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 1.25 2002/10/14 14:55:35 hristov
19 Merging the VirtualMC branch to the main development branch (HEAD)
21 Revision 1.20.6.1 2002/06/10 14:57:41 hristov
24 Revision 1.24 2002/05/22 13:22:53 morsch
25 Process kPyMbNonDiffr added.
27 Revision 1.23 2002/05/06 07:17:29 morsch
28 Pyr gives random number r in interval 0 < r < 1.
30 Revision 1.22 2002/04/26 10:28:48 morsch
31 Option kPyBeautyPbMNR added (N. Carrer).
33 Revision 1.21 2002/03/25 14:46:16 morsch
34 Case kPyD0PbMNR added (N. Carrer).
36 Revision 1.20 2002/03/03 13:48:50 morsch
37 Option kPyCharmPbMNR added. Produce charm pairs in agreement with MNR
38 NLO calculations (Nicola Carrer).
40 Revision 1.19 2002/02/20 08:52:20 morsch
41 Correct documentation of SetNuclei method.
43 Revision 1.18 2002/02/07 10:43:06 morsch
44 Tuned pp-min.bias settings (M.Monteno, R.Ugoccioni and N.Carrer)
46 Revision 1.17 2001/12/19 15:40:43 morsch
47 For kPyJets enforce simple jet topology, i.e no initial or final state
48 gluon radiation and no primordial pT.
50 Revision 1.16 2001/10/12 11:13:59 morsch
51 Missing break statements added (thanks to Nicola Carrer)
53 Revision 1.15 2001/03/27 10:54:50 morsch
54 Add ResetDecayTable() and SsetDecayTable() methods.
56 Revision 1.14 2001/03/09 13:03:40 morsch
57 Process_t and Struc_Func_t moved to AliPythia.h
59 Revision 1.13 2000/12/18 08:55:35 morsch
60 Make AliPythia dependent generartors work with new scheme of random number generation
62 Revision 1.12 2000/11/30 07:12:50 alibrary
63 Introducing new Rndm and QA classes
65 Revision 1.11 2000/10/20 06:30:06 fca
66 Use version 0 to avoid streamer generation
68 Revision 1.10 2000/10/06 14:18:44 morsch
69 Upper cut of prim. pT distribution set to 5. GeV
71 Revision 1.9 2000/09/18 10:41:35 morsch
72 Add possibility to use nuclear structure functions from PDF library V8.
74 Revision 1.8 2000/09/06 14:26:24 morsch
75 Decayer functionality of AliPythia has been moved to AliDecayerPythia.
76 Class is now a singleton.
78 Revision 1.7 2000/06/09 20:34:50 morsch
79 All coding rule violations except RS3 corrected
81 Revision 1.6 1999/11/09 07:38:48 fca
82 Changes for compatibility with version 2.23 of ROOT
84 Revision 1.5 1999/11/03 17:43:20 fca
85 New version from G.Martinez & A.Morsch
87 Revision 1.4 1999/09/29 09:24:14 fca
88 Introduction of the Copyright and cvs Log
93 #include "AliPythia.h"
97 //_____________________________________________________________________________
99 AliPythia* AliPythia::fgAliPythia=NULL;
101 AliPythia::AliPythia()
103 // Default Constructor
106 if (!sRandom) sRandom=fRandom;
110 void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
112 // Initialise the process to generate
115 fStrucFunc = strucfunc;
117 SetMDCY(Pycomp(111),1,0);
118 // select structure function
120 SetMSTP(51,strucfunc);
122 // Pythia initialisation for selected processes//
126 for (Int_t i=1; i<= 200; i++) {
129 // select charm production
135 // heavy quark masses
167 case kPyCharmUnforced:
176 case kPyBeautyUnforced:
186 // Minimum Bias pp-Collisions
189 // select Pythia min. bias model
191 SetMSUB(92,1); // single diffraction AB-->XB
192 SetMSUB(93,1); // single diffraction AB-->AX
193 SetMSUB(94,1); // double diffraction
194 SetMSUB(95,1); // low pt production
195 SetMSTP(81,1); // multiple interactions switched on
196 SetMSTP(82,3); // model with varying impact param. & a single Gaussian
197 SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of
198 // multiple interaction at a reference energy = 14000 GeV
199 SetPARP(89,14000.); // reference energy for the above parameter
200 SetPARP(90,0.174); // set exponent for energy dependence of pT_0
202 // Minimum Bias pp-Collisions
205 // select Pythia min. bias model
207 SetMSUB(95,1); // low pt production
