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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 | ||
16 | /* | |
17 | $Log$ | |
18 | Revision 1.28 2002/12/09 08:22:56 morsch | |
19 | UA1 jet finder (Pycell) for software triggering added. | |
20 | ||
21 | Revision 1.27 2002/11/15 00:39:37 morsch | |
22 | - Correct initialisation of sRandom. | |
23 | - QCD Jets with initial and final state gluon radiation is default | |
24 | - pt kick for jets default | |
25 | - Interface to Pyclus added. | |
26 | ||
27 | Revision 1.26 2002/11/14 00:37:32 morsch | |
28 | Warning message for kPyJets added. | |
29 | ||
30 | Revision 1.25 2002/10/14 14:55:35 hristov | |
31 | Merging the VirtualMC branch to the main development branch (HEAD) | |
32 | ||
33 | Revision 1.20.6.1 2002/06/10 14:57:41 hristov | |
34 | Merged with v3-08-02 | |
35 | ||
36 | Revision 1.24 2002/05/22 13:22:53 morsch | |
37 | Process kPyMbNonDiffr added. | |
38 | ||
39 | Revision 1.23 2002/05/06 07:17:29 morsch | |
40 | Pyr gives random number r in interval 0 < r < 1. | |
41 | ||
42 | Revision 1.22 2002/04/26 10:28:48 morsch | |
43 | Option kPyBeautyPbMNR added (N. Carrer). | |
44 | ||
45 | Revision 1.21 2002/03/25 14:46:16 morsch | |
46 | Case kPyD0PbMNR added (N. Carrer). | |
47 | ||
48 | Revision 1.20 2002/03/03 13:48:50 morsch | |
49 | Option kPyCharmPbMNR added. Produce charm pairs in agreement with MNR | |
50 | NLO calculations (Nicola Carrer). | |
51 | ||
52 | Revision 1.19 2002/02/20 08:52:20 morsch | |
53 | Correct documentation of SetNuclei method. | |
54 | ||
55 | Revision 1.18 2002/02/07 10:43:06 morsch | |
56 | Tuned pp-min.bias settings (M.Monteno, R.Ugoccioni and N.Carrer) | |
57 | ||
58 | Revision 1.17 2001/12/19 15:40:43 morsch | |
59 | For kPyJets enforce simple jet topology, i.e no initial or final state | |
60 | gluon radiation and no primordial pT. | |
61 | ||
62 | Revision 1.16 2001/10/12 11:13:59 morsch | |
63 | Missing break statements added (thanks to Nicola Carrer) | |
64 | ||
65 | Revision 1.15 2001/03/27 10:54:50 morsch | |
66 | Add ResetDecayTable() and SsetDecayTable() methods. | |
67 | ||
68 | Revision 1.14 2001/03/09 13:03:40 morsch | |
69 | Process_t and Struc_Func_t moved to AliPythia.h | |
70 | ||
71 | Revision 1.13 2000/12/18 08:55:35 morsch | |
72 | Make AliPythia dependent generartors work with new scheme of random number generation | |
73 | ||
74 | Revision 1.12 2000/11/30 07:12:50 alibrary | |
75 | Introducing new Rndm and QA classes | |
76 | ||
77 | Revision 1.11 2000/10/20 06:30:06 fca | |
78 | Use version 0 to avoid streamer generation | |
79 | ||
80 | Revision 1.10 2000/10/06 14:18:44 morsch | |
81 | Upper cut of prim. pT distribution set to 5. GeV | |
82 | ||
83 | Revision 1.9 2000/09/18 10:41:35 morsch | |
84 | Add possibility to use nuclear structure functions from PDF library V8. | |
85 | ||
86 | Revision 1.8 2000/09/06 14:26:24 morsch | |
87 | Decayer functionality of AliPythia has been moved to AliDecayerPythia. | |
88 | Class is now a singleton. | |
89 | ||
90 | Revision 1.7 2000/06/09 20:34:50 morsch | |
91 | All coding rule violations except RS3 corrected | |
92 | ||
93 | Revision 1.6 1999/11/09 07:38:48 fca | |
94 | Changes for compatibility with version 2.23 of ROOT | |
95 | ||
96 | Revision 1.5 1999/11/03 17:43:20 fca | |
97 | New version from G.Martinez & A.Morsch | |
98 | ||
99 | Revision 1.4 1999/09/29 09:24:14 fca | |
100 | Introduction of the Copyright and cvs Log | |
101 | ||
102 | */ | |
103 | ||
104 | ||
