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