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 1.23 2002/05/06 07:17:29 morsch
19 Pyr gives random number r in interval 0 < r < 1.
21 Revision 1.22 2002/04/26 10:28:48 morsch
22 Option kPyBeautyPbMNR added (N. Carrer).
24 Revision 1.21 2002/03/25 14:46:16 morsch
25 Case kPyD0PbMNR added (N. Carrer).
27 Revision 1.20 2002/03/03 13:48:50 morsch
28 Option kPyCharmPbMNR added. Produce charm pairs in agreement with MNR
29 NLO calculations (Nicola Carrer).
31 Revision 1.19 2002/02/20 08:52:20 morsch
32 Correct documentation of SetNuclei method.
34 Revision 1.18 2002/02/07 10:43:06 morsch
35 Tuned pp-min.bias settings (M.Monteno, R.Ugoccioni and N.Carrer)
37 Revision 1.17 2001/12/19 15:40:43 morsch
38 For kPyJets enforce simple jet topology, i.e no initial or final state
39 gluon radiation and no primordial pT.
41 Revision 1.16 2001/10/12 11:13:59 morsch
42 Missing break statements added (thanks to Nicola Carrer)
44 Revision 1.15 2001/03/27 10:54:50 morsch
45 Add ResetDecayTable() and SsetDecayTable() methods.
47 Revision 1.14 2001/03/09 13:03:40 morsch
48 Process_t and Struc_Func_t moved to AliPythia.h
50 Revision 1.13 2000/12/18 08:55:35 morsch
51 Make AliPythia dependent generartors work with new scheme of random number generation
53 Revision 1.12 2000/11/30 07:12:50 alibrary
54 Introducing new Rndm and QA classes
56 Revision 1.11 2000/10/20 06:30:06 fca
57 Use version 0 to avoid streamer generation
59 Revision 1.10 2000/10/06 14:18:44 morsch
60 Upper cut of prim. pT distribution set to 5. GeV
62 Revision 1.9 2000/09/18 10:41:35 morsch
63 Add possibility to use nuclear structure functions from PDF library V8.
65 Revision 1.8 2000/09/06 14:26:24 morsch
66 Decayer functionality of AliPythia has been moved to AliDecayerPythia.
67 Class is now a singleton.
69 Revision 1.7 2000/06/09 20:34:50 morsch
70 All coding rule violations except RS3 corrected
72 Revision 1.6 1999/11/09 07:38:48 fca
73 Changes for compatibility with version 2.23 of ROOT
75 Revision 1.5 1999/11/03 17:43:20 fca
76 New version from G.Martinez & A.Morsch
78 Revision 1.4 1999/09/29 09:24:14 fca
79 Introduction of the Copyright and cvs Log
84 #include "AliPythia.h"
88 //_____________________________________________________________________________
90 AliPythia* AliPythia::fgAliPythia=NULL;
92 AliPythia::AliPythia()
94 // Default Constructor
97 if (!sRandom) sRandom=fRandom;
101 void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
103 // Initialise the process to generate
106 fStrucFunc = strucfunc;
108 SetMDCY(Pycomp(111),1,0);
109 // select structure function
111 SetMSTP(51,strucfunc);
113 // Pythia initialisation for selected processes//
117 for (Int_t i=1; i<= 200; i++) {
120 // select charm production
126 // heavy quark masses
158 case kPyCharmUnforced:
167 case kPyBeautyUnforced:
177 // Minimum Bias pp-Collisions
180 // select Pythia min. bias model
182 SetMSUB(92,1); // single diffraction AB-->XB
183 SetMSUB(93,1); // single diffraction AB-->AX
184 SetMSUB(94,1); // double diffraction
185 SetMSUB(95,1); // low pt production
186 SetMSTP(81,1); // multiple interactions switched on
187 SetMSTP(82,3); // model with varying impact param. & a single Gaussian
188 SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of
189 // multiple interaction at a reference energy = 14000 GeV
190 SetPARP(89,14000.); // reference energy for the above parameter
191 SetPARP(90,0.174); // set exponent for energy dependence of pT_0
193 // Minimum Bias pp-Collisions
196 // select Pythia min. bias model
198 SetMSUB(95,1); // low pt production
199 SetMSTP(81,1); // multiple interactions switched on
200 SetMSTP(82,3); // model with varying impact param. & a single Gaussian
201 SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of
202 // multiple interaction at a reference energy = 14000 GeV
203 SetPARP(89,14000.); // reference energy for the above parameter
204 SetPARP(90,0.174); // set exponent for energy dependence of pT_0
209 // no initial state radiation
211 // no final state radiation
225 // Tuning of Pythia parameters aimed to get a resonable agreement
226 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
227 // c-cbar single inclusive and double differential distributions.
228 // This parameter settings are meant to work with Pb-Pb collisions
229 // (AliGenPythia::SetNuclei) and with kCTEQ_4L PDFs.
230 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
231 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
236 // No multiple interactions
241 // Initial/final parton shower on (Pythia default)
262 // Tuning of Pythia parameters aimed to get a resonable agreement
263 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
264 // b-bbar single inclusive and double differential distributions.
265 // This parameter settings are meant to work with Pb-Pb collisions
266 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
267 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
268 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
273 // No multiple interactions
278 // Initial/final parton shower on (Pythia default)
303 SetMSTP(41,1); // all resonance decays switched on
305 Initialize("CMS","p","p",fEcms);
309 Int_t AliPythia::CheckedLuComp(Int_t kf)
311 // Check Lund particle code (for debugging)
313 printf("\n Lucomp kf,kc %d %d",kf,kc);
317 void AliPythia::SetNuclei(Int_t a1, Int_t a2)
319 // Treat protons as inside nuclei with mass numbers a1 and a2
320 // The MSTP array in the PYPARS common block is used to enable and
321 // select the nuclear structure functions.
322 // MSTP(52) : (D=1) choice of proton and nuclear structure-function library
323 // =1: internal PYTHIA acording to MSTP(51)
324 // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
325 // If the following mass number both not equal zero, nuclear corrections of the stf are used.
326 // MSTP(192) : Mass number of nucleus side 1
327 // MSTP(193) : Mass number of nucleus side 2
334 AliPythia* AliPythia::Instance()
336 // Set random number generator
340 fgAliPythia = new AliPythia();
345 void AliPythia::PrintParticles()
347 // Print list of particl properties
350 for (Int_t kf=0; kf<1000000; kf++) {
351 for (Int_t c = 1; c > -2; c-=2) {
353 Int_t kc = Pycomp(c*kf);
355 Float_t mass = GetPMAS(kc,1);
356 Float_t width = GetPMAS(kc,2);
357 Float_t tau = GetPMAS(kc,4);
359 char* name = new char[8];
364 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
365 c*kf, name, mass, width, tau);
369 printf("\n Number of particles %d \n \n", np);
372 void AliPythia::ResetDecayTable()
374 // Set default values for pythia decay switches
376 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
377 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
380 void AliPythia::SetDecayTable()
382 // Set default values for pythia decay switches
385 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
386 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
392 #define pyrset pyrset_
393 #define pyrget pyrget_
396 #define pyrset PYRSET
397 #define pyrget PYRGET
404 do r=sRandom->Rndm(); while(0 >= r || r >= 1);
407 void pyrset(Int_t*,Int_t*) {}
408 void pyrget(Int_t*,Int_t*) {}