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 1.10 2002/06/05 14:05:46 morsch
19 Decayer option kPhiKK for forced phi->K+K- decay added.
21 Revision 1.9 2002/05/30 14:58:29 morsch
22 Add pointer to AliGeometry to handle geometrical acceptance. (G. MArtinez)
24 Revision 1.8 2002/04/26 10:42:35 morsch
25 Case kNoDecayHeavy added. (N. Carrer)
27 Revision 1.7 2002/04/17 10:32:32 morsch
28 Coding Rule violations corrected.
30 Revision 1.6 2002/03/26 14:19:36 morsch
31 Saver calculation of rapdity.
33 Revision 1.5 2002/03/12 17:02:20 morsch
34 Change in calculation of rapidity, include case in which numerically e == pz.
36 Revision 1.4 2001/11/27 13:13:07 morsch
37 Maximum lifetime for long-lived particles to be put on the stack is parameter.
38 It can be set via SetMaximumLifetime(..).
40 Revision 1.3 2001/10/16 08:48:56 morsch
41 Common vertex related code moved to base class AliGenerator.
43 Revision 1.2 2001/10/15 08:15:51 morsch
44 Event vertex and vertex truncation setting moved into AliMC.
46 Revision 1.1 2001/07/13 10:56:00 morsch
47 AliGenMC base class for AliGenParam and AliGenPythia commonalities.
51 // Base class for generators using external MC generators.
52 // For example AliGenPythia using Pythia.
53 // Provides basic functionality: setting of kinematic cuts on
54 // decay products and particle selection.
55 // andreas.morsch@cern.ch
60 #include <TParticle.h>
67 // Default Constructor
69 SetChildMomentumRange();
75 SetGeometryAcceptance();
76 SetPdgCodeParticleforAcceptanceCut();
77 SetNumberOfAcceptedParticles();
80 AliGenMC::AliGenMC(Int_t npart)
85 SetChildMomentumRange();
93 for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
95 SetGeometryAcceptance();
96 SetPdgCodeParticleforAcceptanceCut();
97 SetNumberOfAcceptedParticles();
100 AliGenMC::AliGenMC(const AliGenMC & mc)
105 AliGenMC::~AliGenMC()
110 void AliGenMC::Init()
114 switch (fForceDecay) {
115 case kSemiElectronic:
117 case kBJpsiDiElectron:
118 case kBPsiPrimeDiElectron:
119 fChildSelect[0] = kElectron;
124 case kBPsiPrimeDiMuon:
127 fChildSelect[0]=kMuonMinus;
130 fChildSelect[0]=kPiPlus;
131 fChildSelect[1]=kKPlus;
134 fChildSelect[0]=kKPlus;
144 Bool_t AliGenMC::ParentSelected(Int_t ip) const
146 // True if particle is in list of parent particles to be selected
147 for (Int_t i=0; i<8; i++)
149 if (fParentSelect.At(i) == ip) return kTRUE;
154 Bool_t AliGenMC::ChildSelected(Int_t ip) const
156 // True if particle is in list of decay products to be selected
157 for (Int_t i=0; i<5; i++)
159 if (fChildSelect.At(i) == ip) return kTRUE;
164 Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
166 // Perform kinematic selection
167 Float_t px = particle->Px();
168 Float_t py = particle->Py();
169 Float_t pz = particle->Pz();
170 Float_t e = particle->Energy();
171 Float_t pt = particle->Pt();
172 Float_t p = particle->P();
173 Float_t theta = particle->Theta();
174 Float_t mass = particle->GetMass();
175 Float_t mt2 = pt * pt + mass * mass;
177 Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px)));
180 if (TMath::Abs(pz) < e) {
181 y = 0.5*TMath::Log((e+pz)/(e-pz));
187 y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2);
189 if (TMath::Abs(y) < 1.e10) {
196 y = (pz < 0) ? -y0 : y0;
200 // Primary particle cuts
202 // transverse momentum cut
203 if (pt > fPtMax || pt < fPtMin) {
204 // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
209 if (p > fPMax || p < fPMin) {
210 // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
215 if (theta > fThetaMax || theta < fThetaMin) {
216 // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
221 if (y > fYMax || y < fYMin) {
222 // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
227 if (phi > fPhiMax || phi < fPhiMin) {
228 // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
233 // Decay product cuts
235 // transverse momentum cut
236 if (pt > fChildPtMax || pt < fChildPtMin) {
237 // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
242 if (p > fChildPMax || p < fChildPMin) {
243 // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
248 if (theta > fChildThetaMax || theta < fChildThetaMin) {
249 // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
254 if (y > fChildYMax || y < fChildYMin) {
255 // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
260 if (phi > fChildPhiMax || phi < fChildPhiMin) {
261 // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
269 Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
271 Bool_t Check ; // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance
272 Int_t NumberOfPdgCodeParticleforAcceptanceCut=0;
273 Int_t NumberOfAcceptedPdgCodeParticleforAcceptanceCut=0;
274 TParticle * particle;
276 for (i=0; i<np; i++) {
277 particle = (TParticle *) particles->At(i);
278 if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
279 NumberOfPdgCodeParticleforAcceptanceCut++;
280 if (fGeometryAcceptance->Impact(particle)) NumberOfAcceptedPdgCodeParticleforAcceptanceCut++;
283 if ( NumberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
291 Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
294 // If the particle is in a diffractive state, then take action accordingly
299 //rho_diff0 -- difficult to translate, return rho0
302 //pi_diffr+ -- change to pi+
305 //omega_di0 -- change to omega0
308 //phi_diff0 -- return phi0
311 //J/psi_di0 -- return J/psi
314 //n_diffr -- return neutron
317 //p_diffr+ -- return proton
320 //non diffractive state -- return code unchanged
324 AliGenMC& AliGenMC::operator=(const AliGenMC& rhs)
326 // Assignment operator