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4c039060 | 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 | $Log$ | |
4af58cc6 | 18 | Revision 1.27 2002/11/15 00:39:37 morsch |
19 | - Correct initialisation of sRandom. | |
20 | - QCD Jets with initial and final state gluon radiation is default | |
21 | - pt kick for jets default | |
22 | - Interface to Pyclus added. | |
23 | ||
47285bde | 24 | Revision 1.26 2002/11/14 00:37:32 morsch |
25 | Warning message for kPyJets added. | |
26 | ||
b8146af6 | 27 | Revision 1.25 2002/10/14 14:55:35 hristov |
28 | Merging the VirtualMC branch to the main development branch (HEAD) | |
29 | ||
b9d0a01d | 30 | Revision 1.20.6.1 2002/06/10 14:57:41 hristov |
31 | Merged with v3-08-02 | |
32 | ||
33 | Revision 1.24 2002/05/22 13:22:53 morsch | |
34 | Process kPyMbNonDiffr added. | |
35 | ||
5f42cc16 | 36 | Revision 1.23 2002/05/06 07:17:29 morsch |
37 | Pyr gives random number r in interval 0 < r < 1. | |
38 | ||
794201ba | 39 | Revision 1.22 2002/04/26 10:28:48 morsch |
40 | Option kPyBeautyPbMNR added (N. Carrer). | |
41 | ||
876d7f60 | 42 | Revision 1.21 2002/03/25 14:46:16 morsch |
43 | Case kPyD0PbMNR added (N. Carrer). | |
44 | ||
b0e7c3be | 45 | Revision 1.20 2002/03/03 13:48:50 morsch |
46 | Option kPyCharmPbMNR added. Produce charm pairs in agreement with MNR | |
47 | NLO calculations (Nicola Carrer). | |
48 | ||
fbd1348b | 49 | Revision 1.19 2002/02/20 08:52:20 morsch |
50 | Correct documentation of SetNuclei method. | |
51 | ||
bdc9d08a | 52 | Revision 1.18 2002/02/07 10:43:06 morsch |
53 | Tuned pp-min.bias settings (M.Monteno, R.Ugoccioni and N.Carrer) | |
54 | ||
2afdd95f | 55 | Revision 1.17 2001/12/19 15:40:43 morsch |
56 | For kPyJets enforce simple jet topology, i.e no initial or final state | |
57 | gluon radiation and no primordial pT. | |
58 | ||
5ceb826f | 59 | Revision 1.16 2001/10/12 11:13:59 morsch |
60 | Missing break statements added (thanks to Nicola Carrer) | |
61 | ||
02c16581 | 62 | Revision 1.15 2001/03/27 10:54:50 morsch |
63 | Add ResetDecayTable() and SsetDecayTable() methods. | |
64 | ||
14ee1cd0 | 65 | Revision 1.14 2001/03/09 13:03:40 morsch |
66 | Process_t and Struc_Func_t moved to AliPythia.h | |
67 | ||
f1a48a38 | 68 | Revision 1.13 2000/12/18 08:55:35 morsch |
69 | Make AliPythia dependent generartors work with new scheme of random number generation | |
70 | ||
3356c022 | 71 | Revision 1.12 2000/11/30 07:12:50 alibrary |
72 | Introducing new Rndm and QA classes | |
73 | ||
65fb704d | 74 | Revision 1.11 2000/10/20 06:30:06 fca |
75 | Use version 0 to avoid streamer generation | |
76 | ||
3be3dfc7 | 77 | Revision 1.10 2000/10/06 14:18:44 morsch |
78 | Upper cut of prim. pT distribution set to 5. GeV | |
79 | ||
e8d05e6c | 80 | Revision 1.9 2000/09/18 10:41:35 morsch |
81 | Add possibility to use nuclear structure functions from PDF library V8. | |
82 | ||
811826d8 | 83 | Revision 1.8 2000/09/06 14:26:24 morsch |
84 | Decayer functionality of AliPythia has been moved to AliDecayerPythia. | |