105 | #include "AliPythia.h" | |
106 | ||
107 | ClassImp(AliPythia) | |
108 | ||
109 | #ifndef WIN32 | |
110 | # define pyclus pyclus_ | |
111 | # define pycell pycell_ | |
112 | # define type_of_call | |
113 | #else | |
114 | # define pyclus PYCLUS | |
115 | # define pycell PYCELL | |
116 | # define type_of_call _stdcall | |
117 | #endif | |
118 | ||
119 | extern "C" void type_of_call pyclus(Int_t & ); | |
120 | extern "C" void type_of_call pycell(Int_t & ); | |
121 | ||
122 | //_____________________________________________________________________________ | |
123 | ||
124 | AliPythia* AliPythia::fgAliPythia=NULL; | |
125 | ||
126 | AliPythia::AliPythia() | |
127 | { | |
128 | // Default Constructor | |
129 | // | |
130 | // Set random number | |
131 | if (!sRandom) sRandom=fRandom; | |
132 | ||
133 | } | |
134 | ||
135 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) | |
136 | { | |
137 | // Initialise the process to generate | |
138 | if (!sRandom) sRandom = gRandom; | |
139 | ||
140 | fProcess = process; | |
141 | fEcms = energy; | |
142 | fStrucFunc = strucfunc; | |
143 | // don't decay p0 | |
144 | SetMDCY(Pycomp(111),1,0); | |
145 | // select structure function | |
146 | SetMSTP(52,2); | |
147 | SetMSTP(51,strucfunc); | |
148 | // | |
149 | // Pythia initialisation for selected processes// | |
150 | // | |
151 | // Make MSEL clean | |
152 | // | |
153 | for (Int_t i=1; i<= 200; i++) { | |
154 | SetMSUB(i,0); | |
155 | } | |
156 | // select charm production | |
157 | switch (process) | |
158 | { | |
159 | case kPyCharm: | |
160 | SetMSEL(4); | |
161 | // | |
162 | // heavy quark masses | |
163 | ||
164 | SetPMAS(4,1,1.2); | |
165 | SetMSTU(16,2); | |
166 | // | |
167 | // primordial pT | |
168 | SetMSTP(91,1); | |
169 | SetPARP(91,1.); | |
170 | SetPARP(93,5.); | |
171 | // | |
172 | break; | |
173 | case kPyBeauty: | |
174 | SetMSEL(5); | |
175 | SetPMAS(5,1,4.75); | |
176 | SetMSTU(16,2); | |
177 | break; | |
178 | case kPyJpsi: | |
179 | SetMSEL(0); | |
180 | // gg->J/Psi g | |
181 | SetMSUB(86,1); | |
182 | break; | |
183 | case kPyJpsiChi: | |
184 | SetMSEL(0); | |
185 | // gg->J/Psi g | |
186 | SetMSUB(86,1); | |
187 | // gg-> chi_0c g | |
188 | SetMSUB(87,1); | |
189 | // gg-> chi_1c g | |
190 | SetMSUB(88,1); | |
191 | // gg-> chi_2c g | |
192 | SetMSUB(89,1); | |
193 | break; | |
194 | case kPyCharmUnforced: | |
195 | SetMSEL(0); | |
196 | // gq->qg | |
197 | SetMSUB(28,1); | |
198 | // gg->qq | |
199 | SetMSUB(53,1); | |
200 | // gg->gg | |
201 | SetMSUB(68,1); | |
202 | break; | |
203 | case kPyBeautyUnforced: | |
204 | SetMSEL(0); | |
205 | // gq->qg | |
206 | SetMSUB(28,1); | |
207 | // gg->qq | |
208 | SetMSUB(53,1); | |
209 | // gg->gg | |
210 | SetMSUB(68,1); | |
211 | break; | |
212 | case kPyMb: | |
213 | // Minimum Bias pp-Collisions | |
214 | // | |
215 | // | |
216 | // select Pythia min. bias model | |
217 | SetMSEL(0); | |
218 | SetMSUB(92,1); // single diffraction AB-->XB | |
219 | SetMSUB(93,1); // single diffraction AB-->AX | |
220 | SetMSUB(94,1); // double diffraction | |
221 | SetMSUB(95,1); // low pt production | |
222 | SetMSTP(81,1); // multiple interactions switched on | |
223 | SetMSTP(82,3); // model with varying impact param. & a single Gaussian | |
224 | SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of | |
225 | // multiple interaction at a reference energy = 14000 GeV | |
226 | SetPARP(89,14000.); // reference energy for the above parameter | |
227 | SetPARP(90,0.174); // set exponent for energy dependence of pT_0 | |
