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 1.9 2002/05/30 14:58:29 morsch
19 Add pointer to AliGeometry to handle geometrical acceptance. (G. MArtinez)
21 Revision 1.8 2002/04/26 10:42:35 morsch
22 Case kNoDecayHeavy added. (N. Carrer)
24 Revision 1.7 2002/04/17 10:32:32 morsch
25 Coding Rule violations corrected.
27 Revision 1.6 2002/03/26 14:19:36 morsch
28 Saver calculation of rapdity.
30 Revision 1.5 2002/03/12 17:02:20 morsch
31 Change in calculation of rapidity, include case in which numerically e == pz.
33 Revision 1.4 2001/11/27 13:13:07 morsch
34 Maximum lifetime for long-lived particles to be put on the stack is parameter.
35 It can be set via SetMaximumLifetime(..).
37 Revision 1.3 2001/10/16 08:48:56 morsch
38 Common vertex related code moved to base class AliGenerator.
40 Revision 1.2 2001/10/15 08:15:51 morsch
41 Event vertex and vertex truncation setting moved into AliMC.
43 Revision 1.1 2001/07/13 10:56:00 morsch
44 AliGenMC base class for AliGenParam and AliGenPythia commonalities.
48 // Base class for generators using external MC generators.
49 // For example AliGenPythia using Pythia.
50 // Provides basic functionality: setting of kinematic cuts on
51 // decay products and particle selection.
52 // andreas.morsch@cern.ch
57 #include <TParticle.h>
64 // Default Constructor
66 SetChildMomentumRange();
72 SetGeometryAcceptance();
73 SetPdgCodeParticleforAcceptanceCut();
74 SetNumberOfAcceptedParticles();
77 AliGenMC::AliGenMC(Int_t npart)
82 SetChildMomentumRange();
90 for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
92 SetGeometryAcceptance();
93 SetPdgCodeParticleforAcceptanceCut();
94 SetNumberOfAcceptedParticles();
97 AliGenMC::AliGenMC(const AliGenMC & mc)
102 AliGenMC::~AliGenMC()
107 void AliGenMC::Init()
111 switch (fForceDecay) {
112 case kSemiElectronic:
114 case kBJpsiDiElectron:
115 case kBPsiPrimeDiElectron:
116 fChildSelect[0] = kElectron;
121 case kBPsiPrimeDiMuon:
124 fChildSelect[0]=kMuonMinus;
127 fChildSelect[0]=kPiPlus;
128 fChildSelect[1]=kKPlus;
140 Bool_t AliGenMC::ParentSelected(Int_t ip) const
142 // True if particle is in list of parent particles to be selected
143 for (Int_t i=0; i<8; i++)
145 if (fParentSelect.At(i) == ip) return kTRUE;
150 Bool_t AliGenMC::ChildSelected(Int_t ip) const
152 // True if particle is in list of decay products to be selected
153 for (Int_t i=0; i<5; i++)
155 if (fChildSelect.At(i) == ip) return kTRUE;
160 Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
162 // Perform kinematic selection
163 Float_t px = particle->Px();
164 Float_t py = particle->Py();
165 Float_t pz = particle->Pz();
166 Float_t e = particle->Energy();
167 Float_t pt = particle->Pt();
168 Float_t p = particle->P();
169 Float_t theta = particle->Theta();
170 Float_t mass = particle->GetMass();
171 Float_t mt2 = pt * pt + mass * mass;
173 Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px)));
176 if (TMath::Abs(pz) < e) {
177 y = 0.5*TMath::Log((e+pz)/(e-pz));
183 y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2);
185 if (TMath::Abs(y) < 1.e10) {
192 y = (pz < 0) ? -y0 : y0;
196 // Primary particle cuts
198 // transverse momentum cut
199 if (pt > fPtMax || pt < fPtMin) {
200 // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
205 if (p > fPMax || p < fPMin) {
206 // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
211 if (theta > fThetaMax || theta < fThetaMin) {
212 // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
217 if (y > fYMax || y < fYMin) {
218 // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
223 if (phi > fPhiMax || phi < fPhiMin) {
224 // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
229 // Decay product cuts
231 // transverse momentum cut
232 if (pt > fChildPtMax || pt < fChildPtMin) {
233 // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
238 if (p > fChildPMax || p < fChildPMin) {
239 // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
244 if (theta > fChildThetaMax || theta < fChildThetaMin) {
245 // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
250 if (y > fChildYMax || y < fChildYMin) {
251 // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
256 if (phi > fChildPhiMax || phi < fChildPhiMin) {
257 // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
265 Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
267 Bool_t Check ; // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance
268 Int_t NumberOfPdgCodeParticleforAcceptanceCut=0;
269 Int_t NumberOfAcceptedPdgCodeParticleforAcceptanceCut=0;
270 TParticle * particle;
272 for (i=0; i<np; i++) {
273 particle = (TParticle *) particles->At(i);
274 if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
275 NumberOfPdgCodeParticleforAcceptanceCut++;
276 if (fGeometryAcceptance->Impact(particle)) NumberOfAcceptedPdgCodeParticleforAcceptanceCut++;
279 if ( NumberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
287 Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
290 // If the particle is in a diffractive state, then take action accordingly
295 //rho_diff0 -- difficult to translate, return rho0
298 //pi_diffr+ -- change to pi+
301 //omega_di0 -- change to omega0
304 //phi_diff0 -- return phi0
307 //J/psi_di0 -- return J/psi
310 //n_diffr -- return neutron
313 //p_diffr+ -- return proton
316 //non diffractive state -- return code unchanged
320 AliGenMC& AliGenMC::operator=(const AliGenMC& rhs)
322 // Assignment operator