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New class used for primary vertex finding (AliITSVertexerTracks)
[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$Log$
116cbefd 18Revision 1.13 2002/10/14 14:55:35 hristov
19Merging the VirtualMC branch to the main development branch (HEAD)
20
b9d0a01d 21Revision 1.5.4.2 2002/07/24 08:56:28 alibrary
22Updating EVGEN on TVirtulaMC
23
24Revision 1.12 2002/07/19 11:42:33 morsch
25Use CalcMass()
26
cf01ee36 27Revision 1.11 2002/06/06 15:26:24 morsch
28Correct child-selection for kPhiKK
29
027677ae 30Revision 1.10 2002/06/05 14:05:46 morsch
31Decayer option kPhiKK for forced phi->K+K- decay added.
32
00cb2f27 33Revision 1.9 2002/05/30 14:58:29 morsch
34Add pointer to AliGeometry to handle geometrical acceptance. (G. MArtinez)
35
65de9f86 36Revision 1.8 2002/04/26 10:42:35 morsch
37Case kNoDecayHeavy added. (N. Carrer)
38
d5f86442 39Revision 1.7 2002/04/17 10:32:32 morsch
40Coding Rule violations corrected.
41
62d0ae06 42Revision 1.6 2002/03/26 14:19:36 morsch
43Saver calculation of rapdity.
44
fef61e14 45Revision 1.5 2002/03/12 17:02:20 morsch
46Change in calculation of rapidity, include case in which numerically e == pz.
47
95450c6d 48Revision 1.4 2001/11/27 13:13:07 morsch
49Maximum lifetime for long-lived particles to be put on the stack is parameter.
50It can be set via SetMaximumLifetime(..).
51
47fc6bd5 52Revision 1.3 2001/10/16 08:48:56 morsch
53Common vertex related code moved to base class AliGenerator.
54
b80a8e41 55Revision 1.2 2001/10/15 08:15:51 morsch
56Event vertex and vertex truncation setting moved into AliMC.
57
dba8ac91 58Revision 1.1 2001/07/13 10:56:00 morsch
59AliGenMC base class for AliGenParam and AliGenPythia commonalities.
60
e36044d6 61*/
62
62d0ae06 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
68
65de9f86 69#include <TMath.h>
116cbefd 70#include <TPDGCode.h>
e36044d6 71#include <TParticle.h>
72
116cbefd 73#include "AliGenMC.h"
74
e36044d6 75 ClassImp(AliGenMC)
76
77AliGenMC::AliGenMC()
78 :AliGenerator()
79{
80// Default Constructor
81 SetCutOnChild();
82 SetChildMomentumRange();
83 SetChildPtRange();
84 SetChildPhiRange();
85 SetChildThetaRange();
86 SetChildYRange();
47fc6bd5 87 SetMaximumLifetime();
65de9f86 88 SetGeometryAcceptance();
89 SetPdgCodeParticleforAcceptanceCut();
90 SetNumberOfAcceptedParticles();
e36044d6 91}
92
93AliGenMC::AliGenMC(Int_t npart)
94 :AliGenerator(npart)
95{
96// Constructor
97 SetCutOnChild();
98 SetChildMomentumRange();
99 SetChildPtRange();
100 SetChildPhiRange();
101 SetChildThetaRange();
102 SetChildYRange();
103//
104 fParentSelect.Set(8);
105 fChildSelect.Set(8);
106 for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
47fc6bd5 107 SetMaximumLifetime();
65de9f86 108 SetGeometryAcceptance();
109 SetPdgCodeParticleforAcceptanceCut();
110 SetNumberOfAcceptedParticles();
e36044d6 111}
112
113AliGenMC::AliGenMC(const AliGenMC & mc)
114{
115// copy constructor
116}
117
118AliGenMC::~AliGenMC()
119{
120// Destructor
121}
122
123void AliGenMC::Init()
124{
125//
126// Initialization
127 switch (fForceDecay) {
128 case kSemiElectronic:
129 case kDiElectron:
130 case kBJpsiDiElectron:
131 case kBPsiPrimeDiElectron:
47fc6bd5 132 fChildSelect[0] = kElectron;
e36044d6 133 break;
134 case kSemiMuonic:
135 case kDiMuon:
136 case kBJpsiDiMuon:
137 case kBPsiPrimeDiMuon:
138 case kPiToMu:
139 case kKaToMu:
140 fChildSelect[0]=kMuonMinus;
141 break;
142 case kHadronicD:
143 fChildSelect[0]=kPiPlus;
144 fChildSelect[1]=kKPlus;
145 break;
00cb2f27 146 case kPhiKK:
027677ae 147 fChildSelect[0]=kKPlus;
62d0ae06 148 case kOmega:
e36044d6 149 case kAll:
150 case kNoDecay:
d5f86442 151 case kNoDecayHeavy:
e36044d6 152 break;
153 }
154}
155
156
62d0ae06 157Bool_t AliGenMC::ParentSelected(Int_t ip) const
e36044d6 158{
159// True if particle is in list of parent particles to be selected
160 for (Int_t i=0; i<8; i++)
161 {
62d0ae06 162 if (fParentSelect.At(i) == ip) return kTRUE;
e36044d6 163 }
164 return kFALSE;
