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 1.28 2002/12/09 08:22:56 morsch
19 UA1 jet finder (Pycell) for software triggering added.
21 Revision 1.27 2002/11/15 00:39:37 morsch
22 - Correct initialisation of sRandom.
23 - QCD Jets with initial and final state gluon radiation is default
24 - pt kick for jets default
25 - Interface to Pyclus added.
27 Revision 1.26 2002/11/14 00:37:32 morsch
28 Warning message for kPyJets added.
30 Revision 1.25 2002/10/14 14:55:35 hristov
31 Merging the VirtualMC branch to the main development branch (HEAD)
33 Revision 1.20.6.1 2002/06/10 14:57:41 hristov
36 Revision 1.24 2002/05/22 13:22:53 morsch
37 Process kPyMbNonDiffr added.
39 Revision 1.23 2002/05/06 07:17:29 morsch
40 Pyr gives random number r in interval 0 < r < 1.
42 Revision 1.22 2002/04/26 10:28:48 morsch
43 Option kPyBeautyPbMNR added (N. Carrer).
45 Revision 1.21 2002/03/25 14:46:16 morsch
46 Case kPyD0PbMNR added (N. Carrer).
48 Revision 1.20 2002/03/03 13:48:50 morsch
49 Option kPyCharmPbMNR added. Produce charm pairs in agreement with MNR
50 NLO calculations (Nicola Carrer).
52 Revision 1.19 2002/02/20 08:52:20 morsch
53 Correct documentation of SetNuclei method.
55 Revision 1.18 2002/02/07 10:43:06 morsch
56 Tuned pp-min.bias settings (M.Monteno, R.Ugoccioni and N.Carrer)
58 Revision 1.17 2001/12/19 15:40:43 morsch
59 For kPyJets enforce simple jet topology, i.e no initial or final state
60 gluon radiation and no primordial pT.
62 Revision 1.16 2001/10/12 11:13:59 morsch
63 Missing break statements added (thanks to Nicola Carrer)
65 Revision 1.15 2001/03/27 10:54:50 morsch
66 Add ResetDecayTable() and SsetDecayTable() methods.
68 Revision 1.14 2001/03/09 13:03:40 morsch
69 Process_t and Struc_Func_t moved to AliPythia.h
71 Revision 1.13 2000/12/18 08:55:35 morsch
72 Make AliPythia dependent generartors work with new scheme of random number generation
74 Revision 1.12 2000/11/30 07:12:50 alibrary
75 Introducing new Rndm and QA classes
77 Revision 1.11 2000/10/20 06:30:06 fca
78 Use version 0 to avoid streamer generation
80 Revision 1.10 2000/10/06 14:18:44 morsch
81 Upper cut of prim. pT distribution set to 5. GeV
83 Revision 1.9 2000/09/18 10:41:35 morsch
84 Add possibility to use nuclear structure functions from PDF library V8.
86 Revision 1.8 2000/09/06 14:26:24 morsch
87 Decayer functionality of AliPythia has been moved to AliDecayerPythia.
88 Class is now a singleton.
90 Revision 1.7 2000/06/09 20:34:50 morsch
91 All coding rule violations except RS3 corrected
93 Revision 1.6 1999/11/09 07:38:48 fca
94 Changes for compatibility with version 2.23 of ROOT
96 Revision 1.5 1999/11/03 17:43:20 fca
97 New version from G.Martinez & A.Morsch
99 Revision 1.4 1999/09/29 09:24:14 fca
100 Introduction of the Copyright and cvs Log
105 #include "AliPythia.h"
110 # define pyclus pyclus_
111 # define pycell pycell_
112 # define type_of_call
114 # define pyclus PYCLUS
115 # define pycell PYCELL
116 # define type_of_call _stdcall
119 extern "C" void type_of_call pyclus(Int_t & );
120 extern "C" void type_of_call pycell(Int_t & );
122 //_____________________________________________________________________________
124 AliPythia* AliPythia::fgAliPythia=NULL;
126 AliPythia::AliPythia()
128 // Default Constructor
131 if (!sRandom) sRandom=fRandom;
135 void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
137 // Initialise the process to generate
138 if (!sRandom) sRandom = gRandom;
142 fStrucFunc = strucfunc;
144 SetMDCY(Pycomp(111),1,0);
145 // select structure function
147 SetMSTP(51,strucfunc);
149 // Pythia initialisation for selected processes//
153 for (Int_t i=1; i<= 200; i++) {
156 // select charm production
162 // heavy quark masses
194 case kPyCharmUnforced:
203 case kPyBeautyUnforced:
213 // Minimum Bias pp-Collisions
216 // select Pythia min. bias model
218 SetMSUB(92,1); // single diffraction AB-->XB
219 SetMSUB(93,1); // single diffraction AB-->AX
220 SetMSUB(94,1); // double diffraction
221 SetMSUB(95,1); // low pt production
222 SetMSTP(81,1); // multiple interactions switched on
223 SetMSTP(82,3); // model with varying impact param. & a single Gaussian
