(28,1); |
134 | // gg->qq |
135 | SetMSUB(53,1); |
136 | // gg->gg |
137 | SetMSUB(68,1); |
138 | break; |
139 | case kPyBeautyUnforced: |
140 | SetMSEL(0); |
141 | // gq->qg |
142 | SetMSUB(28,1); |
143 | // gg->qq |
144 | SetMSUB(53,1); |
145 | // gg->gg |
146 | SetMSUB(68,1); |
147 | break; |
148 | case kPyMb: |
149 | // Minimum Bias pp-Collisions |
150 | // |
151 | // |
152 | // select Pythia min. bias model |
153 | SetMSEL(0); |
511db649 |
154 | SetMSUB(92,1); // single diffraction AB-->XB |
155 | SetMSUB(93,1); // single diffraction AB-->AX |
156 | SetMSUB(94,1); // double diffraction |
157 | SetMSUB(95,1); // low pt production |
158 | |
159 | // |
160 | // ATLAS Tuning |
161 | // |
c01c4118 |
162 | |
163 | SetMSTP(51, kCTEQ5L); // CTEQ5L pdf |
511db649 |
164 | SetMSTP(81,1); // Multiple Interactions ON |
165 | SetMSTP(82,4); // Double Gaussian Model |
166 | |
167 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy |
168 | SetPARP(89,1000.); // [GeV] Ref. energy |
169 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) |
170 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) |
171 | SetPARP(84,0.5); // Core radius |
172 | SetPARP(85,0.33); // Regulates gluon prod. mechanism |
173 | SetPARP(86,0.66); // Regulates gluon prod. mechanism |
174 | SetPARP(67,1); // Regulates Initial State Radiation |
175 | break; |
8d2cd130 |
176 | case kPyMbNonDiffr: |
177 | // Minimum Bias pp-Collisions |
178 | // |
179 | // |
180 | // select Pythia min. bias model |
181 | SetMSEL(0); |
511db649 |
182 | SetMSUB(95,1); // low pt production |
0f482ae4 |
183 | |
184 | // |
185 | // ATLAS Tuning |
186 | // |
511db649 |
187 | |
d682afd1 |
188 | SetMSTP(51,kCTEQ5L); // CTEQ5L pdf |
511db649 |
189 | SetMSTP(81,1); // Multiple Interactions ON |
190 | SetMSTP(82,4); // Double Gaussian Model |
191 | |
192 | SetPARP(82,1.8); // [GeV] PT_min at Ref. energy |
193 | SetPARP(89,1000.); // [GeV] Ref. energy |
194 | SetPARP(90,0.16); // 2*epsilon (exponent in power law) |
195 | SetPARP(83,0.5); // Core density in proton matter distribution (def.value) |
196 | SetPARP(84,0.5); // Core radius |
197 | SetPARP(85,0.33); // Regulates gluon prod. mechanism |
198 | SetPARP(86,0.66); // Regulates gluon prod. mechanism |
199 | SetPARP(67,1); // Regulates Initial State Radiation |
8d2cd130 |
200 | break; |
201 | case kPyJets: |
202 | // |
203 | // QCD Jets |
204 | // |
205 | SetMSEL(1); |
22e6d6b6 |
206 | // |
207 | // Pythia Tune A (CDF) |
208 | // |
209 | SetPARP(67,4.); // Regulates Initial State Radiation |
210 | SetMSTP(82,4); // Double Gaussian Model |
211 | SetPARP(82,2.0); // [GeV] PT_min at Ref. energy |
212 | SetPARP(84,0.4); // Core radius |
213 | SetPARP(85,0.90) ; // Regulates gluon prod. mechanism |
214 | SetPARP(86,0.95); // Regulates gluon prod. mechanism |
215 | SetPARP(89,1800.); // [GeV] Ref. energy |
216 | SetPARP(90,0.25); // 2*epsilon (exponent in power law) |
8d2cd130 |
217 | break; |
218 | case kPyDirectGamma: |
219 | SetMSEL(10); |
220 | break; |
adf4d898 |
221 | case kPyCharmPbPbMNR: |
222 | case kPyD0PbPbMNR: |
8d2cd130 |
223 | // Tuning of Pythia parameters aimed to get a resonable agreement |
224 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
225 | // c-cbar single inclusive and double differential distributions. |
226 | // This parameter settings are meant to work with Pb-Pb collisions |
adf4d898 |
227 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
8d2cd130 |
228 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
229 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. |
230 | |
231 | // All QCD processes |
232 | SetMSEL(1); |
233 | |
234 | // No multiple interactions |
235 | SetMSTP(81,0); |
236 | SetPARP(81,0.0); |
237 | SetPARP(82,0.0); |
238 | |
239 | // Initial/final parton shower on (Pythia default) |
240 | SetMSTP(61,1); |
241 | SetMSTP(71,1); |
242 | |
243 | // 2nd order alpha_s |
244 | SetMSTP(2,2); |
245 | |
246 | // QCD scales |
247 | SetMSTP(32,2); |
248 | SetPARP(34,1.0); |
249 | |
adf4d898 |
250 | // Intrinsic <kT> |
8d2cd130 |
251 | SetMSTP(91,1); |
252 | SetPARP(91,1.304); |
253 | SetPARP(93,6.52); |
254 | |
255 | // Set c-quark mass |
256 | SetPMAS(4,1,1.2); |
257 | |
90d7b703 |
258 | break; |
259 | case kPyDPlusPbPbMNR: |
260 | // Tuning of Pythia parameters aimed to get a resonable agreement |
261 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
262 | // c-cbar single inclusive and double differential distributions. |
263 | // This parameter settings are meant to work with Pb-Pb collisions |
264 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
