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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" |
8d2cd130 | 20 | |
21 | ClassImp(AliPythia) | |
22 | ||
23 | #ifndef WIN32 | |
24 | # define pyclus pyclus_ | |
25 | # define pycell pycell_ | |
26 | # define type_of_call | |
27 | #else | |
28 | # define pyclus PYCLUS | |
29 | # define pycell PYCELL | |
30 | # define type_of_call _stdcall | |
31 | #endif | |
32 | ||
33 | extern "C" void type_of_call pyclus(Int_t & ); | |
34 | extern "C" void type_of_call pycell(Int_t & ); | |
35 | ||
36 | //_____________________________________________________________________________ | |
37 | ||
38 | AliPythia* AliPythia::fgAliPythia=NULL; | |
39 | ||
40 | AliPythia::AliPythia() | |
41 | { | |
42 | // Default Constructor | |
43 | // | |
44 | // Set random number | |
7cdba479 | 45 | if (!AliPythiaRndm::GetPythiaRandom()) |
46 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
8d2cd130 | 47 | |
48 | } | |
49 | ||
50 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) | |
51 | { | |
52 | // Initialise the process to generate | |
7cdba479 | 53 | if (!AliPythiaRndm::GetPythiaRandom()) |
54 | AliPythiaRndm::SetPythiaRandom(GetRandom()); | |
8d2cd130 | 55 | |
56 | fProcess = process; | |
57 | fEcms = energy; | |
58 | fStrucFunc = strucfunc; | |
59 | // don't decay p0 | |
60 | SetMDCY(Pycomp(111),1,0); | |
61 | // select structure function | |
62 | SetMSTP(52,2); | |
63 | SetMSTP(51,strucfunc); | |
64 | // | |
65 | // Pythia initialisation for selected processes// | |
66 | // | |
67 | // Make MSEL clean | |
68 | // | |
69 | for (Int_t i=1; i<= 200; i++) { | |
70 | SetMSUB(i,0); | |
71 | } | |
72 | // select charm production | |
73 | switch (process) | |
74 | { | |
75 | case kPyCharm: | |
76 | SetMSEL(4); | |
77 | // | |
78 | // heavy quark masses | |
79 | ||
80 | SetPMAS(4,1,1.2); | |
81 | SetMSTU(16,2); | |
82 | // | |
83 | // primordial pT | |
84 | SetMSTP(91,1); | |
85 | SetPARP(91,1.); | |
86 | SetPARP(93,5.); | |
87 | // | |
88 | break; | |
89 | case kPyBeauty: | |
90 | SetMSEL(5); | |
91 | SetPMAS(5,1,4.75); | |
92 | SetMSTU(16,2); | |
93 | break; | |
94 | case kPyJpsi: | |
95 | SetMSEL(0); | |
96 | // gg->J/Psi g | |
97 | SetMSUB(86,1); | |
98 | break; | |
99 | case kPyJpsiChi: | |
100 | SetMSEL(0); | |
101 | // gg->J/Psi g | |
102 | SetMSUB(86,1); | |
103 | // gg-> chi_0c g | |
104 | SetMSUB(87,1); | |
105 | // gg-> chi_1c g | |
106 | SetMSUB(88,1); | |
107 | // gg-> chi_2c g | |
108 | SetMSUB(89,1); | |
109 | break; | |
110 | case kPyCharmUnforced: | |
111 | SetMSEL(0); | |
112 | // gq->qg | |
113 | SetMSUB(28,1); | |
114 | // gg->qq | |
115 | SetMSUB(53,1); | |
116 | // gg->gg | |
117 | SetMSUB(68,1); | |
118 | break; | |
119 | case kPyBeautyUnforced: | |
120 | SetMSEL(0); | |
121 | // gq->qg | |
122 | SetMSUB(28,1); | |
123 | // gg->qq | |
124 | SetMSUB(53,1); | |
125 | // gg->gg | |
126 | SetMSUB(68,1); | |
127 | break; | |
128 | case kPyMb: | |
129 | // Minimum Bias pp-Collisions | |
130 | // | |
131 | // | |
132 | // select Pythia min. bias model | |
133 | SetMSEL(0); | |
134 | SetMSUB(92,1); // single diffraction AB-->XB | |
135 | SetMSUB(93,1); // single diffraction AB-->AX | |
136 | SetMSUB(94,1); // double diffraction | |
137 | SetMSUB(95,1); // low pt production | |
138 | SetMSTP(81,1); // multiple interactions switched on | |
139 | SetMSTP(82,3); // model with varying impact param. & a single Gaussian | |
140 | SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of | |
