1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 Revision 1.17 2001/12/19 15:40:43 morsch
19 For kPyJets enforce simple jet topology, i.e no initial or final state
20 gluon radiation and no primordial pT.
22 Revision 1.16 2001/10/12 11:13:59 morsch
23 Missing break statements added (thanks to Nicola Carrer)
25 Revision 1.15 2001/03/27 10:54:50 morsch
26 Add ResetDecayTable() and SsetDecayTable() methods.
28 Revision 1.14 2001/03/09 13:03:40 morsch
29 Process_t and Struc_Func_t moved to AliPythia.h
31 Revision 1.13 2000/12/18 08:55:35 morsch
32 Make AliPythia dependent generartors work with new scheme of random number generation
34 Revision 1.12 2000/11/30 07:12:50 alibrary
35 Introducing new Rndm and QA classes
37 Revision 1.11 2000/10/20 06:30:06 fca
38 Use version 0 to avoid streamer generation
40 Revision 1.10 2000/10/06 14:18:44 morsch
41 Upper cut of prim. pT distribution set to 5. GeV
43 Revision 1.9 2000/09/18 10:41:35 morsch
44 Add possibility to use nuclear structure functions from PDF library V8.
46 Revision 1.8 2000/09/06 14:26:24 morsch
47 Decayer functionality of AliPythia has been moved to AliDecayerPythia.
48 Class is now a singleton.
50 Revision 1.7 2000/06/09 20:34:50 morsch
51 All coding rule violations except RS3 corrected
53 Revision 1.6 1999/11/09 07:38:48 fca
54 Changes for compatibility with version 2.23 of ROOT
56 Revision 1.5 1999/11/03 17:43:20 fca
57 New version from G.Martinez & A.Morsch
59 Revision 1.4 1999/09/29 09:24:14 fca
60 Introduction of the Copyright and cvs Log
65 #include "AliPythia.h"
69 //_____________________________________________________________________________
71 AliPythia* AliPythia::fgAliPythia=NULL;
73 AliPythia::AliPythia()
75 // Default Constructor
78 if (!sRandom) sRandom=fRandom;
82 void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
84 // Initialise the process to generate
87 fStrucFunc = strucfunc;
89 SetMDCY(Pycomp(111),1,0);
90 // select structure function
92 SetMSTP(51,strucfunc);
94 // Pythia initialisation for selected processes//
98 for (Int_t i=1; i<= 200; i++) {
101 // select charm production
107 // heavy quark masses
139 case kPyCharmUnforced:
148 case kPyBeautyUnforced:
158 // Minimum Bias pp-Collisions
161 // select Pythia min. bias model
163 SetMSUB(92,1); // single diffraction AB-->XB
164 SetMSUB(93,1); // single diffraction AB-->AX
165 SetMSUB(94,1); // double diffraction
166 SetMSUB(95,1); // low pt production
167 SetMSTP(81,1); // multiple interactions switched on
168 SetMSTP(82,3); // model with varying impact param. & a single Gaussian
169 SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of
170 // multiple interaction at a reference energy = 14000 GeV
171 SetPARP(89,14000.); // reference energy for the above parameter
172 SetPARP(90,0.174); // set exponent for energy dependence of pT_0
176 // no initial state radiation
178 // no final state radiation
193 SetMSTP(41,1); // all resonance decays switched on
195 Initialize("CMS","p","p",fEcms);
199 Int_t AliPythia::CheckedLuComp(Int_t kf)
201 // Check Lund particle code (for debugging)
203 printf("\n Lucomp kf,kc %d %d",kf,kc);
207 void AliPythia::SetNuclei(Int_t a1, Int_t a2)
209 // Treat protons as inside nuclei with mass numbers a1 and a2
210 // The MSTP array in the PYPARS common block is used to enable and
211 // select the nuclear structure functions.
212 // MSTP(52) : (D=1) choice of proton and nuclear structure-function library
213 // =1: internal PYTHIA acording to MSTP(51)
214 // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
215 // =3: PDFLIB proton s.f. with nuclar correction:
216 // MSTP( 51) = 1000xNPGROUP+NPSET
217 // MSTP(151) = 1000xNAGROUP+NASET
218 // MSTP(192) : Mass number of nucleus side 1
219 // MSTP(193) : Mass number of nucleus side 2
228 AliPythia* AliPythia::Instance()
230 // Set random number generator
234 fgAliPythia = new AliPythia();
239 void AliPythia::PrintParticles()
241 // Print list of particl properties
244 for (Int_t kf=0; kf<1000000; kf++) {
245 for (Int_t c = 1; c > -2; c-=2) {
247 Int_t kc = Pycomp(c*kf);
249 Float_t mass = GetPMAS(kc,1);
250 Float_t width = GetPMAS(kc,2);
251 Float_t tau = GetPMAS(kc,4);
253 char* name = new char[8];
258 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
259 c*kf, name, mass, width, tau);
263 printf("\n Number of particles %d \n \n", np);
266 void AliPythia::ResetDecayTable()
268 // Set default values for pythia decay switches
270 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
271 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
274 void AliPythia::SetDecayTable()
276 // Set default values for pythia decay switches
279 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
280 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
286 #define pyrset pyrset_
287 #define pyrget pyrget_
290 #define pyrset PYRSET
291 #define pyrget PYRGET
295 Double_t pyr(Int_t*) {return sRandom->Rndm();}
296 void pyrset(Int_t*,Int_t*) {}
297 void pyrget(Int_t*,Int_t*) {}