265 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
266 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. |
267 | |
268 | // All QCD processes |
269 | SetMSEL(1); |
270 | |
271 | // No multiple interactions |
272 | SetMSTP(81,0); |
273 | SetPARP(81,0.0); |
274 | SetPARP(82,0.0); |
275 | |
276 | // Initial/final parton shower on (Pythia default) |
277 | SetMSTP(61,1); |
278 | SetMSTP(71,1); |
279 | |
280 | // 2nd order alpha_s |
281 | SetMSTP(2,2); |
282 | |
283 | // QCD scales |
284 | SetMSTP(32,2); |
285 | SetPARP(34,1.0); |
286 | |
287 | // Intrinsic <kT> |
288 | SetMSTP(91,1); |
289 | SetPARP(91,1.304); |
290 | SetPARP(93,6.52); |
291 | |
292 | // Set c-quark mass |
293 | SetPMAS(4,1,1.2); |
294 | |
8d2cd130 |
295 | break; |
adf4d898 |
296 | case kPyCharmpPbMNR: |
297 | case kPyD0pPbMNR: |
298 | // Tuning of Pythia parameters aimed to get a resonable agreement |
299 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
300 | // c-cbar single inclusive and double differential distributions. |
301 | // This parameter settings are meant to work with p-Pb collisions |
302 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
303 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
304 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. |
305 | |
306 | // All QCD processes |
307 | SetMSEL(1); |
308 | |
309 | // No multiple interactions |
310 | SetMSTP(81,0); |
311 | SetPARP(81,0.0); |
312 | SetPARP(82,0.0); |
313 | |
314 | // Initial/final parton shower on (Pythia default) |
315 | SetMSTP(61,1); |
316 | SetMSTP(71,1); |
317 | |
318 | // 2nd order alpha_s |
319 | SetMSTP(2,2); |
320 | |
321 | // QCD scales |
322 | SetMSTP(32,2); |
323 | SetPARP(34,1.0); |
324 | |
325 | // Intrinsic <kT> |
326 | SetMSTP(91,1); |
327 | SetPARP(91,1.16); |
328 | SetPARP(93,5.8); |
329 | |
330 | // Set c-quark mass |
331 | SetPMAS(4,1,1.2); |
332 | |
90d7b703 |
333 | break; |
334 | case kPyDPluspPbMNR: |
335 | // Tuning of Pythia parameters aimed to get a resonable agreement |
336 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
337 | // c-cbar single inclusive and double differential distributions. |
338 | // This parameter settings are meant to work with p-Pb collisions |
339 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
340 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
341 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. |
342 | |
343 | // All QCD processes |
344 | SetMSEL(1); |
345 | |
346 | // No multiple interactions |
347 | SetMSTP(81,0); |
348 | SetPARP(81,0.0); |
349 | SetPARP(82,0.0); |
350 | |
351 | // Initial/final parton shower on (Pythia default) |
352 | SetMSTP(61,1); |
353 | SetMSTP(71,1); |
354 | |
355 | // 2nd order alpha_s |
356 | SetMSTP(2,2); |
357 | |
358 | // QCD scales |
359 | SetMSTP(32,2); |
360 | SetPARP(34,1.0); |
361 | |
362 | // Intrinsic <kT> |
363 | SetMSTP(91,1); |
364 | SetPARP(91,1.16); |
365 | SetPARP(93,5.8); |
366 | |
367 | // Set c-quark mass |
368 | SetPMAS(4,1,1.2); |
369 | |
adf4d898 |
370 | break; |
371 | case kPyCharmppMNR: |
372 | case kPyD0ppMNR: |
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 | |
381 | // All QCD processes |
382 | SetMSEL(1); |
383 | |
384 | // No multiple interactions |
385 | SetMSTP(81,0); |
386 | SetPARP(81,0.0); |
387 | SetPARP(82,0.0); |
388 | |
389 | // Initial/final parton shower on (Pythia default) |
390 | SetMSTP(61,1); |
391 | SetMSTP(71,1); |
392 | |
393 | // 2nd order alpha_s |
394 | SetMSTP(2,2); |
395 | |
396 | // QCD scales |
397 | SetMSTP(32,2); |
398 | SetPARP(34,1.0); |
399 | |
400 | // Intrinsic <kT^2> |
401 | SetMSTP(91,1); |
402 | SetPARP(91,1.); |
403 | SetPARP(93,5.); |
404 | |
405 | // Set c-quark mass |
406 | SetPMAS(4,1,1.2); |
407 | |
90d7b703 |
408 | break; |
409 | case kPyDPlusppMNR: |
410 | // Tuning of Pythia parameters aimed to get a resonable agreement |
411 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
412 | // c-cbar single inclusive and double differential distributions. |
413 | // This parameter settings are meant to work with pp collisions |
414 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
415 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
416 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. |
417 | |
418 | // All QCD processes |
419 | SetMSEL(1); |
420 | |
421 | // No multiple interactions |
422 | SetMSTP(81,0); |
423 | SetPARP(81,0.0); |
424 | SetPARP(82,0.0); |
425 | |
426 | // Initial/final parton shower on (Pythia default) |
427 | SetMSTP(61,1); |
428 | SetMSTP(71,1); |
429 | |
430 | // 2nd order alpha_s |
431 | SetMSTP(2,2); |
432 | |
433 | // QCD scales |