165}
166
62d0ae06 167Bool_t AliGenMC::ChildSelected(Int_t ip) const
e36044d6 168{
169// True if particle is in list of decay products to be selected
170 for (Int_t i=0; i<5; i++)
171 {
62d0ae06 172 if (fChildSelect.At(i) == ip) return kTRUE;
e36044d6 173 }
174 return kFALSE;
175}
176
62d0ae06 177Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
e36044d6 178{
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();
cf01ee36 187 Float_t mass = particle->GetCalcMass();
95450c6d 188 Float_t mt2 = pt * pt + mass * mass;
189
e36044d6 190 Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px)));
95450c6d 191 Double_t y, y0;
192
fef61e14 193 if (TMath::Abs(pz) < e) {
95450c6d 194 y = 0.5*TMath::Log((e+pz)/(e-pz));
195 } else {
196 y = 1.e10;
197 }
e36044d6 198
95450c6d 199 if (mt2) {
200 y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2);
e36044d6 201 } else {
95450c6d 202 if (TMath::Abs(y) < 1.e10) {
203 y0 = y;
204 } else {
205 y0 = 1.e10;
206 }
e36044d6 207 }
95450c6d 208
209 y = (pz < 0) ? -y0 : y0;
e36044d6 210
211 if (flag == 0) {
212//
213// Primary particle cuts
214//
215// transverse momentum cut
216 if (pt > fPtMax || pt < fPtMin) {
217// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
218 return kFALSE;
219 }
220//
221// momentum cut
222 if (p > fPMax || p < fPMin) {
223// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
224 return kFALSE;
225 }
226//
227// theta cut
228 if (theta > fThetaMax || theta < fThetaMin) {
229// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
230 return kFALSE;
231 }
232//
233// rapidity cut
234 if (y > fYMax || y < fYMin) {
235// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
236 return kFALSE;
237 }
238//
239// phi cut
240 if (phi > fPhiMax || phi < fPhiMin) {
241// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
242 return kFALSE;
243 }
244 } else {
245//
246// Decay product cuts
247//
248// transverse momentum cut
249 if (pt > fChildPtMax || pt < fChildPtMin) {
250// printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
251 return kFALSE;
252 }
253//
254// momentum cut
255 if (p > fChildPMax || p < fChildPMin) {
256// printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
257 return kFALSE;
258 }
259//
260// theta cut
261 if (theta > fChildThetaMax || theta < fChildThetaMin) {
262// printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
263 return kFALSE;
264 }
265//
266// rapidity cut
267 if (y > fChildYMax || y < fChildYMin) {
268// printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
269 return kFALSE;
270 }
271//
272// phi cut
273 if (phi > fChildPhiMax || phi < fChildPhiMin) {
274// printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
275 return kFALSE;
276 }
277 }
278
e36044d6 279 return kTRUE;
280}
281
65de9f86 282Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
283{
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;
288 Int_t i;
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++;
294 }
295 }
296 if ( NumberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
297 Check = kTRUE;
298 else
299 Check = kFALSE;
300
301 return Check;
302}
303
62d0ae06 304Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
e36044d6 305{
306//
307// If the particle is in a diffractive state, then take action accordingly
308 switch (pdgcode) {
309 case 91:
310 return 92;
311 case 110:
312 //rho_diff0 -- difficult to translate, return rho0
313 return 113;
314 case 210:
315 //pi_diffr+ -- change to pi+
316 return 211;
317 case 220:
318 //omega_di0 -- change to omega0
319 return 223;
320 case 330:
321 //phi_diff0 -- return phi0
322 return 333;
323 case 440:
324 //J/psi_di0 -- return J/psi
325 return 443;
326 case 2110:
327 //n_diffr -- return neutron
328 return 2112;
329 case 2210:
330 //p_diffr+ -- return proton
331 return 2212;
332 }
333 //non diffractive state -- return code unchanged
334 return pdgcode;
335}
336
337AliGenMC& AliGenMC::operator=(const AliGenMC& rhs)
338{
339// Assignment operator
340 return *this;
341}
342