208 SetMSTP(81,1); // multiple interactions switched on
209 SetMSTP(82,3); // model with varying impact param. & a single Gaussian
210 SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of
211 // multiple interaction at a reference energy = 14000 GeV
212 SetPARP(89,14000.); // reference energy for the above parameter
213 SetPARP(90,0.174); // set exponent for energy dependence of pT_0
218 printf("\n*************************************************\n");
219 printf("\nWARNING !\n");
220 printf("The kPyJet option uses simplified jet-production\n");
221 printf("without gluon radiation \n");
222 printf("\n*************************************************\n");
225 // no initial state radiation
227 // no final state radiation
241 // Tuning of Pythia parameters aimed to get a resonable agreement
242 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
243 // c-cbar single inclusive and double differential distributions.
244 // This parameter settings are meant to work with Pb-Pb collisions
245 // (AliGenPythia::SetNuclei) and with kCTEQ_4L PDFs.
246 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
247 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
252 // No multiple interactions
257 // Initial/final parton shower on (Pythia default)
278 // Tuning of Pythia parameters aimed to get a resonable agreement
279 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
280 // b-bbar single inclusive and double differential distributions.
281 // This parameter settings are meant to work with Pb-Pb collisions
282 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
283 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
284 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
289 // No multiple interactions
294 // Initial/final parton shower on (Pythia default)
319 SetMSTP(41,1); // all resonance decays switched on
321 Initialize("CMS","p","p",fEcms);
325 Int_t AliPythia::CheckedLuComp(Int_t kf)
327 // Check Lund particle code (for debugging)
329 printf("\n Lucomp kf,kc %d %d",kf,kc);
333 void AliPythia::SetNuclei(Int_t a1, Int_t a2)
335 // Treat protons as inside nuclei with mass numbers a1 and a2
336 // The MSTP array in the PYPARS common block is used to enable and
337 // select the nuclear structure functions.
338 // MSTP(52) : (D=1) choice of proton and nuclear structure-function library
339 // =1: internal PYTHIA acording to MSTP(51)
340 // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
341 // If the following mass number both not equal zero, nuclear corrections of the stf are used.
342 // MSTP(192) : Mass number of nucleus side 1
343 // MSTP(193) : Mass number of nucleus side 2
350 AliPythia* AliPythia::Instance()
352 // Set random number generator
356 fgAliPythia = new AliPythia();
361 void AliPythia::PrintParticles()
363 // Print list of particl properties
366 for (Int_t kf=0; kf<1000000; kf++) {
367 for (Int_t c = 1; c > -2; c-=2) {
369 Int_t kc = Pycomp(c*kf);
371 Float_t mass = GetPMAS(kc,1);
372 Float_t width = GetPMAS(kc,2);
373 Float_t tau = GetPMAS(kc,4);
375 char* name = new char[8];
380 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
381 c*kf, name, mass, width, tau);
385 printf("\n Number of particles %d \n \n", np);
388 void AliPythia::ResetDecayTable()
390 // Set default values for pythia decay switches
392 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
393 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
396 void AliPythia::SetDecayTable()
398 // Set default values for pythia decay switches
401 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
402 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
408 #define pyrset pyrset_
409 #define pyrget pyrget_
412 #define pyrset PYRSET
413 #define pyrget PYRGET
420 do r=sRandom->Rndm(); while(0 >= r || r >= 1);
423 void pyrset(Int_t*,Int_t*) {}
424 void pyrget(Int_t*,Int_t*) {}