141 | // multiple interaction at a reference energy = 14000 GeV | |
142 | SetPARP(89,14000.); // reference energy for the above parameter | |
143 | SetPARP(90,0.174); // set exponent for energy dependence of pT_0 | |
144 | case kPyMbNonDiffr: | |
145 | // Minimum Bias pp-Collisions | |
146 | // | |
147 | // | |
148 | // select Pythia min. bias model | |
149 | SetMSEL(0); | |
150 | SetMSUB(95,1); // low pt production | |
151 | SetMSTP(81,1); // multiple interactions switched on | |
152 | SetMSTP(82,3); // model with varying impact param. & a single Gaussian | |
153 | SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of | |
154 | // multiple interaction at a reference energy = 14000 GeV | |
155 | SetPARP(89,14000.); // reference energy for the above parameter | |
156 | SetPARP(90,0.174); // set exponent for energy dependence of pT_0 | |
157 | ||
158 | break; | |
159 | case kPyJets: | |
160 | // | |
161 | // QCD Jets | |
162 | // | |
163 | SetMSEL(1); | |
164 | break; | |
165 | case kPyDirectGamma: | |
166 | SetMSEL(10); | |
167 | break; | |
adf4d898 | 168 | case kPyCharmPbPbMNR: |
169 | case kPyD0PbPbMNR: | |
8d2cd130 | 170 | // Tuning of Pythia parameters aimed to get a resonable agreement |
171 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
172 | // c-cbar single inclusive and double differential distributions. | |
173 | // This parameter settings are meant to work with Pb-Pb collisions | |
adf4d898 | 174 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. |
8d2cd130 | 175 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) |
176 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
177 | ||
178 | // All QCD processes | |
179 | SetMSEL(1); | |
180 | ||
181 | // No multiple interactions | |
182 | SetMSTP(81,0); | |
183 | SetPARP(81,0.0); | |
184 | SetPARP(82,0.0); | |
185 | ||
186 | // Initial/final parton shower on (Pythia default) | |
187 | SetMSTP(61,1); | |
188 | SetMSTP(71,1); | |
189 | ||
190 | // 2nd order alpha_s | |
191 | SetMSTP(2,2); | |
192 | ||
193 | // QCD scales | |
194 | SetMSTP(32,2); | |
195 | SetPARP(34,1.0); | |
196 | ||
adf4d898 | 197 | // Intrinsic <kT> |
8d2cd130 | 198 | SetMSTP(91,1); |
199 | SetPARP(91,1.304); | |
200 | SetPARP(93,6.52); | |
201 | ||
202 | // Set c-quark mass | |
203 | SetPMAS(4,1,1.2); | |
204 | ||
205 | break; | |
adf4d898 | 206 | case kPyCharmpPbMNR: |
207 | case kPyD0pPbMNR: | |
208 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
209 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
210 | // c-cbar single inclusive and double differential distributions. | |
211 | // This parameter settings are meant to work with p-Pb collisions | |
212 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
213 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
214 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
215 | ||
216 | // All QCD processes | |
217 | SetMSEL(1); | |
218 | ||
219 | // No multiple interactions | |
220 | SetMSTP(81,0); | |
221 | SetPARP(81,0.0); | |
222 | SetPARP(82,0.0); | |
223 | ||
224 | // Initial/final parton shower on (Pythia default) | |
225 | SetMSTP(61,1); | |
226 | SetMSTP(71,1); | |
227 | ||
228 | // 2nd order alpha_s | |
229 | SetMSTP(2,2); | |
230 | ||
231 | // QCD scales | |
232 | SetMSTP(32,2); | |
233 | SetPARP(34,1.0); | |
234 | ||
235 | // Intrinsic <kT> | |
236 | SetMSTP(91,1); | |
237 | SetPARP(91,1.16); | |
238 | SetPARP(93,5.8); | |
239 | ||
240 | // Set c-quark mass | |
241 | SetPMAS(4,1,1.2); | |
242 | ||
243 | break; | |
244 | case kPyCharmppMNR: | |