434 | SetMSTP(32,2); |
435 | SetPARP(34,1.0); |
436 | |
437 | // Intrinsic <kT^2> |
438 | SetMSTP(91,1); |
439 | SetPARP(91,1.); |
440 | SetPARP(93,5.); |
441 | |
442 | // Set c-quark mass |
443 | SetPMAS(4,1,1.2); |
444 | |
adf4d898 |
445 | break; |
446 | case kPyBeautyPbPbMNR: |
8d2cd130 |
447 | // Tuning of Pythia parameters aimed to get a resonable agreement |
448 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
449 | // b-bbar single inclusive and double differential distributions. |
450 | // This parameter settings are meant to work with Pb-Pb collisions |
451 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
452 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
453 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. |
454 | |
455 | // All QCD processes |
456 | SetMSEL(1); |
457 | |
458 | // No multiple interactions |
459 | SetMSTP(81,0); |
460 | SetPARP(81,0.0); |
461 | SetPARP(82,0.0); |
462 | |
463 | // Initial/final parton shower on (Pythia default) |
464 | SetMSTP(61,1); |
465 | SetMSTP(71,1); |
466 | |
467 | // 2nd order alpha_s |
468 | SetMSTP(2,2); |
469 | |
470 | // QCD scales |
471 | SetMSTP(32,2); |
472 | SetPARP(34,1.0); |
473 | SetPARP(67,1.0); |
474 | SetPARP(71,1.0); |
475 | |
adf4d898 |
476 | // Intrinsic <kT> |
8d2cd130 |
477 | SetMSTP(91,1); |
478 | SetPARP(91,2.035); |
479 | SetPARP(93,10.17); |
480 | |
481 | // Set b-quark mass |
482 | SetPMAS(5,1,4.75); |
483 | |
adf4d898 |
484 | break; |
485 | case kPyBeautypPbMNR: |
486 | // Tuning of Pythia parameters aimed to get a resonable agreement |
487 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
488 | // b-bbar single inclusive and double differential distributions. |
489 | // This parameter settings are meant to work with p-Pb collisions |
490 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
491 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
492 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. |
493 | |
494 | // All QCD processes |
495 | SetMSEL(1); |
496 | |
497 | // No multiple interactions |
498 | SetMSTP(81,0); |
499 | SetPARP(81,0.0); |
500 | SetPARP(82,0.0); |
501 | |
502 | // Initial/final parton shower on (Pythia default) |
503 | SetMSTP(61,1); |
504 | SetMSTP(71,1); |
505 | |
506 | // 2nd order alpha_s |
507 | SetMSTP(2,2); |
508 | |
509 | // QCD scales |
510 | SetMSTP(32,2); |
511 | SetPARP(34,1.0); |
512 | SetPARP(67,1.0); |
513 | SetPARP(71,1.0); |
514 | |
515 | // Intrinsic <kT> |
516 | SetMSTP(91,1); |
517 | SetPARP(91,1.60); |
518 | SetPARP(93,8.00); |
519 | |
520 | // Set b-quark mass |
521 | SetPMAS(5,1,4.75); |
522 | |
523 | break; |
524 | case kPyBeautyppMNR: |
525 | // Tuning of Pythia parameters aimed to get a resonable agreement |
526 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the |
527 | // b-bbar single inclusive and double differential distributions. |
528 | // This parameter settings are meant to work with pp collisions |
529 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
530 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
531 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. |
532 | |
533 | // All QCD processes |
534 | SetMSEL(1); |
535 | |
536 | // No multiple interactions |
537 | SetMSTP(81,0); |
538 | SetPARP(81,0.0); |
539 | SetPARP(82,0.0); |
540 | |
541 | // Initial/final parton shower on (Pythia default) |
542 | SetMSTP(61,1); |
543 | SetMSTP(71,1); |
544 | |
545 | // 2nd order alpha_s |
546 | SetMSTP(2,2); |
547 | |
548 | // QCD scales |
549 | SetMSTP(32,2); |
550 | SetPARP(34,1.0); |
551 | SetPARP(67,1.0); |
552 | SetPARP(71,1.0); |
553 | |
554 | // Intrinsic <kT> |
555 | SetMSTP(91,1); |
556 | SetPARP(91,1.); |
557 | SetPARP(93,5.); |
558 | |
559 | // Set b-quark mass |
560 | SetPMAS(5,1,4.75); |
561 | |
8d2cd130 |
562 | break; |
589380c6 |
563 | |
564 | case kPyW: |
565 | |
566 | //Inclusive production of W+/- |
567 | SetMSEL(0); |
568 | //f fbar -> W+ |
569 | SetMSUB(2,1); |
570 | // //f fbar -> g W+ |
571 | // SetMSUB(16,1); |
572 | // //f fbar -> gamma W+ |
573 | // SetMSUB(20,1); |
574 | // //f g -> f W+ |
575 | // SetMSUB(31,1); |
576 | // //f gamma -> f W+ |
577 | // SetMSUB(36,1); |
578 | |
579 | // Initial/final parton shower on (Pythia default) |
580 | // With parton showers on we are generating "W inclusive process" |
581 | SetMSTP(61,1); //Initial QCD & QED showers on |
582 | SetMSTP(71,1); //Final QCD & QED showers on |
583 | |
584 | break; |
8d2cd130 |
585 | } |
586 | // |
587 | // Initialize PYTHIA |
588 | SetMSTP(41,1); // all resonance decays switched on |
589 | |
590 | Initialize("CMS","p","p",fEcms); |
591 | |