228 | case kPyMbNonDiffr: | |
229 | // Minimum Bias pp-Collisions | |
230 | // | |
231 | // | |
232 | // select Pythia min. bias model | |
233 | SetMSEL(0); | |
234 | SetMSUB(95,1); // low pt production | |
235 | SetMSTP(81,1); // multiple interactions switched on | |
236 | SetMSTP(82,3); // model with varying impact param. & a single Gaussian | |
237 | SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of | |
238 | // multiple interaction at a reference energy = 14000 GeV | |
239 | SetPARP(89,14000.); // reference energy for the above parameter | |
240 | SetPARP(90,0.174); // set exponent for energy dependence of pT_0 | |
241 | ||
242 | break; | |
243 | case kPyJets: | |
244 | // | |
245 | // QCD Jets | |
246 | // | |
247 | SetMSEL(1); | |
248 | break; | |
249 | case kPyDirectGamma: | |
250 | SetMSEL(10); | |
251 | break; | |
252 | case kPyCharmPbMNR: | |
253 | case kPyD0PbMNR: | |
254 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
255 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
256 | // c-cbar single inclusive and double differential distributions. | |
257 | // This parameter settings are meant to work with Pb-Pb collisions | |
258 | // (AliGenPythia::SetNuclei) and with kCTEQ_4L PDFs. | |
259 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
260 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
261 | ||
262 | // All QCD processes | |
263 | SetMSEL(1); | |
264 | ||
265 | // No multiple interactions | |
266 | SetMSTP(81,0); | |
267 | SetPARP(81,0.0); | |
268 | SetPARP(82,0.0); | |
269 | ||
270 | // Initial/final parton shower on (Pythia default) | |
271 | SetMSTP(61,1); | |
272 | SetMSTP(71,1); | |
273 | ||
274 | // 2nd order alpha_s | |
275 | SetMSTP(2,2); | |
276 | ||
277 | // QCD scales | |
278 | SetMSTP(32,2); | |
279 | SetPARP(34,1.0); | |
280 | ||
281 | // Intrinsic <kT^2> | |
282 | SetMSTP(91,1); | |
283 | SetPARP(91,1.304); | |
284 | SetPARP(93,6.52); | |
285 | ||
286 | // Set c-quark mass | |
287 | SetPMAS(4,1,1.2); | |
288 | ||
289 | break; | |
290 | case kPyBeautyPbMNR: | |
291 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
292 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
293 | // b-bbar single inclusive and double differential distributions. | |
294 | // This parameter settings are meant to work with Pb-Pb collisions | |
295 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
296 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
297 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
298 | ||
299 | // All QCD processes | |
300 | SetMSEL(1); | |
301 | ||
302 | // No multiple interactions | |
303 | SetMSTP(81,0); | |
304 | SetPARP(81,0.0); | |
305 | SetPARP(82,0.0); | |
306 | ||
307 | // Initial/final parton shower on (Pythia default) | |
308 | SetMSTP(61,1); | |
309 | SetMSTP(71,1); | |
310 | ||
311 | // 2nd order alpha_s | |
312 | SetMSTP(2,2); | |
313 | ||
314 | // QCD scales | |
315 | SetMSTP(32,2); | |
316 | SetPARP(34,1.0); | |
317 | SetPARP(67,1.0); | |
318 | SetPARP(71,1.0); | |
319 | ||
320 | // Intrinsic <kT^2> | |
321 | SetMSTP(91,1); | |
322 | SetPARP(91,2.035); | |
323 | SetPARP(93,10.17); | |
324 | ||
325 | // Set b-quark mass | |
326 | SetPMAS(5,1,4.75); | |
327 | ||
328 | break; | |
329 | } | |
330 | // | |
331 | // Initialize PYTHIA | |
332 | SetMSTP(41,1); // all resonance decays switched on | |
333 | ||
334 | Initialize("CMS","p","p",fEcms); | |
335 | ||
336 | } | |
337 | ||
338 | Int_t AliPythia::CheckedLuComp(Int_t kf) | |