245 | case kPyD0ppMNR: | |
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 pp 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^2> | |
274 | SetMSTP(91,1); | |
275 | SetPARP(91,1.); | |
276 | SetPARP(93,5.); | |
277 | ||
278 | // Set c-quark mass | |
279 | SetPMAS(4,1,1.2); | |
280 | ||
281 | break; | |
282 | case kPyBeautyPbPbMNR: | |
8d2cd130 | 283 | // Tuning of Pythia parameters aimed to get a resonable agreement |
284 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
285 | // b-bbar single inclusive and double differential distributions. | |
286 | // This parameter settings are meant to work with Pb-Pb collisions | |
287 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
288 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
289 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
290 | ||
291 | // All QCD processes | |
292 | SetMSEL(1); | |
293 | ||
294 | // No multiple interactions | |
295 | SetMSTP(81,0); | |
296 | SetPARP(81,0.0); | |
297 | SetPARP(82,0.0); | |
298 | ||
299 | // Initial/final parton shower on (Pythia default) | |
300 | SetMSTP(61,1); | |
301 | SetMSTP(71,1); | |
302 | ||
303 | // 2nd order alpha_s | |
304 | SetMSTP(2,2); | |
305 | ||
306 | // QCD scales | |
307 | SetMSTP(32,2); | |
308 | SetPARP(34,1.0); | |
309 | SetPARP(67,1.0); | |
310 | SetPARP(71,1.0); | |
311 | ||
adf4d898 | 312 | // Intrinsic <kT> |
8d2cd130 | 313 | SetMSTP(91,1); |
314 | SetPARP(91,2.035); | |
315 | SetPARP(93,10.17); | |
316 | ||
317 | // Set b-quark mass | |
318 | SetPMAS(5,1,4.75); | |
319 | ||
adf4d898 | 320 | break; |
321 | case kPyBeautypPbMNR: | |
322 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
323 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
324 | // b-bbar single inclusive and double differential distributions. | |
325 | // This parameter settings are meant to work with p-Pb collisions | |
326 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
327 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
328 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
329 | ||
330 | // All QCD processes | |
331 | SetMSEL(1); | |
332 | ||
333 | // No multiple interactions | |
334 | SetMSTP(81,0); | |
335 | SetPARP(81,0.0); | |
336 | SetPARP(82,0.0); | |
337 | ||
338 | // Initial/final parton shower on (Pythia default) | |
339 | SetMSTP(61,1); | |
340 | SetMSTP(71,1); | |
341 | ||
342 | // 2nd order alpha_s | |
343 | SetMSTP(2,2); | |
344 | ||
345 | // QCD scales | |
346 | SetMSTP(32,2); | |
347 | SetPARP(34,1.0); | |
348 | SetPARP(67,1.0); | |
349 | SetPARP(71,1.0); | |
350 | ||
351 | // Intrinsic <kT> | |
352 | SetMSTP(91,1); | |
353 | SetPARP(91,1.60); | |
354 | SetPARP(93,8.00); | |
355 | ||
356 | // Set b-quark mass | |
357 | SetPMAS(5,1,4.75); | |
358 | ||
359 | break; | |
360 | case kPyBeautyppMNR: | |
361 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
362 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
363 | // b-bbar single inclusive and double differential distributions. | |
364 | // This parameter settings are meant to work with pp collisions | |
365 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
366 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
367 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
368 | ||
369 | // All QCD processes | |
370 | SetMSEL(1); | |
371 | ||
372 | // No multiple interactions | |
373 | SetMSTP(81,0); | |
374 | SetPARP(81,0.0); | |
375 | SetPARP(82,0.0); | |
376 | ||
377 | // Initial/final parton shower on (Pythia default) | |
378 | SetMSTP(61,1); | |