592 | } |
593 | |
594 | Int_t AliPythia::CheckedLuComp(Int_t kf) |
595 | { |
596 | // Check Lund particle code (for debugging) |
597 | Int_t kc=Pycomp(kf); |
598 | printf("\n Lucomp kf,kc %d %d",kf,kc); |
599 | return kc; |
600 | } |
601 | |
602 | void AliPythia::SetNuclei(Int_t a1, Int_t a2) |
603 | { |
604 | // Treat protons as inside nuclei with mass numbers a1 and a2 |
605 | // The MSTP array in the PYPARS common block is used to enable and |
606 | // select the nuclear structure functions. |
607 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library |
608 | // =1: internal PYTHIA acording to MSTP(51) |
609 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET |
610 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. |
611 | // MSTP(192) : Mass number of nucleus side 1 |
612 | // MSTP(193) : Mass number of nucleus side 2 |
613 | SetMSTP(52,2); |
614 | SetMSTP(192, a1); |
615 | SetMSTP(193, a2); |
616 | } |
617 | |
618 | |
619 | AliPythia* AliPythia::Instance() |
620 | { |
621 | // Set random number generator |
622 | if (fgAliPythia) { |
623 | return fgAliPythia; |
624 | } else { |
625 | fgAliPythia = new AliPythia(); |
626 | return fgAliPythia; |
627 | } |
628 | } |
629 | |
630 | void AliPythia::PrintParticles() |
631 | { |
632 | // Print list of particl properties |
633 | Int_t np = 0; |
c31f1d37 |
634 | char* name = new char[16]; |
8d2cd130 |
635 | for (Int_t kf=0; kf<1000000; kf++) { |
636 | for (Int_t c = 1; c > -2; c-=2) { |
8d2cd130 |
637 | Int_t kc = Pycomp(c*kf); |
638 | if (kc) { |
639 | Float_t mass = GetPMAS(kc,1); |
640 | Float_t width = GetPMAS(kc,2); |
641 | Float_t tau = GetPMAS(kc,4); |
c31f1d37 |
642 | |
8d2cd130 |
643 | Pyname(kf,name); |
644 | |
645 | np++; |
646 | |
647 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", |
648 | c*kf, name, mass, width, tau); |
649 | } |
650 | } |
651 | } |
652 | printf("\n Number of particles %d \n \n", np); |
653 | } |
654 | |
655 | void AliPythia::ResetDecayTable() |
656 | { |
657 | // Set default values for pythia decay switches |
658 | Int_t i; |
659 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); |
660 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); |
661 | } |
662 | |
663 | void AliPythia::SetDecayTable() |
664 | { |
665 | // Set default values for pythia decay switches |
666 | // |
667 | Int_t i; |
668 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); |
669 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); |
670 | } |
671 | |
672 | void AliPythia::Pyclus(Int_t& njet) |
673 | { |
674 | // Call Pythia clustering algorithm |
675 | // |
676 | pyclus(njet); |
677 | } |
678 | |
679 | void AliPythia::Pycell(Int_t& njet) |
680 | { |
681 | // Call Pythia jet reconstruction algorithm |
682 | // |
683 | pycell(njet); |
684 | } |
685 | |
452af8c7 |
686 | void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax) |
687 | { |
688 | // Call Pythia jet reconstruction algorithm |
689 | // |
452af8c7 |
690 | pyshow(ip1, ip2, qmax); |
691 | } |
692 | |
693 | void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez) |
694 | { |
695 | pyrobo(imi, ima, the, phi, bex, bey, bez); |
696 | } |
697 | |
698 | |
699 | |
86b6ad68 |
700 | void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod) |
0f482ae4 |
701 | { |
702 | // Initializes |
703 | // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann |
704 | // (2) The nuclear geometry using the Glauber Model |
705 | // |
706 | |
707 | |
708 | fGlauber = new AliFastGlauber(); |
709 | fGlauber->Init(2); |
710 | fGlauber->SetCentralityClass(cMin, cMax); |
711 | |
712 | fQuenchingWeights = new AliQuenchingWeights(); |
713 | fQuenchingWeights->InitMult(); |
86b6ad68 |
714 | fQuenchingWeights->SetK(k); |
0f482ae4 |
715 | fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod)); |
0f482ae4 |
716 | } |
717 | |
718 | |
452af8c7 |
719 | void AliPythia::Quench() |
720 | { |
721 | // |
722 | // |
723 | // Simple Jet Quenching routine: |
724 | // ============================= |
725 | // The jet formed by all final state partons radiated by the parton created |
0f482ae4 |
726 | // in the hard collisions is quenched by a factor (1-z) using light cone variables in |
727 | // the initial parton reference frame: |
452af8c7 |
728 | // (E + p_z)new = (1-z) (E + p_z)old |
729 | // |
0f482ae4 |
730 | // |
731 | // |
732 | // |
452af8c7 |
733 | // The lost momentum is first balanced by one gluon with virtuality > 0. |
734 | // Subsequently the gluon splits to yield two gluons with E = p. |
735 | // |
0f482ae4 |
736 | // |
737 | // |
4e383037 |
738 | static Float_t eMean = 0.; |
