Fix to avoid divide by zero problem in MedianHitG and MedianHitL for track
[u/mrichter/AliRoot.git] / EVGEN / AliGenMC.cxx
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e36044d6 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$Log$
65de9f86 18Revision 1.8 2002/04/26 10:42:35 morsch
19Case kNoDecayHeavy added. (N. Carrer)
20
d5f86442 21Revision 1.7 2002/04/17 10:32:32 morsch
22Coding Rule violations corrected.
23
62d0ae06 24Revision 1.6 2002/03/26 14:19:36 morsch
25Saver calculation of rapdity.
26
fef61e14 27Revision 1.5 2002/03/12 17:02:20 morsch
28Change in calculation of rapidity, include case in which numerically e == pz.
29
95450c6d 30Revision 1.4 2001/11/27 13:13:07 morsch
31Maximum lifetime for long-lived particles to be put on the stack is parameter.
32It can be set via SetMaximumLifetime(..).
33
47fc6bd5 34Revision 1.3 2001/10/16 08:48:56 morsch
35Common vertex related code moved to base class AliGenerator.
36
b80a8e41 37Revision 1.2 2001/10/15 08:15:51 morsch
38Event vertex and vertex truncation setting moved into AliMC.
39
dba8ac91 40Revision 1.1 2001/07/13 10:56:00 morsch
41AliGenMC base class for AliGenParam and AliGenPythia commonalities.
42
e36044d6 43*/
44
62d0ae06 45// Base class for generators using external MC generators.
46// For example AliGenPythia using Pythia.
47// Provides basic functionality: setting of kinematic cuts on
48// decay products and particle selection.
49// andreas.morsch@cern.ch
50
e36044d6 51#include "AliGenMC.h"
52#include "AliPDG.h"
65de9f86 53#include <TMath.h>
e36044d6 54#include <TParticle.h>
55
56 ClassImp(AliGenMC)
57
58AliGenMC::AliGenMC()
59 :AliGenerator()
60{
61// Default Constructor
62 SetCutOnChild();
63 SetChildMomentumRange();
64 SetChildPtRange();
65 SetChildPhiRange();
66 SetChildThetaRange();
67 SetChildYRange();
47fc6bd5 68 SetMaximumLifetime();
65de9f86 69 SetGeometryAcceptance();
70 SetPdgCodeParticleforAcceptanceCut();
71 SetNumberOfAcceptedParticles();
e36044d6 72}
73
74AliGenMC::AliGenMC(Int_t npart)
75 :AliGenerator(npart)
76{
77// Constructor
78 SetCutOnChild();
79 SetChildMomentumRange();
80 SetChildPtRange();
81 SetChildPhiRange();
82 SetChildThetaRange();
83 SetChildYRange();
84//
85 fParentSelect.Set(8);
86 fChildSelect.Set(8);
87 for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
47fc6bd5 88 SetMaximumLifetime();
65de9f86 89 SetGeometryAcceptance();
90 SetPdgCodeParticleforAcceptanceCut();
91 SetNumberOfAcceptedParticles();
e36044d6 92}
93
94AliGenMC::AliGenMC(const AliGenMC & mc)
95{
96// copy constructor
97}
98
99AliGenMC::~AliGenMC()
100{
101// Destructor
102}
103
104void AliGenMC::Init()
105{
106//
107// Initialization
108 switch (fForceDecay) {
109 case kSemiElectronic:
110 case kDiElectron:
111 case kBJpsiDiElectron:
112 case kBPsiPrimeDiElectron:
47fc6bd5 113 fChildSelect[0] = kElectron;
e36044d6 114 break;
115 case kSemiMuonic:
116 case kDiMuon:
117 case kBJpsiDiMuon:
118 case kBPsiPrimeDiMuon:
119 case kPiToMu:
120 case kKaToMu:
121 fChildSelect[0]=kMuonMinus;
122 break;
123 case kHadronicD:
124 fChildSelect[0]=kPiPlus;
125 fChildSelect[1]=kKPlus;
126 break;
62d0ae06 127 case kOmega:
e36044d6 128 case kAll:
129 case kNoDecay:
d5f86442 130 case kNoDecayHeavy:
e36044d6 131 break;
132 }
133}
134
135
62d0ae06 136Bool_t AliGenMC::ParentSelected(Int_t ip) const
e36044d6 137{
138// True if particle is in list of parent particles to be selected
139 for (Int_t i=0; i<8; i++)
140 {
62d0ae06 141 if (fParentSelect.At(i) == ip) return kTRUE;
e36044d6 142 }
143 return kFALSE;
144}
145
62d0ae06 146Bool_t AliGenMC::ChildSelected(Int_t ip) const
e36044d6 147{
148// True if particle is in list of decay products to be selected
149 for (Int_t i=0; i<5; i++)
150 {
62d0ae06 151 if (fChildSelect.At(i) == ip) return kTRUE;
e36044d6 152 }
153 return kFALSE;
154}
155
62d0ae06 156Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
e36044d6 157{
158// Perform kinematic selection
159 Float_t px = particle->Px();
160 Float_t py = particle->Py();
161 Float_t pz = particle->Pz();
162 Float_t e = particle->Energy();