85 | Class is now a singleton. | |
86 | ||
95b811fe | 87 | Revision 1.7 2000/06/09 20:34:50 morsch |
88 | All coding rule violations except RS3 corrected | |
89 | ||
f87cfe57 | 90 | Revision 1.6 1999/11/09 07:38:48 fca |
91 | Changes for compatibility with version 2.23 of ROOT | |
92 | ||
084c1b4a | 93 | Revision 1.5 1999/11/03 17:43:20 fca |
94 | New version from G.Martinez & A.Morsch | |
95 | ||
886b6f73 | 96 | Revision 1.4 1999/09/29 09:24:14 fca |
97 | Introduction of the Copyright and cvs Log | |
98 | ||
4c039060 | 99 | */ |
100 | ||
75c6d54e | 101 | |
fe4da5cc | 102 | #include "AliPythia.h" |
f87cfe57 | 103 | |
fe4da5cc | 104 | ClassImp(AliPythia) |
105 | ||
47285bde | 106 | #ifndef WIN32 |
107 | # define pyclus pyclus_ | |
4af58cc6 | 108 | # define pycell pycell_ |
47285bde | 109 | # define type_of_call |
110 | #else | |
111 | # define pyclus PYCLUS | |
4af58cc6 | 112 | # define pycell PYCELL |
47285bde | 113 | # define type_of_call _stdcall |
114 | #endif | |
115 | ||
116 | extern "C" void type_of_call pyclus(Int_t & ); | |
4af58cc6 | 117 | extern "C" void type_of_call pycell(Int_t & ); |
47285bde | 118 | |
fe4da5cc | 119 | //_____________________________________________________________________________ |
120 | ||
95b811fe | 121 | AliPythia* AliPythia::fgAliPythia=NULL; |
fe4da5cc | 122 | |
75c6d54e | 123 | AliPythia::AliPythia() |
124 | { | |
95b811fe | 125 | // Default Constructor |
3356c022 | 126 | // |
127 | // Set random number | |
128 | if (!sRandom) sRandom=fRandom; | |
14ee1cd0 | 129 | |
fe4da5cc | 130 | } |
131 | ||
132 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) | |
133 | { | |
f87cfe57 | 134 | // Initialise the process to generate |
47285bde | 135 | if (!sRandom) sRandom = gRandom; |
136 | ||
fe4da5cc | 137 | fProcess = process; |
138 | fEcms = energy; | |
139 | fStrucFunc = strucfunc; | |
140 | // don't decay p0 | |
95b811fe | 141 | SetMDCY(Pycomp(111),1,0); |
fe4da5cc | 142 | // select structure function |
143 | SetMSTP(52,2); | |
144 | SetMSTP(51,strucfunc); | |
145 | // | |
146 | // Pythia initialisation for selected processes// | |
147 | // | |
148 | // Make MSEL clean | |
149 | // | |
150 | for (Int_t i=1; i<= 200; i++) { | |
151 | SetMSUB(i,0); | |
152 | } | |
153 | // select charm production | |
154 | switch (process) | |
155 | { | |
f1a48a38 | 156 | case kPyCharm: |
fe4da5cc | 157 | SetMSEL(4); |
158 | // | |
159 | // heavy quark masses | |
160 | ||
161 | SetPMAS(4,1,1.2); | |
5ceb826f | 162 | SetMSTU(16,2); |
fe4da5cc | 163 | // |
164 | // primordial pT | |
165 | SetMSTP(91,1); | |
e8d05e6c | 166 | SetPARP(91,1.); |
167 | SetPARP(93,5.); | |
fe4da5cc | 168 | // |
169 | break; | |
f1a48a38 | 170 | case kPyBeauty: |
fe4da5cc | 171 | SetMSEL(5); |
172 | SetPMAS(5,1,4.75); | |
5ceb826f | 173 | SetMSTU(16,2); |
fe4da5cc | 174 | break; |
f1a48a38 | 175 | case kPyJpsi: |
fe4da5cc | 176 | SetMSEL(0); |
177 | // gg->J/Psi g | |
178 | SetMSUB(86,1); | |
179 | break; | |
f1a48a38 | 180 | case kPyJpsiChi: |
fe4da5cc | 181 | SetMSEL(0); |
