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