739 | static Int_t icall = 0; |
0f482ae4 |
740 | |
c2c598a3 |
741 | Double_t p0[4][5]; |
742 | Double_t p1[4][5]; |
743 | Double_t p2[4][5]; |
744 | Int_t klast[4] = {-1, -1, -1, -1}; |
452af8c7 |
745 | |
746 | Int_t numpart = fPyjets->N; |
86b6ad68 |
747 | Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.; |
c2c598a3 |
748 | Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4]; |
749 | Bool_t quenched[4]; |
b280c4cc |
750 | Double_t wjtKick[4]; |
c2c598a3 |
751 | Int_t nGluon[4]; |
86b6ad68 |
752 | Int_t qPdg[4]; |
0f482ae4 |
753 | Int_t imo, kst, pdg; |
b280c4cc |
754 | |
511db649 |
755 | // |
c2c598a3 |
756 | // Sore information about Primary partons |
757 | // |
758 | // j = |
759 | // 0, 1 partons from hard scattering |
760 | // 2, 3 partons from initial state radiation |
761 | // |
762 | for (Int_t i = 2; i <= 7; i++) { |
763 | Int_t j = 0; |
764 | // Skip gluons that participate in hard scattering |
765 | if (i == 4 || i == 5) continue; |
766 | // Gluons from hard Scattering |
767 | if (i == 6 || i == 7) { |
768 | j = i - 6; |
769 | pxq[j] = fPyjets->P[0][i]; |
770 | pyq[j] = fPyjets->P[1][i]; |
771 | pzq[j] = fPyjets->P[2][i]; |
772 | eq[j] = fPyjets->P[3][i]; |
773 | mq[j] = fPyjets->P[4][i]; |
774 | } else { |
775 | // Gluons from initial state radiation |
776 | // |
777 | // Obtain 4-momentum vector from difference between original parton and parton after gluon |
778 | // radiation. Energy is calculated independently because initial state radition does not |
779 | // conserve strictly momentum and energy for each partonic system independently. |
780 | // |
781 | // Not very clean. Should be improved ! |
782 | // |
783 | // |
784 | j = i; |
785 | pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2]; |
786 | pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2]; |
787 | pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2]; |
788 | mq[j] = fPyjets->P[4][i]; |
789 | eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]); |
790 | } |
791 | // |
792 | // Calculate some kinematic variables |
511db649 |
793 | // |
4e383037 |
794 | yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14)); |
0f482ae4 |
795 | pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]); |
796 | phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]); |
797 | ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]); |
798 | thetaq[j] = TMath::ATan2(ptq[j], pzq[j]); |
86b6ad68 |
799 | qPdg[j] = fPyjets->K[1][i]; |
800 | } |
801 | |
802 | Double_t int0[4]; |
803 | Double_t int1[4]; |
86b6ad68 |
804 | |
b280c4cc |
805 | fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.); |
806 | |
86b6ad68 |
807 | for (Int_t j = 0; j < 4; j++) { |
c2c598a3 |
808 | // |
809 | // Quench only central jets and with E > 10. |
810 | // |
86b6ad68 |
811 | |
812 | |
813 | Int_t itype = (qPdg[j] == 21) ? 2 : 1; |
814 | Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]); |
815 | |
c2c598a3 |
816 | if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) { |
b280c4cc |
817 | fZQuench[j] = 0.; |
0f482ae4 |
818 | } else { |
c2c598a3 |
819 | if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) { |
4e383037 |
820 | icall ++; |
821 | eMean += eloss; |
822 | } |
0f482ae4 |
823 | // |
824 | // Extra pt |
86b6ad68 |
825 | Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]); |
826 | wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j])); |
0f482ae4 |
827 | // |
828 | // Fractional energy loss |
b280c4cc |
829 | fZQuench[j] = eloss / eq[j]; |
0f482ae4 |
830 | // |
831 | // Avoid complete loss |
832 | // |
b280c4cc |
833 | if (fZQuench[j] == 1.) fZQuench[j] = 0.95; |
0f482ae4 |
834 | // |
835 | // Some debug printing |
86b6ad68 |
836 | |
837 | |
bf9bb016 |
838 | // 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", |
839 | // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]); |
4e383037 |
840 | |
b280c4cc |
841 | // fZQuench[j] = 0.8; |
842 | // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2); |
0f482ae4 |
843 | } |
4e383037 |
844 | |
b280c4cc |
845 | quenched[j] = (fZQuench[j] > 0.01); |
4e383037 |
846 | } // primary partons |
c2c598a3 |
847 | |
b280c4cc |
848 | |
849 | |
6e90ad26 |
850 | Double_t pNew[1000][4]; |
851 | Int_t kNew[1000]; |
852 | Int_t icount = 0; |
b280c4cc |
853 | Double_t zquench[4]; |
854 | |
6e90ad26 |
855 | // |
4e383037 |
856 | // System Loop |
c2c598a3 |
857 | for (Int_t isys = 0; isys < 4; isys++) { |
6e90ad26 |
858 | // Skip to next system if not quenched. |
4e383037 |
859 | if (!quenched[isys]) continue; |
860 | |
b280c4cc |
861 | nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys])); |
