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