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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 | $Log$ | |
14ee1cd0 | 18 | Revision 1.14 2001/03/09 13:03:40 morsch |
19 | Process_t and Struc_Func_t moved to AliPythia.h | |
20 | ||
f1a48a38 | 21 | Revision 1.13 2000/12/18 08:55:35 morsch |
22 | Make AliPythia dependent generartors work with new scheme of random number generation | |
23 | ||
3356c022 | 24 | Revision 1.12 2000/11/30 07:12:50 alibrary |
25 | Introducing new Rndm and QA classes | |
26 | ||
65fb704d | 27 | Revision 1.11 2000/10/20 06:30:06 fca |
28 | Use version 0 to avoid streamer generation | |
29 | ||
3be3dfc7 | 30 | Revision 1.10 2000/10/06 14:18:44 morsch |
31 | Upper cut of prim. pT distribution set to 5. GeV | |
32 | ||
e8d05e6c | 33 | Revision 1.9 2000/09/18 10:41:35 morsch |
34 | Add possibility to use nuclear structure functions from PDF library V8. | |
35 | ||
811826d8 | 36 | Revision 1.8 2000/09/06 14:26:24 morsch |
37 | Decayer functionality of AliPythia has been moved to AliDecayerPythia. | |
38 | Class is now a singleton. | |
39 | ||
95b811fe | 40 | Revision 1.7 2000/06/09 20:34:50 morsch |
41 | All coding rule violations except RS3 corrected | |
42 | ||
f87cfe57 | 43 | Revision 1.6 1999/11/09 07:38:48 fca |
44 | Changes for compatibility with version 2.23 of ROOT | |
45 | ||
084c1b4a | 46 | Revision 1.5 1999/11/03 17:43:20 fca |
47 | New version from G.Martinez & A.Morsch | |
48 | ||
886b6f73 | 49 | Revision 1.4 1999/09/29 09:24:14 fca |
50 | Introduction of the Copyright and cvs Log | |
51 | ||
4c039060 | 52 | */ |
53 | ||
75c6d54e | 54 | |
fe4da5cc | 55 | #include "AliPythia.h" |
f87cfe57 | 56 | |
fe4da5cc | 57 | ClassImp(AliPythia) |
58 | ||
fe4da5cc | 59 | //_____________________________________________________________________________ |
60 | ||
95b811fe | 61 | AliPythia* AliPythia::fgAliPythia=NULL; |
fe4da5cc | 62 | |
75c6d54e | 63 | AliPythia::AliPythia() |
64 | { | |
95b811fe | 65 | // Default Constructor |
3356c022 | 66 | // |
67 | // Set random number | |
68 | if (!sRandom) sRandom=fRandom; | |
14ee1cd0 | 69 | |
fe4da5cc | 70 | } |
71 | ||
72 | void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc) | |
73 | { | |
f87cfe57 | 74 | // Initialise the process to generate |
fe4da5cc | 75 | fProcess = process; |
76 | fEcms = energy; | |
77 | fStrucFunc = strucfunc; | |
78 | // don't decay p0 | |
95b811fe | 79 | SetMDCY(Pycomp(111),1,0); |
fe4da5cc | 80 | // select structure function |
81 | SetMSTP(52,2); | |
82 | SetMSTP(51,strucfunc); | |
83 | // | |
84 | // Pythia initialisation for selected processes// | |
85 | // | |
86 | // Make MSEL clean | |
87 | // | |
88 | for (Int_t i=1; i<= 200; i++) { | |
89 | SetMSUB(i,0); | |
90 | } | |
91 | // select charm production | |
92 | switch (process) | |
93 | { | |
f1a48a38 | 94 | case kPyCharm: |
fe4da5cc | 95 | SetMSEL(4); |