4e383037 |
862 | if (nGluon[isys] > 6) nGluon[isys] = 6; |
b280c4cc |
863 | zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys])); |
4e383037 |
864 | wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys])); |
0f482ae4 |
865 | |
4e383037 |
866 | |
867 | |
868 | Int_t igMin = -1; |
869 | Int_t igMax = -1; |
870 | Double_t pg[4] = {0., 0., 0., 0.}; |
871 | |
872 | // |
873 | // Loop on radiation events |
874 | |
875 | for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) { |
6e90ad26 |
876 | while (1) { |
877 | icount = 0; |
878 | for (Int_t k = 0; k < 4; k++) |
879 | { |
880 | p0[isys][k] = 0.; |
881 | p1[isys][k] = 0.; |
882 | p2[isys][k] = 0.; |
883 | } |
884 | // Loop over partons |
885 | for (Int_t i = 0; i < numpart; i++) |
886 | { |
887 | imo = fPyjets->K[2][i]; |
888 | kst = fPyjets->K[0][i]; |
889 | pdg = fPyjets->K[1][i]; |
890 | |
891 | |
892 | |
0f482ae4 |
893 | // Quarks and gluons only |
6e90ad26 |
894 | if (pdg != 21 && TMath::Abs(pdg) > 6) continue; |
0f482ae4 |
895 | // Particles from hard scattering only |
c2c598a3 |
896 | |
6e90ad26 |
897 | if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1]; |
c2c598a3 |
898 | Int_t imom = imo % 1000; |
899 | if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue; |
900 | if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue; |
901 | |
6e90ad26 |
902 | |
0f482ae4 |
903 | // Skip comment lines |
6e90ad26 |
904 | if (kst != 1 && kst != 2) continue; |
0f482ae4 |
905 | // |
906 | // Parton kinematic |
6e90ad26 |
907 | px = fPyjets->P[0][i]; |
908 | py = fPyjets->P[1][i]; |
909 | pz = fPyjets->P[2][i]; |
910 | e = fPyjets->P[3][i]; |
911 | m = fPyjets->P[4][i]; |
912 | pt = TMath::Sqrt(px * px + py * py); |
913 | p = TMath::Sqrt(px * px + py * py + pz * pz); |
914 | phi = TMath::Pi() + TMath::ATan2(-py, -px); |
915 | theta = TMath::ATan2(pt, pz); |
916 | |
0f482ae4 |
917 | // |
c2c598a3 |
918 | // Save 4-momentum sum for balancing |
919 | Int_t index = isys; |
6e90ad26 |
920 | |
921 | p0[index][0] += px; |
922 | p0[index][1] += py; |
923 | p0[index][2] += pz; |
924 | p0[index][3] += e; |
6e90ad26 |
925 | |
926 | klast[index] = i; |
927 | |
0f482ae4 |
928 | // |
929 | // Fractional energy loss |
b280c4cc |
930 | Double_t z = zquench[index]; |
4e383037 |
931 | |
c2c598a3 |
932 | |
4e383037 |
933 | // Don't fully quench radiated gluons |
934 | // |
935 | if (imo > 1000) { |
936 | // This small factor makes sure that the gluons are not too close in phase space to avoid recombination |
937 | // |
938 | |
c2c598a3 |
939 | z = 0.02; |
4e383037 |
940 | } |
c2c598a3 |
941 | // printf("z: %d %f\n", imo, z); |
942 | |
4e383037 |
943 | |
944 | // |
6e90ad26 |
945 | |
946 | // |
947 | // |
948 | // Transform into frame in which initial parton is along z-axis |
949 | // |
950 | TVector3 v(px, py, pz); |
951 | v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]); |
952 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z(); |
953 | |
954 | Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys); |
955 | Double_t mt2 = jt * jt + m * m; |
956 | Double_t zmax = 1.; |
957 | // |
958 | // Kinematic limit on z |
959 | // |
4e383037 |
960 | if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt); |
6e90ad26 |
961 | // |
962 | // Change light-cone kinematics rel. to initial parton |
963 | // |
964 | Double_t eppzOld = e + pl; |
965 | Double_t empzOld = e - pl; |
966 | |
967 | Double_t eppzNew = (1. - z) * eppzOld; |
968 | Double_t empzNew = empzOld - mt2 * z / eppzOld; |
969 | Double_t eNew = 0.5 * (eppzNew + empzNew); |
970 | Double_t plNew = 0.5 * (eppzNew - empzNew); |
971 | |
972 | Double_t jtNew; |
973 | // |
974 | // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0 |
975 | Double_t mt2New = eppzNew * empzNew; |
976 | if (mt2New < 1.e-8) mt2New = 0.; |
4e383037 |
977 | if (z < zmax) { |
978 | if (m * m > mt2New) { |
979 | // |
980 | // This should not happen |
981 | // |
982 | Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew); |
983 | jtNew = 0; |
984 | } else { |
985 | jtNew = TMath::Sqrt(mt2New - m * m); |
986 | } |
6e90ad26 |
987 | } else { |
4e383037 |
988 | // If pT is to small (probably a leading massive particle) we scale only the energy |
989 | // This can cause negative masses of the radiated gluon |
990 | // Let's hope for the best ... |
991 | jtNew = jt; |
992 | eNew = TMath::Sqrt(plNew * plNew + mt2); |
993 | |
6e90ad26 |
994 | } |
6e90ad26 |
995 | // |
996 | // Calculate new px, py |
997 | // |
998 | Double_t pxNew = jtNew / jt * pxs; |
999 | Double_t pyNew = jtNew / jt * pys; |
1000 | |
1001 | // Double_t dpx = pxs - pxNew; |
