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 1.13 2002/10/14 14:55:35 hristov
19 Merging the VirtualMC branch to the main development branch (HEAD)
21 Revision 1.5.4.2 2002/07/24 08:56:28 alibrary
22 Updating EVGEN on TVirtulaMC
24 Revision 1.12 2002/07/19 11:42:33 morsch
27 Revision 1.11 2002/06/06 15:26:24 morsch
28 Correct child-selection for kPhiKK
30 Revision 1.10 2002/06/05 14:05:46 morsch
31 Decayer option kPhiKK for forced phi->K+K- decay added.
33 Revision 1.9 2002/05/30 14:58:29 morsch
34 Add pointer to AliGeometry to handle geometrical acceptance. (G. MArtinez)
36 Revision 1.8 2002/04/26 10:42:35 morsch
37 Case kNoDecayHeavy added. (N. Carrer)
39 Revision 1.7 2002/04/17 10:32:32 morsch
40 Coding Rule violations corrected.
42 Revision 1.6 2002/03/26 14:19:36 morsch
43 Saver calculation of rapdity.
45 Revision 1.5 2002/03/12 17:02:20 morsch
46 Change in calculation of rapidity, include case in which numerically e == pz.
48 Revision 1.4 2001/11/27 13:13:07 morsch
49 Maximum lifetime for long-lived particles to be put on the stack is parameter.
50 It can be set via SetMaximumLifetime(..).
52 Revision 1.3 2001/10/16 08:48:56 morsch
53 Common vertex related code moved to base class AliGenerator.
55 Revision 1.2 2001/10/15 08:15:51 morsch
56 Event vertex and vertex truncation setting moved into AliMC.
58 Revision 1.1 2001/07/13 10:56:00 morsch
59 AliGenMC base class for AliGenParam and AliGenPythia commonalities.
63 // Base class for generators using external MC generators.
64 // For example AliGenPythia using Pythia.
65 // Provides basic functionality: setting of kinematic cuts on
66 // decay products and particle selection.
67 // andreas.morsch@cern.ch
71 #include <TParticle.h>
80 // Default Constructor
82 SetChildMomentumRange();
88 SetGeometryAcceptance();
89 SetPdgCodeParticleforAcceptanceCut();
90 SetNumberOfAcceptedParticles();
93 AliGenMC::AliGenMC(Int_t npart)
98 SetChildMomentumRange();
101 SetChildThetaRange();
104 fParentSelect.Set(8);
106 for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
107 SetMaximumLifetime();
108 SetGeometryAcceptance();
109 SetPdgCodeParticleforAcceptanceCut();
110 SetNumberOfAcceptedParticles();
113 AliGenMC::AliGenMC(const AliGenMC & mc)
118 AliGenMC::~AliGenMC()
123 void AliGenMC::Init()
127 switch (fForceDecay) {
128 case kSemiElectronic:
130 case kBJpsiDiElectron:
131 case kBPsiPrimeDiElectron:
132 fChildSelect[0] = kElectron;
137 case kBPsiPrimeDiMuon:
140 fChildSelect[0]=kMuonMinus;
143 fChildSelect[0]=kPiPlus;
144 fChildSelect[1]=kKPlus;
147 fChildSelect[0]=kKPlus;
157 Bool_t AliGenMC::ParentSelected(Int_t ip) const
159 // True if particle is in list of parent particles to be selected
160 for (Int_t i=0; i<8; i++)
162 if (fParentSelect.At(i) == ip) return kTRUE;
167 Bool_t AliGenMC::ChildSelected(Int_t ip) const
169 // True if particle is in list of decay products to be selected
170 for (Int_t i=0; i<5; i++)
172 if (fChildSelect.At(i) == ip) return kTRUE;
177 Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
179 // Perform kinematic selection
180 Float_t px = particle->Px();
181 Float_t py = particle->Py();
182 Float_t pz = particle->Pz();
183 Float_t e = particle->Energy();
184 Float_t pt = particle->Pt();
185 Float_t p = particle->P();
186 Float_t theta = particle->Theta();
187 Float_t mass = particle->GetCalcMass();
188 Float_t mt2 = pt * pt + mass * mass;
190 Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px)));
193 if (TMath::Abs(pz) < e) {
194 y = 0.5*TMath::Log((e+pz)/(e-pz));
200 y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2);
202 if (TMath::Abs(y) < 1.e10) {
209 y = (pz < 0) ? -y0 : y0;
213 // Primary particle cuts
215 // transverse momentum cut
216 if (pt > fPtMax || pt < fPtMin) {
217 // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
222 if (p > fPMax || p < fPMin) {
223 // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
228 if (theta > fThetaMax || theta < fThetaMin) {
229 // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
234 if (y > fYMax || y < fYMin) {
235 // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
240 if (phi > fPhiMax || phi < fPhiMin) {
241 // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
246 // Decay product cuts
248 // transverse momentum cut
249 if (pt > fChildPtMax || pt < fChildPtMin) {
250 // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
255 if (p > fChildPMax || p < fChildPMin) {
256 // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
261 if (theta > fChildThetaMax || theta < fChildThetaMin) {
262 // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
267 if (y > fChildYMax || y < fChildYMin) {
268 // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
273 if (phi > fChildPhiMax || phi < fChildPhiMin) {
274 // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
282 Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
284 Bool_t Check ; // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance
285 Int_t NumberOfPdgCodeParticleforAcceptanceCut=0;
286 Int_t NumberOfAcceptedPdgCodeParticleforAcceptanceCut=0;
287 TParticle * particle;
289 for (i=0; i<np; i++) {
290 particle = (TParticle *) particles->At(i);
291 if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
292 NumberOfPdgCodeParticleforAcceptanceCut++;
293 if (fGeometryAcceptance->Impact(particle)) NumberOfAcceptedPdgCodeParticleforAcceptanceCut++;
296 if ( NumberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
304 Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
307 // If the particle is in a diffractive state, then take action accordingly
312 //rho_diff0 -- difficult to translate, return rho0
315 //pi_diffr+ -- change to pi+
318 //omega_di0 -- change to omega0
321 //phi_diff0 -- return phi0
324 //J/psi_di0 -- return J/psi
327 //n_diffr -- return neutron
330 //p_diffr+ -- return proton
333 //non diffractive state -- return code unchanged
337 AliGenMC& AliGenMC::operator=(const AliGenMC& rhs)
339 // Assignment operator