96 | // | |
97 | // heavy quark masses | |
98 | ||
99 | SetPMAS(4,1,1.2); | |
100 | ||
101 | // | |
102 | // primordial pT | |
103 | SetMSTP(91,1); | |
e8d05e6c | 104 | SetPARP(91,1.); |
105 | SetPARP(93,5.); | |
fe4da5cc | 106 | // |
107 | break; | |
f1a48a38 | 108 | case kPyBeauty: |
fe4da5cc | 109 | SetMSEL(5); |
110 | SetPMAS(5,1,4.75); | |
111 | break; | |
f1a48a38 | 112 | case kPyJpsi: |
fe4da5cc | 113 | SetMSEL(0); |
114 | // gg->J/Psi g | |
115 | SetMSUB(86,1); | |
116 | break; | |
f1a48a38 | 117 | case kPyJpsiChi: |
fe4da5cc | 118 | SetMSEL(0); |
119 | // gg->J/Psi g | |
120 | SetMSUB(86,1); | |
121 | // gg-> chi_0c g | |
122 | SetMSUB(87,1); | |
123 | // gg-> chi_1c g | |
124 | SetMSUB(88,1); | |
125 | // gg-> chi_2c g | |
126 | SetMSUB(89,1); | |
f1a48a38 | 127 | case kPyCharmUnforced: |
fe4da5cc | 128 | SetMSEL(0); |
129 | // gq->qg | |
130 | SetMSUB(28,1); | |
131 | // gg->qq | |
132 | SetMSUB(53,1); | |
133 | // gg->gg | |
134 | SetMSUB(68,1); | |
f1a48a38 | 135 | case kPyBeautyUnforced: |
fe4da5cc | 136 | SetMSEL(0); |
137 | // gq->qg | |
138 | SetMSUB(28,1); | |
139 | // gg->qq | |
140 | SetMSUB(53,1); | |
141 | // gg->gg | |
142 | SetMSUB(68,1); | |
143 | break; | |
f1a48a38 | 144 | case kPyMb: |
75c6d54e | 145 | // Minimum Bias pp-Collisions |
146 | // | |
147 | // Tuning of parameters descibed in G. Ciapetti and A. Di Ciaccio | |
148 | // Proc. of the LHC Workshop, Aachen 1990, Vol. II p. 155 | |
149 | // | |
150 | // select Pythia min. bias model | |
14ee1cd0 | 151 | SetMSEL(0); |
75c6d54e | 152 | SetMSUB(92,1); |
153 | SetMSUB(93,1); | |
154 | SetMSUB(94,1); | |
155 | SetMSUB(95,1); | |
156 | // Multiple interactions switched on | |
157 | SetMSTP(81,1); | |
158 | SetMSTP(82,1); | |
159 | // Low-pT cut-off for hard scattering | |
160 | SetPARP(81,1.9); | |
161 | // model for subsequent non-hardest interaction | |
162 | // 90% gg->gg 10% gg->qq | |
163 | SetPARP(86,0.9); | |
164 | // 90% of gluon interactions have minimum string length | |
165 | SetPARP(85,0.9); | |
f1a48a38 | 166 | break; |
167 | case kPyJets: | |
168 | SetMSEL(1); | |
169 | break; | |
170 | case kPyDirectGamma: | |
171 | SetMSEL(10); | |
172 | break; | |
fe4da5cc | 173 | } |
174 | // | |
175 | // Initialize PYTHIA | |
95b811fe | 176 | SetMSTP(41,1); |
75c6d54e | 177 | |
95b811fe | 178 | Initialize("CMS","p","p",fEcms); |
14ee1cd0 | 179 | |
fe4da5cc | 180 | } |
181 | ||
95b811fe | 182 | Int_t AliPythia::CheckedLuComp(Int_t kf) |
fe4da5cc | 183 | { |
95b811fe | 184 | // Check Lund particle code (for debugging) |
185 | Int_t kc=Pycomp(kf); | |
186 | printf("\n Lucomp kf,kc %d %d",kf,kc); | |
187 | return kc; | |
fe4da5cc | 188 | } |
189 | ||
811826d8 | 190 | void AliPythia::SetNuclei(Int_t a1, Int_t a2) |
191 | { | |
192 | // Treat protons as inside nuclei with mass numbers a1 and a2 | |
193 | // The MSTP array in the PYPARS common block is used to enable and | |