1002 | // Double_t dpy = pys - pyNew; |
1003 | // Double_t dpz = pl - plNew; |
1004 | // Double_t de = e - eNew; |
1005 | // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz; |
1006 | // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew); |
1007 | // printf("New mass (2) %e %e \n", pxNew, pyNew); |
1008 | // |
1009 | // Rotate back |
1010 | // |
1011 | TVector3 w(pxNew, pyNew, plNew); |
1012 | w.RotateY(thetaq[index]); w.RotateZ(phiq[index]); |
1013 | pxNew = w.X(); pyNew = w.Y(); plNew = w.Z(); |
1014 | |
1015 | p1[index][0] += pxNew; |
1016 | p1[index][1] += pyNew; |
1017 | p1[index][2] += plNew; |
1018 | p1[index][3] += eNew; |
1019 | // |
1020 | // Updated 4-momentum vectors |
1021 | // |
1022 | pNew[icount][0] = pxNew; |
1023 | pNew[icount][1] = pyNew; |
1024 | pNew[icount][2] = plNew; |
1025 | pNew[icount][3] = eNew; |
1026 | kNew[icount] = i; |
1027 | icount++; |
1028 | } // parton loop |
0f482ae4 |
1029 | // |
6e90ad26 |
1030 | // Check if there was phase-space for quenching |
0f482ae4 |
1031 | // |
0f482ae4 |
1032 | |
6e90ad26 |
1033 | if (icount == 0) quenched[isys] = kFALSE; |
1034 | if (!quenched[isys]) break; |
1035 | |
1036 | for (Int_t j = 0; j < 4; j++) |
1037 | { |
1038 | p2[isys][j] = p0[isys][j] - p1[isys][j]; |
1039 | } |
1040 | 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 |
1041 | if (p2[isys][4] > 0.) { |
1042 | p2[isys][4] = TMath::Sqrt(p2[isys][4]); |
1043 | break; |
1044 | } else { |
b280c4cc |
1045 | printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]); |
4e383037 |
1046 | 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 |
1047 | if (p2[isys][4] < -0.01) { |
4e383037 |
1048 | printf("Negative mass squared !\n"); |
1049 | // Here we have to put the gluon back to mass shell |
1050 | // This will lead to a small energy imbalance |
1051 | p2[isys][4] = 0.; |
1052 | p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]); |
1053 | break; |
6e90ad26 |
1054 | } else { |
1055 | p2[isys][4] = 0.; |
1056 | break; |
1057 | } |
1058 | } |
6e90ad26 |
1059 | /* |
6e90ad26 |
1060 | zHeavy *= 0.98; |
1061 | printf("zHeavy lowered to %f\n", zHeavy); |
1062 | if (zHeavy < 0.01) { |
1063 | printf("No success ! \n"); |
1064 | icount = 0; |
1065 | quenched[isys] = kFALSE; |
1066 | break; |
1067 | } |
4e383037 |
1068 | */ |
1069 | } // iteration on z (while) |
1070 | |
6e90ad26 |
1071 | // Update event record |
1072 | for (Int_t k = 0; k < icount; k++) { |
1073 | // 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] ); |
1074 | fPyjets->P[0][kNew[k]] = pNew[k][0]; |
1075 | fPyjets->P[1][kNew[k]] = pNew[k][1]; |
1076 | fPyjets->P[2][kNew[k]] = pNew[k][2]; |
1077 | fPyjets->P[3][kNew[k]] = pNew[k][3]; |
0f482ae4 |
1078 | } |
4e383037 |
1079 | // |
1080 | // Add the gluons |
1081 | // |
1082 | Int_t ish = 0; |
1837e95c |
1083 | Int_t iGlu; |
4e383037 |
1084 | if (!quenched[isys]) continue; |
0f482ae4 |
1085 | // |
1086 | // Last parton from shower i |
4e383037 |
1087 | Int_t in = klast[isys]; |
0f482ae4 |
1088 | // |
1089 | // Continue if no parton in shower i selected |
1090 | if (in == -1) continue; |
1091 | // |
1092 | // If this is the second initial parton and it is behind the first move pointer by previous ish |
4e383037 |
1093 | if (isys == 1 && klast[1] > klast[0]) in += ish; |
0f482ae4 |
1094 | // |
1095 | // Starting index |
452af8c7 |
1096 | |
4e383037 |
1097 | // jmin = in - 1; |
0f482ae4 |
1098 | // How many additional gluons will be generated |
1099 | ish = 1; |
4e383037 |
1100 | if (p2[isys][4] > 0.05) ish = 2; |
0f482ae4 |
1101 | // |
1102 | // Position of gluons |
4e383037 |
1103 | iGlu = numpart; |
1104 | if (iglu == 0) igMin = iGlu; |
1105 | igMax = iGlu; |
0f482ae4 |
1106 | numpart += ish; |
1107 | (fPyjets->N) += ish; |
4e383037 |
1108 | |
0f482ae4 |
1109 | if (ish == 1) { |
4e383037 |
1110 | fPyjets->P[0][iGlu] = p2[isys][0]; |
1111 | fPyjets->P[1][iGlu] = p2[isys][1]; |
1112 | fPyjets->P[2][iGlu] = p2[isys][2]; |
1113 | fPyjets->P[3][iGlu] = p2[isys][3]; |
1114 | fPyjets->P[4][iGlu] = p2[isys][4]; |
0f482ae4 |
1115 | |
4e383037 |
1116 | fPyjets->K[0][iGlu] = 1; |
1117 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1; |
0f482ae4 |
1118 | fPyjets->K[1][iGlu] = 21; |
4e383037 |
1119 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 |
1120 | fPyjets->K[3][iGlu] = -1; |
1121 | fPyjets->K[4][iGlu] = -1; |
4e383037 |
1122 | |
1123 | pg[0] += p2[isys][0]; |
1124 | pg[1] += p2[isys][1]; |
1125 | pg[2] += p2[isys][2]; |
1126 | pg[3] += p2[isys][3]; |
0f482ae4 |
1127 | } else { |
1128 | // |
1129 | // Split gluon in rest frame. |
1130 | // |