224 SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of
225 // multiple interaction at a reference energy = 14000 GeV
226 SetPARP(89,14000.); // reference energy for the above parameter
227 SetPARP(90,0.174); // set exponent for energy dependence of pT_0
229 // Minimum Bias pp-Collisions
232 // select Pythia min. bias model
234 SetMSUB(95,1); // low pt production
235 SetMSTP(81,1); // multiple interactions switched on
236 SetMSTP(82,3); // model with varying impact param. & a single Gaussian
237 SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of
238 // multiple interaction at a reference energy = 14000 GeV
239 SetPARP(89,14000.); // reference energy for the above parameter
240 SetPARP(90,0.174); // set exponent for energy dependence of pT_0
254 // Tuning of Pythia parameters aimed to get a resonable agreement
255 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
256 // c-cbar single inclusive and double differential distributions.
257 // This parameter settings are meant to work with Pb-Pb collisions
258 // (AliGenPythia::SetNuclei) and with kCTEQ_4L PDFs.
259 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
260 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
265 // No multiple interactions
270 // Initial/final parton shower on (Pythia default)
291 // Tuning of Pythia parameters aimed to get a resonable agreement
292 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
293 // b-bbar single inclusive and double differential distributions.
294 // This parameter settings are meant to work with Pb-Pb collisions
295 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
296 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
297 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
302 // No multiple interactions
307 // Initial/final parton shower on (Pythia default)
332 SetMSTP(41,1); // all resonance decays switched on
334 Initialize("CMS","p","p",fEcms);
338 Int_t AliPythia::CheckedLuComp(Int_t kf)
340 // Check Lund particle code (for debugging)
342 printf("\n Lucomp kf,kc %d %d",kf,kc);
346 void AliPythia::SetNuclei(Int_t a1, Int_t a2)
348 // Treat protons as inside nuclei with mass numbers a1 and a2
349 // The MSTP array in the PYPARS common block is used to enable and
350 // select the nuclear structure functions.
351 // MSTP(52) : (D=1) choice of proton and nuclear structure-function library
352 // =1: internal PYTHIA acording to MSTP(51)
353 // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
354 // If the following mass number both not equal zero, nuclear corrections of the stf are used.
355 // MSTP(192) : Mass number of nucleus side 1
356 // MSTP(193) : Mass number of nucleus side 2
363 AliPythia* AliPythia::Instance()
365 // Set random number generator
369 fgAliPythia = new AliPythia();
374 void AliPythia::PrintParticles()
376 // Print list of particl properties
379 for (Int_t kf=0; kf<1000000; kf++) {
380 for (Int_t c = 1; c > -2; c-=2) {
382 Int_t kc = Pycomp(c*kf);
384 Float_t mass = GetPMAS(kc,1);
385 Float_t width = GetPMAS(kc,2);
386 Float_t tau = GetPMAS(kc,4);
388 char* name = new char[8];
393 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
394 c*kf, name, mass, width, tau);
398 printf("\n Number of particles %d \n \n", np);
401 void AliPythia::ResetDecayTable()
403 // Set default values for pythia decay switches
405 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
406 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
409 void AliPythia::SetDecayTable()
411 // Set default values for pythia decay switches
414 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
415 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
418 void AliPythia::Pyclus(Int_t& njet)
420 // Call Pythia clustering algorithm
425 void AliPythia::Pycell(Int_t& njet)
427 // Call Pythia jet reconstruction algorithm
436 #define pyrset pyrset_
437 #define pyrget pyrget_
438 #define pyclus pyclus_
439 #define pycell pycell_
442 #define pyrset PYRSET
443 #define pyrget PYRGET
444 #define pyclus PYCLUS
445 #define pycell PYCELL
452 do r=sRandom->Rndm(); while(0 >= r || r >= 1);
455 void pyrset(Int_t*,Int_t*) {}
456 void pyrget(Int_t*,Int_t*) {}