182 | // gg->J/Psi g | |
183 | SetMSUB(86,1); | |
184 | // gg-> chi_0c g | |
185 | SetMSUB(87,1); | |
186 | // gg-> chi_1c g | |
187 | SetMSUB(88,1); | |
188 | // gg-> chi_2c g | |
189 | SetMSUB(89,1); | |
02c16581 | 190 | break; |
f1a48a38 | 191 | case kPyCharmUnforced: |
fe4da5cc | 192 | SetMSEL(0); |
193 | // gq->qg | |
194 | SetMSUB(28,1); | |
195 | // gg->qq | |
196 | SetMSUB(53,1); | |
197 | // gg->gg | |
198 | SetMSUB(68,1); | |
02c16581 | 199 | break; |
f1a48a38 | 200 | case kPyBeautyUnforced: |
fe4da5cc | 201 | SetMSEL(0); |
202 | // gq->qg | |
203 | SetMSUB(28,1); | |
204 | // gg->qq | |
205 | SetMSUB(53,1); | |
206 | // gg->gg | |
207 | SetMSUB(68,1); | |
208 | break; | |
f1a48a38 | 209 | case kPyMb: |
75c6d54e | 210 | // Minimum Bias pp-Collisions |
211 | // | |
75c6d54e | 212 | // |
213 | // select Pythia min. bias model | |
14ee1cd0 | 214 | SetMSEL(0); |
2afdd95f | 215 | SetMSUB(92,1); // single diffraction AB-->XB |
216 | SetMSUB(93,1); // single diffraction AB-->AX | |
217 | SetMSUB(94,1); // double diffraction | |
218 | SetMSUB(95,1); // low pt production | |
219 | SetMSTP(81,1); // multiple interactions switched on | |
220 | SetMSTP(82,3); // model with varying impact param. & a single Gaussian | |
221 | SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of | |
222 | // multiple interaction at a reference energy = 14000 GeV | |
223 | SetPARP(89,14000.); // reference energy for the above parameter | |
5f42cc16 | 224 | SetPARP(90,0.174); // set exponent for energy dependence of pT_0 |
225 | case kPyMbNonDiffr: | |
226 | // Minimum Bias pp-Collisions | |
227 | // | |
228 | // | |
229 | // select Pythia min. bias model | |
230 | SetMSEL(0); | |
231 | SetMSUB(95,1); // low pt production | |
232 | SetMSTP(81,1); // multiple interactions switched on | |
233 | SetMSTP(82,3); // model with varying impact param. & a single Gaussian | |
234 | SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of | |
235 | // multiple interaction at a reference energy = 14000 GeV | |
236 | SetPARP(89,14000.); // reference energy for the above parameter | |
237 | SetPARP(90,0.174); // set exponent for energy dependence of pT_0 | |
238 | ||
f1a48a38 | 239 | break; |
240 | case kPyJets: | |
b8146af6 | 241 | // |
47285bde | 242 | // QCD Jets |
b8146af6 | 243 | // |
f1a48a38 | 244 | SetMSEL(1); |
245 | break; | |
246 | case kPyDirectGamma: | |
247 | SetMSEL(10); | |
248 | break; | |
fbd1348b | 249 | case kPyCharmPbMNR: |
b0e7c3be | 250 | case kPyD0PbMNR: |
fbd1348b | 251 | // Tuning of Pythia parameters aimed to get a resonable agreement |
252 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
253 | // c-cbar single inclusive and double differential distributions. | |
254 | // This parameter settings are meant to work with Pb-Pb collisions | |
255 | // (AliGenPythia::SetNuclei) and with kCTEQ_4L PDFs. | |
256 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
257 | // has to be set to 2.1GeV. Example in ConfigCharmPPR.C. | |
258 | ||
259 | // All QCD processes | |
260 | SetMSEL(1); | |