379 | SetMSTP(71,1); | |
380 | ||
381 | // 2nd order alpha_s | |
382 | SetMSTP(2,2); | |
383 | ||
384 | // QCD scales | |
385 | SetMSTP(32,2); | |
386 | SetPARP(34,1.0); | |
387 | SetPARP(67,1.0); | |
388 | SetPARP(71,1.0); | |
389 | ||
390 | // Intrinsic <kT> | |
391 | SetMSTP(91,1); | |
392 | SetPARP(91,1.); | |
393 | SetPARP(93,5.); | |
394 | ||
395 | // Set b-quark mass | |
396 | SetPMAS(5,1,4.75); | |
397 | ||
8d2cd130 | 398 | break; |
399 | } | |
400 | // | |
401 | // Initialize PYTHIA | |
402 | SetMSTP(41,1); // all resonance decays switched on | |
403 | ||
404 | Initialize("CMS","p","p",fEcms); | |
405 | ||
406 | } | |
407 | ||
408 | Int_t AliPythia::CheckedLuComp(Int_t kf) | |
409 | { | |
410 | // Check Lund particle code (for debugging) | |
411 | Int_t kc=Pycomp(kf); | |
412 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
413 | return kc; | |
414 | } | |
415 | ||
416 | void AliPythia::SetNuclei(Int_t a1, Int_t a2) | |
417 | { | |
418 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
419 | // The MSTP array in the PYPARS common block is used to enable and | |
420 | // select the nuclear structure functions. | |
421 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
422 | // =1: internal PYTHIA acording to MSTP(51) | |
423 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
424 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. | |
425 | // MSTP(192) : Mass number of nucleus side 1 | |
426 | // MSTP(193) : Mass number of nucleus side 2 | |
427 | SetMSTP(52,2); | |
428 | SetMSTP(192, a1); | |
429 | SetMSTP(193, a2); | |
430 | } | |
431 | ||
432 | ||
433 | AliPythia* AliPythia::Instance() | |
434 | { | |
435 | // Set random number generator | |
436 | if (fgAliPythia) { | |
437 | return fgAliPythia; | |
438 | } else { | |
439 | fgAliPythia = new AliPythia(); | |
440 | return fgAliPythia; | |
441 | } | |
442 | } | |
443 | ||
444 | void AliPythia::PrintParticles() | |
445 | { | |
446 | // Print list of particl properties | |
447 | Int_t np = 0; | |
448 | ||
449 | for (Int_t kf=0; kf<1000000; kf++) { | |
450 | for (Int_t c = 1; c > -2; c-=2) { | |
451 | ||
452 | Int_t kc = Pycomp(c*kf); | |
453 | if (kc) { | |
454 | Float_t mass = GetPMAS(kc,1); | |
455 | Float_t width = GetPMAS(kc,2); | |
456 | Float_t tau = GetPMAS(kc,4); | |
457 | ||
458 | char* name = new char[8]; | |
459 | Pyname(kf,name); | |
460 | ||
461 | np++; | |
462 | ||
463 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
464 | c*kf, name, mass, width, tau); | |
465 | } | |
466 | } | |
467 | } | |
468 | printf("\n Number of particles %d \n \n", np); | |
469 | } | |
470 | ||
471 | void AliPythia::ResetDecayTable() | |
472 | { | |
473 | // Set default values for pythia decay switches | |
474 | Int_t i; | |
475 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
476 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
477 | } | |
478 | ||
479 | void AliPythia::SetDecayTable() | |
480 | { | |
481 | // Set default values for pythia decay switches | |
482 | // | |
483 | Int_t i; | |
484 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
485 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
486 | } | |
487 | ||
488 | void AliPythia::Pyclus(Int_t& njet) | |
489 | { | |
490 | // Call Pythia clustering algorithm | |
491 | // | |
492 | pyclus(njet); | |
493 | } | |
494 | ||
495 | void AliPythia::Pycell(Int_t& njet) | |
496 | { | |
497 | // Call Pythia jet reconstruction algorithm | |
498 | // | |
499 | pycell(njet); | |
500 | } | |
501 | ||
502 | ||
503 |