163 Float_t pt = particle->Pt();
164 Float_t p = particle->P();
165 Float_t theta = particle->Theta();
95450c6d 166 Float_t mass = particle->GetMass();
167 Float_t mt2 = pt * pt + mass * mass;
168
e36044d6 169 Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px)));
95450c6d 170 Double_t y, y0;
171
fef61e14 172 if (TMath::Abs(pz) < e) {
95450c6d 173 y = 0.5*TMath::Log((e+pz)/(e-pz));
174 } else {
175 y = 1.e10;
176 }
e36044d6 177
95450c6d 178 if (mt2) {
179 y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2);
e36044d6 180 } else {
95450c6d 181 if (TMath::Abs(y) < 1.e10) {
182 y0 = y;
183 } else {
184 y0 = 1.e10;
185 }
e36044d6 186 }
95450c6d 187
188 y = (pz < 0) ? -y0 : y0;
e36044d6 189
190 if (flag == 0) {
191//
192// Primary particle cuts
193//
194// transverse momentum cut
195 if (pt > fPtMax || pt < fPtMin) {
196// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
197 return kFALSE;
198 }
199//
200// momentum cut
201 if (p > fPMax || p < fPMin) {
202// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
203 return kFALSE;
204 }
205//
206// theta cut
207 if (theta > fThetaMax || theta < fThetaMin) {
208// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
209 return kFALSE;
210 }
211//
212// rapidity cut
213 if (y > fYMax || y < fYMin) {
214// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
215 return kFALSE;
216 }
217//
218// phi cut
219 if (phi > fPhiMax || phi < fPhiMin) {
220// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
221 return kFALSE;
222 }
223 } else {
224//
225// Decay product cuts
226//
227// transverse momentum cut
228 if (pt > fChildPtMax || pt < fChildPtMin) {
229// printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
230 return kFALSE;
231 }
232//
233// momentum cut
234 if (p > fChildPMax || p < fChildPMin) {
235// printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
236 return kFALSE;
237 }
238//
239// theta cut
240 if (theta > fChildThetaMax || theta < fChildThetaMin) {
241// printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
242 return kFALSE;
243 }
244//
245// rapidity cut
246 if (y > fChildYMax || y < fChildYMin) {
247// printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
248 return kFALSE;
249 }
250//
251// phi cut
252 if (phi > fChildPhiMax || phi < fChildPhiMin) {
253// printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
254 return kFALSE;
255 }
256 }
257
e36044d6 258 return kTRUE;
259}
260
65de9f86 261Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
262{
263 Bool_t Check ; // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance
264 Int_t NumberOfPdgCodeParticleforAcceptanceCut=0;
265 Int_t NumberOfAcceptedPdgCodeParticleforAcceptanceCut=0;
266 TParticle * particle;
267 Int_t i;
268 for (i=0; i<np; i++) {
269 particle = (TParticle *) particles->At(i);
270 if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
271 NumberOfPdgCodeParticleforAcceptanceCut++;
272 if (fGeometryAcceptance->Impact(particle)) NumberOfAcceptedPdgCodeParticleforAcceptanceCut++;
273 }
274 }
275 if ( NumberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
276 Check = kTRUE;
277 else
278 Check = kFALSE;
279
280 return Check;
281}
282
62d0ae06 283Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
e36044d6 284{
285//
286// If the particle is in a diffractive state, then take action accordingly
287 switch (pdgcode) {
288 case 91:
289 return 92;
290 case 110:
291 //rho_diff0 -- difficult to translate, return rho0
292 return 113;
293 case 210:
294 //pi_diffr+ -- change to pi+
295 return 211;
296 case 220:
297 //omega_di0 -- change to omega0
298 return 223;
299 case 330:
300 //phi_diff0 -- return phi0
301 return 333;
302 case 440:
303 //J/psi_di0 -- return J/psi
304 return 443;
305 case 2110:
306 //n_diffr -- return neutron
307 return 2112;
308 case 2210:
309 //p_diffr+ -- return proton
310 return 2212;
311 }
312 //non diffractive state -- return code unchanged
313 return pdgcode;
314}
315
316AliGenMC& AliGenMC::operator=(const AliGenMC& rhs)
317{
318// Assignment operator
319 return *this;
320}
321