261 | ||
262 | // No multiple interactions | |
263 | SetMSTP(81,0); | |
264 | SetPARP(81,0.0); | |
265 | SetPARP(82,0.0); | |
266 | ||
267 | // Initial/final parton shower on (Pythia default) | |
268 | SetMSTP(61,1); | |
269 | SetMSTP(71,1); | |
270 | ||
271 | // 2nd order alpha_s | |
272 | SetMSTP(2,2); | |
273 | ||
274 | // QCD scales | |
275 | SetMSTP(32,2); | |
276 | SetPARP(34,1.0); | |
277 | ||
278 | // Intrinsic <kT^2> | |
279 | SetMSTP(91,1); | |
280 | SetPARP(91,1.304); | |
281 | SetPARP(93,6.52); | |
282 | ||
283 | // Set c-quark mass | |
284 | SetPMAS(4,1,1.2); | |
285 | ||
876d7f60 | 286 | break; |
287 | case kPyBeautyPbMNR: | |
288 | // Tuning of Pythia parameters aimed to get a resonable agreement | |
289 | // between with the NLO calculation by Mangano, Nason, Ridolfi for the | |
290 | // b-bbar single inclusive and double differential distributions. | |
291 | // This parameter settings are meant to work with Pb-Pb collisions | |
292 | // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs. | |
293 | // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard) | |
294 | // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C. | |
295 | ||
296 | // All QCD processes | |
297 | SetMSEL(1); | |
298 | ||
299 | // No multiple interactions | |
300 | SetMSTP(81,0); | |
301 | SetPARP(81,0.0); | |
302 | SetPARP(82,0.0); | |
303 | ||
304 | // Initial/final parton shower on (Pythia default) | |
305 | SetMSTP(61,1); | |
306 | SetMSTP(71,1); | |
307 | ||
308 | // 2nd order alpha_s | |
309 | SetMSTP(2,2); | |
310 | ||
311 | // QCD scales | |
312 | SetMSTP(32,2); | |
313 | SetPARP(34,1.0); | |
314 | SetPARP(67,1.0); | |
315 | SetPARP(71,1.0); | |
316 | ||
317 | // Intrinsic <kT^2> | |
318 | SetMSTP(91,1); | |
319 | SetPARP(91,2.035); | |
320 | SetPARP(93,10.17); | |
321 | ||
322 | // Set b-quark mass | |
323 | SetPMAS(5,1,4.75); | |
324 | ||
fbd1348b | 325 | break; |
fe4da5cc | 326 | } |
327 | // | |
328 | // Initialize PYTHIA | |
2afdd95f | 329 | SetMSTP(41,1); // all resonance decays switched on |
75c6d54e | 330 | |
95b811fe | 331 | Initialize("CMS","p","p",fEcms); |
14ee1cd0 | 332 | |
fe4da5cc | 333 | } |
334 | ||
95b811fe | 335 | Int_t AliPythia::CheckedLuComp(Int_t kf) |
fe4da5cc | 336 | { |
95b811fe | 337 | // Check Lund particle code (for debugging) |
338 | Int_t kc=Pycomp(kf); | |
339 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
340 | return kc; | |
fe4da5cc | 341 | } |
342 | ||
811826d8 | 343 | void AliPythia::SetNuclei(Int_t a1, Int_t a2) |
344 | { | |
345 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
346 | // The MSTP array in the PYPARS common block is used to enable and | |
347 | // select the nuclear structure functions. | |
348 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
349 | // =1: internal PYTHIA acording to MSTP(51) | |
350 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
bdc9d08a | 351 | // If the following mass number both not equal zero, nuclear corrections of the stf are used. |