339 | { | |
340 | // Check Lund particle code (for debugging) | |
341 | Int_t kc=Pycomp(kf); | |
342 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
343 | return kc; | |
344 | } | |
345 | ||
346 | void AliPythia::SetNuclei(Int_t a1, Int_t a2) | |
347 | { | |
348 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
349 | // The MSTP array in the PYPARS common block is used to enable and | |
350 | // select the nuclear structure functions. | |
351 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
352 | // =1: internal PYTHIA acording to MSTP(51) | |
353 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
354 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. | |
355 | // MSTP(192) : Mass number of nucleus side 1 | |
356 | // MSTP(193) : Mass number of nucleus side 2 | |
357 | SetMSTP(52,2); | |
358 | SetMSTP(192, a1); | |
359 | SetMSTP(193, a2); | |
360 | } | |
361 | ||
362 | ||
363 | AliPythia* AliPythia::Instance() | |
364 | { | |
365 | // Set random number generator | |
366 | if (fgAliPythia) { | |
367 | return fgAliPythia; | |
368 | } else { | |
369 | fgAliPythia = new AliPythia(); | |
370 | return fgAliPythia; | |
371 | } | |
372 | } | |
373 | ||
374 | void AliPythia::PrintParticles() | |
375 | { | |
376 | // Print list of particl properties | |
377 | Int_t np = 0; | |
378 | ||
379 | for (Int_t kf=0; kf<1000000; kf++) { | |
380 | for (Int_t c = 1; c > -2; c-=2) { | |
381 | ||
382 | Int_t kc = Pycomp(c*kf); | |
383 | if (kc) { | |
384 | Float_t mass = GetPMAS(kc,1); | |
385 | Float_t width = GetPMAS(kc,2); | |
386 | Float_t tau = GetPMAS(kc,4); | |
387 | ||
388 | char* name = new char[8]; | |
389 | Pyname(kf,name); | |
390 | ||
391 | np++; | |
392 | ||
393 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
394 | c*kf, name, mass, width, tau); | |
395 | } | |
396 | } | |
397 | } | |
398 | printf("\n Number of particles %d \n \n", np); | |
399 | } | |
400 | ||
401 | void AliPythia::ResetDecayTable() | |
402 | { | |
403 | // Set default values for pythia decay switches | |
404 | Int_t i; | |
405 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
406 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
407 | } | |
408 | ||
409 | void AliPythia::SetDecayTable() | |
410 | { | |
411 | // Set default values for pythia decay switches | |
412 | // | |
413 | Int_t i; | |
414 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
415 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
416 | } | |
417 | ||
418 | void AliPythia::Pyclus(Int_t& njet) | |
419 | { | |
420 | // Call Pythia clustering algorithm | |
421 | // | |
422 | pyclus(njet); | |
423 | } | |
424 | ||
425 | void AliPythia::Pycell(Int_t& njet) | |
426 | { | |
427 | // Call Pythia jet reconstruction algorithm | |
428 | // | |
429 | pycell(njet); | |
430 | } | |
431 | ||
432 | ||
433 | ||
434 | #ifndef WIN32 | |
435 | #define pyr pyr_ | |
436 | #define pyrset pyrset_ | |
437 | #define pyrget pyrget_ | |
438 | #define pyclus pyclus_ | |
439 | #define pycell pycell_ | |
440 | #else | |
441 | #define pyr PYR | |
442 | #define pyrset PYRSET | |
443 | #define pyrget PYRGET | |
444 | #define pyclus PYCLUS | |
445 | #define pycell PYCELL | |
446 | #endif | |
447 | ||
448 | extern "C" { | |
449 | Double_t pyr(Int_t*) | |
450 | { | |
451 | Float_t r; | |
452 | do r=sRandom->Rndm(); while(0 >= r || r >= 1); | |
453 | return r; | |
454 | } | |
455 | void pyrset(Int_t*,Int_t*) {} | |
456 | void pyrget(Int_t*,Int_t*) {} | |
457 | } | |
458 | ||
459 | ||
460 | ||
461 | ||
462 |