194 | // select the nuclear structure functions. | |
195 | // MSTP(52) : (D=1) choice of proton and nuclear structure-function library | |
196 | // =1: internal PYTHIA acording to MSTP(51) | |
197 | // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET | |
198 | // =3: PDFLIB proton s.f. with nuclar correction: | |
199 | // MSTP( 51) = 1000xNPGROUP+NPSET | |
200 | // MSTP(151) = 1000xNAGROUP+NASET | |
201 | // MSTP(192) : Mass number of nucleus side 1 | |
202 | // MSTP(193) : Mass number of nucleus side 2 | |
203 | ||
204 | SetMSTP(52,3); | |
205 | SetMSTP(191, 1001); | |
206 | SetMSTP(192, a1); | |
207 | SetMSTP(193, a2); | |
208 | } | |
209 | ||
210 | ||
95b811fe | 211 | AliPythia* AliPythia::Instance() |
3356c022 | 212 | { |
213 | // Set random number generator | |
95b811fe | 214 | if (fgAliPythia) { |
215 | return fgAliPythia; | |
216 | } else { | |
217 | fgAliPythia = new AliPythia(); | |
218 | return fgAliPythia; | |
fe4da5cc | 219 | } |
fe4da5cc | 220 | } |
fe4da5cc | 221 | |
14ee1cd0 | 222 | void AliPythia::PrintParticles() |
223 | { | |
224 | // Print list of particl properties | |
225 | Int_t np = 0; | |
226 | ||
227 | for (Int_t kf=0; kf<1000000; kf++) { | |
228 | for (Int_t c = 1; c > -2; c-=2) { | |
229 | ||
230 | Int_t kc = Pycomp(c*kf); | |
231 | if (kc) { | |
232 | Float_t mass = GetPMAS(kc,1); | |
233 | Float_t width = GetPMAS(kc,2); | |
234 | Float_t tau = GetPMAS(kc,4); | |
235 | ||
236 | char* name = new char[8]; | |
237 | Pyname(kf,name); | |
238 | ||
239 | np++; | |
240 | ||
241 | printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e", | |
242 | c*kf, name, mass, width, tau); | |
243 | } | |
244 | } | |
245 | } | |
246 | printf("\n Number of particles %d \n \n", np); | |
247 | } | |
248 | ||
249 | void AliPythia::ResetDecayTable() | |
250 | { | |
251 | // Set default values for pythia decay switches | |
252 | Int_t i; | |
253 | for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]); | |
254 | for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]); | |
255 | } | |
256 | ||
257 | void AliPythia::SetDecayTable() | |
258 | { | |
259 | // Set default values for pythia decay switches | |
260 | // | |
261 | Int_t i; | |
262 | for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1); | |
263 | for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1); | |
264 | } | |
fe4da5cc | 265 | |
266 | ||
3356c022 | 267 | #ifndef WIN32 |
268 | #define pyr pyr_ | |
269 | #define pyrset pyrset_ | |
270 | #define pyrget pyrget_ | |
271 | #else | |
272 | #define pyr PYR | |
273 | #define pyrset PYRSET | |
274 | #define pyrget PYRGET | |
275 | #endif | |
276 | ||
277 | extern "C" { | |
278 | Double_t pyr(Int_t*) {return sRandom->Rndm();} | |
279 | void pyrset(Int_t*,Int_t*) {} | |
280 | void pyrget(Int_t*,Int_t*) {} | |
281 | } | |
282 | ||
fe4da5cc | 283 | |
284 | ||
285 |