4e383037 |
1131 | Double_t bx = p2[isys][0] / p2[isys][3]; |
1132 | Double_t by = p2[isys][1] / p2[isys][3]; |
1133 | Double_t bz = p2[isys][2] / p2[isys][3]; |
1134 | Double_t pst = p2[isys][4] / 2.; |
0f482ae4 |
1135 | // |
1136 | // Isotropic decay ???? |
1137 | Double_t cost = 2. * gRandom->Rndm() - 1.; |
1138 | Double_t sint = TMath::Sqrt(1. - cost * cost); |
1139 | Double_t phi = 2. * TMath::Pi() * gRandom->Rndm(); |
1140 | |
1141 | Double_t pz1 = pst * cost; |
1142 | Double_t pz2 = -pst * cost; |
1143 | Double_t pt1 = pst * sint; |
1144 | Double_t pt2 = -pst * sint; |
1145 | Double_t px1 = pt1 * TMath::Cos(phi); |
1146 | Double_t py1 = pt1 * TMath::Sin(phi); |
1147 | Double_t px2 = pt2 * TMath::Cos(phi); |
1148 | Double_t py2 = pt2 * TMath::Sin(phi); |
1149 | |
1150 | fPyjets->P[0][iGlu] = px1; |
1151 | fPyjets->P[1][iGlu] = py1; |
1152 | fPyjets->P[2][iGlu] = pz1; |
1153 | fPyjets->P[3][iGlu] = pst; |
1154 | fPyjets->P[4][iGlu] = 0.; |
1155 | |
4e383037 |
1156 | fPyjets->K[0][iGlu] = 1 ; |
0f482ae4 |
1157 | fPyjets->K[1][iGlu] = 21; |
4e383037 |
1158 | fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000; |
0f482ae4 |
1159 | fPyjets->K[3][iGlu] = -1; |
1160 | fPyjets->K[4][iGlu] = -1; |
1161 | |
1162 | fPyjets->P[0][iGlu+1] = px2; |
1163 | fPyjets->P[1][iGlu+1] = py2; |
1164 | fPyjets->P[2][iGlu+1] = pz2; |
1165 | fPyjets->P[3][iGlu+1] = pst; |
1166 | fPyjets->P[4][iGlu+1] = 0.; |
1167 | |
4e383037 |
1168 | fPyjets->K[0][iGlu+1] = 1; |
1169 | if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1; |
0f482ae4 |
1170 | fPyjets->K[1][iGlu+1] = 21; |
4e383037 |
1171 | fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000; |
0f482ae4 |
1172 | fPyjets->K[3][iGlu+1] = -1; |
1173 | fPyjets->K[4][iGlu+1] = -1; |
1174 | SetMSTU(1,0); |
1175 | SetMSTU(2,0); |
1176 | // |
1177 | // Boost back |
1178 | // |
1179 | Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz); |
1180 | } |
4e383037 |
1181 | /* |
1182 | for (Int_t ig = iGlu; ig < iGlu+ish; ig++) { |
1183 | Double_t px, py, pz; |
1184 | px = fPyjets->P[0][ig]; |
1185 | py = fPyjets->P[1][ig]; |
1186 | pz = fPyjets->P[2][ig]; |
1187 | TVector3 v(px, py, pz); |
1188 | v.RotateZ(-phiq[isys]); |
1189 | v.RotateY(-thetaq[isys]); |
1190 | Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z(); |
1191 | Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm(); |
1192 | Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r)); |
1193 | if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.); |
1194 | Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm(); |
1195 | pxs += jtKick * TMath::Cos(phiKick); |
1196 | pys += jtKick * TMath::Sin(phiKick); |
1197 | TVector3 w(pxs, pys, pzs); |
1198 | w.RotateY(thetaq[isys]); |
1199 | w.RotateZ(phiq[isys]); |
1200 | fPyjets->P[0][ig] = w.X(); |
1201 | fPyjets->P[1][ig] = w.Y(); |
1202 | fPyjets->P[2][ig] = w.Z(); |
1203 | fPyjets->P[2][ig] = w.Mag(); |
1204 | } |
1205 | */ |
1206 | } // kGluon |
1207 | |
6e90ad26 |
1208 | |
4e383037 |
1209 | // Check energy conservation |
0f482ae4 |
1210 | Double_t pxs = 0.; |
1211 | Double_t pys = 0.; |
1212 | Double_t pzs = 0.; |
1213 | Double_t es = 14000.; |
1214 | |
1215 | for (Int_t i = 0; i < numpart; i++) |
1216 | { |
1217 | kst = fPyjets->K[0][i]; |
1218 | if (kst != 1 && kst != 2) continue; |
1219 | pxs += fPyjets->P[0][i]; |
1220 | pys += fPyjets->P[1][i]; |
1221 | pzs += fPyjets->P[2][i]; |
1222 | es -= fPyjets->P[3][i]; |
1223 | } |
1224 | if (TMath::Abs(pxs) > 1.e-2 || |
1225 | TMath::Abs(pys) > 1.e-2 || |
1226 | TMath::Abs(pzs) > 1.e-1) { |
1227 | printf("%e %e %e %e\n", pxs, pys, pzs, es); |
4e383037 |
1228 | // Fatal("Quench()", "4-Momentum non-conservation"); |
452af8c7 |
1229 | } |
4e383037 |
1230 | |
1231 | } // end quenching loop (systems) |
6e90ad26 |
1232 | // Clean-up |
0f482ae4 |
1233 | for (Int_t i = 0; i < numpart; i++) |
1234 | { |
4e383037 |
1235 | imo = fPyjets->K[2][i]; |
1236 | if (imo > 1000) { |
1237 | fPyjets->K[2][i] = fPyjets->K[2][i] % 1000; |
1238 | } |
0f482ae4 |
1239 | } |
4e383037 |
1240 | // this->Pylist(1); |
0f482ae4 |
1241 | } // end quench |
90d7b703 |
1242 | |
992f2843 |
1243 | |
1244 | void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b) |
1245 | { |
1246 | // Igor Lokthine's quenching routine |
1247 | pyquen(a, ibf, b); |
1248 | } |
b280c4cc |
1249 | |
1250 | void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4]) |
1251 | { |
1252 | // Return event specific quenching parameters |
1253 | xp = fXJet; |
1254 | yp = fYJet; |
1255 | for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i]; |
1256 | |
1257 | } |
1258 | |