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