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