811826d8 | 352 | // MSTP(192) : Mass number of nucleus side 1 |
353 | // MSTP(193) : Mass number of nucleus side 2 | |
bdc9d08a | 354 | SetMSTP(52,2); |
811826d8 | 355 | SetMSTP(192, a1); |
356 | SetMSTP(193, a2); | |
357 | } | |
358 | ||
359 | ||
95b811fe | 360 | AliPythia* AliPythia::Instance() |
3356c022 | 361 | { |
362 | // Set random number generator | |
95b811fe | 363 | if (fgAliPythia) { |
364 | return fgAliPythia; | |
365 | } else { | |
366 | fgAliPythia = new AliPythia(); | |
367 | return fgAliPythia; | |
fe4da5cc | 368 | } |
fe4da5cc | 369 | } |
fe4da5cc | 370 | |
14ee1cd0 | 371 | void AliPythia::PrintParticles() |
372 | { | |
373 | // Print list of particl properties | |
374 | Int_t np = 0; | |
375 | ||
376 | for (Int_t kf=0; kf<1000000; kf++) { | |
377 | for (Int_t c = 1; c > -2; c-=2) { | |
378 | ||
379 | Int_t kc = Pycomp(c*kf); | |
380 | if (kc) { | |
381 | Float_t mass = GetPMAS(kc,1); | |
382 | Float_t width = GetPMAS(kc,2); | |
383 | Float_t tau = GetPMAS(kc,4); | |
384 | ||
385 | char* name = new char[8]; | |
386 | Pyname(kf,name); | |
387 | ||
388 | np++; | |
389 | ||
390 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
391 | c*kf, name, mass, width, tau); | |
392 | } | |
393 | } | |
394 | } | |
395 | printf("\n Number of particles %d \n \n", np); | |
396 | } | |
397 | ||
398 | void AliPythia::ResetDecayTable() | |
399 | { | |
400 | // Set default values for pythia decay switches | |
401 | Int_t i; | |
402 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
403 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
404 | } | |
405 | ||
406 | void AliPythia::SetDecayTable() | |
407 | { | |
408 | // Set default values for pythia decay switches | |
409 | // | |
410 | Int_t i; | |
411 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
412 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
413 | } | |
fe4da5cc | 414 | |
47285bde | 415 | void AliPythia::Pyclus(Int_t& njet) |
416 | { | |
417 | // Call Pythia clustering algorithm | |
418 | // | |
419 | pyclus(njet); | |
420 | } | |
421 | ||
4af58cc6 | 422 | void AliPythia::Pycell(Int_t& njet) |
423 | { | |
424 | // Call Pythia jet reconstruction algorithm | |
425 | // | |
426 | pycell(njet); | |
427 | } | |
428 | ||
47285bde | 429 | |
fe4da5cc | 430 | |
3356c022 | 431 | #ifndef WIN32 |
432 | #define pyr pyr_ | |
433 | #define pyrset pyrset_ | |
434 | #define pyrget pyrget_ | |
47285bde | 435 | #define pyclus pyclus_ |
4af58cc6 | 436 | #define pycell pycell_ |
3356c022 | 437 | #else |
438 | #define pyr PYR | |
439 | #define pyrset PYRSET | |
440 | #define pyrget PYRGET | |
47285bde | 441 | #define pyclus PYCLUS |
4af58cc6 | 442 | #define pycell PYCELL |
3356c022 | 443 | #endif |
444 | ||
445 | extern "C" { | |
794201ba | 446 | Double_t pyr(Int_t*) |
447 | { | |
448 | Float_t r; | |
449 | do r=sRandom->Rndm(); while(0 >= r || r >= 1); | |
450 | return r; | |
451 | } | |
3356c022 | 452 | void pyrset(Int_t*,Int_t*) {} |
453 | void pyrget(Int_t*,Int_t*) {} | |
454 | } | |
455 | ||
fe4da5cc | 456 | |
457 | ||
458 | ||
47285bde | 459 |