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[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
88cb7938 16/* $Id$ */
e36044d6 17
62d0ae06 18// Base class for generators using external MC generators.
19// For example AliGenPythia using Pythia.
20// Provides basic functionality: setting of kinematic cuts on
21// decay products and particle selection.
22// andreas.morsch@cern.ch
23
ac3faee4 24#include <TClonesArray.h>
65de9f86 25#include <TMath.h>
116cbefd 26#include <TPDGCode.h>
e36044d6 27#include <TParticle.h>
28
116cbefd 29#include "AliGenMC.h"
d97fb2bb 30#include "AliRun.h"
ac3faee4 31#include "AliGeometry.h"
116cbefd 32
198bb1c7 33ClassImp(AliGenMC)
e36044d6 34
35AliGenMC::AliGenMC()
1c56e311 36 :AliGenerator(),
969a210b 37 fParticles("TParticle", 1000),
1c56e311 38 fParentSelect(8),
39 fChildSelect(8),
40 fCutOnChild(0),
41 fChildPtMin(0.),
42 fChildPtMax(1.e10),
43 fChildPMin(0.),
44 fChildPMax(1.e10),
45 fChildPhiMin(0.),
46 fChildPhiMax(2. * TMath::Pi()),
47 fChildThetaMin(0.),
48 fChildThetaMax(TMath::Pi()),
49 fChildYMin(-12.),
50 fChildYMax(12.),
51 fXingAngleX(0.),
52 fXingAngleY(0.),
53 fForceDecay(kAll),
54 fMaxLifeTime(1.e-15),
1c56e311 55 fDyBoost(0.),
56 fGeometryAcceptance(0),
57 fPdgCodeParticleforAcceptanceCut(0),
d97fb2bb 58 fNumberOfAcceptedParticles(0),
e7c989e4 59 fNprimaries(0)
e36044d6 60{
61// Default Constructor
e7c989e4 62 fAProjectile = 1;
63 fZProjectile = 1;
64 fATarget = 1;
65 fZTarget = 1;
66 fProjectile = "P";
67 fTarget = "P";
e36044d6 68}
69
70AliGenMC::AliGenMC(Int_t npart)
1c56e311 71 :AliGenerator(npart),
ea24f998 72 fParticles("TParticle", 1000),
1c56e311 73 fParentSelect(8),
74 fChildSelect(8),
75 fCutOnChild(0),
76 fChildPtMin(0.),
77 fChildPtMax(1.e10),
78 fChildPMin(0.),
79 fChildPMax(1.e10),
80 fChildPhiMin(0.),
81 fChildPhiMax(2. * TMath::Pi()),
82 fChildThetaMin(0.),
83 fChildThetaMax(TMath::Pi()),
84 fChildYMin(-12.),
85 fChildYMax(12.),
86 fXingAngleX(0.),
87 fXingAngleY(0.),
88 fForceDecay(kAll),
89 fMaxLifeTime(1.e-15),
1c56e311 90 fDyBoost(0.),
91 fGeometryAcceptance(0),
92 fPdgCodeParticleforAcceptanceCut(0),
d97fb2bb 93 fNumberOfAcceptedParticles(0),
e7c989e4 94 fNprimaries(0)
e36044d6 95{
96// Constructor
e36044d6 97//
e7c989e4 98 fAProjectile = 1;
99 fZProjectile = 1;
100 fATarget = 1;
101 fZTarget = 1;
102 fProjectile = "P";
103 fTarget = "P";
104 for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
e36044d6 105}
106
e36044d6 107AliGenMC::~AliGenMC()
108{
109// Destructor
110}
111
112void AliGenMC::Init()
113{
114//
115// Initialization
116 switch (fForceDecay) {
e345c619 117 case kBSemiElectronic:
e36044d6 118 case kSemiElectronic:
119 case kDiElectron:
120 case kBJpsiDiElectron:
121 case kBPsiPrimeDiElectron:
47fc6bd5 122 fChildSelect[0] = kElectron;
e36044d6 123 break;
2dcb5874 124 case kHardMuons:
e345c619 125 case kBSemiMuonic:
e36044d6 126 case kSemiMuonic:
127 case kDiMuon:
128 case kBJpsiDiMuon:
129 case kBPsiPrimeDiMuon:
130 case kPiToMu:
131 case kKaToMu:
cd159249 132 case kWToMuon:
133 case kWToCharmToMuon:
2f299526 134 case kZDiMuon:
f5b581a1 135 case kZDiElectron:
e36044d6 136 fChildSelect[0]=kMuonMinus;
137 break;
cd159249 138 case kWToCharm:
139 break;
e36044d6 140 case kHadronicD:
af33df34 141 case kHadronicDWithout4Bodies:
e36044d6 142 fChildSelect[0]=kPiPlus;
143 fChildSelect[1]=kKPlus;
144 break;
00cb2f27 145 case kPhiKK:
027677ae 146 fChildSelect[0]=kKPlus;
56d47239 147 break;
148 case kBJpsi:
00935af2 149 fChildSelect[0]= 443;
56d47239 150 break;
00935af2 151 case kChiToJpsiGammaToMuonMuon:
152 fChildSelect[0]= 22;
153 fChildSelect[1]= 13;
154 break;
155 case kChiToJpsiGammaToElectronElectron:
156 fChildSelect[0]= 22;
157 fChildSelect[1]= 11;
158 break;
d3553100 159 case kLambda:
199786f7 160 fChildSelect[0]= kProton;
161 fChildSelect[1]= 211;
162 break;
163 case kOmega:
e36044d6 164 case kAll:
2b1f8257 165 case kAllMuonic:
e36044d6 166 case kNoDecay:
d5f86442 167 case kNoDecayHeavy:
1fefb2d4 168 case kNoDecayBeauty:
847af604 169 case kNeutralPion:
e36044d6 170 break;
171 }
36d770d9 172
173 if (fZTarget != 0 && fAProjectile != 0)
174 {
175 fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
176 (Double_t(fZTarget) * Double_t(fAProjectile)));
177 }
e36044d6 178}
179
180
62d0ae06 181Bool_t AliGenMC::ParentSelected(Int_t ip) const
e36044d6 182{
183// True if particle is in list of parent particles to be selected
184 for (Int_t i=0; i<8; i++)
185 {
62d0ae06 186 if (fParentSelect.At(i) == ip) return kTRUE;
e36044d6 187 }
188 return kFALSE;
189}
190
62d0ae06 191Bool_t AliGenMC::ChildSelected(Int_t ip) const
e36044d6 192{
193// True if particle is in list of decay products to be selected
194 for (Int_t i=0; i<5; i++)
195 {
62d0ae06 196 if (fChildSelect.At(i) == ip) return kTRUE;
e36044d6 197 }
198 return kFALSE;
199}
200
62d0ae06 201Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
e36044d6 202{
203// Perform kinematic selection
43a333ec 204 Double_t pz = particle->Pz();
43a333ec 205 Double_t pt = particle->Pt();
206 Double_t p = particle->P();
207 Double_t theta = particle->Theta();
208 Double_t mass = particle->GetCalcMass();
209 Double_t mt2 = pt * pt + mass * mass;
210 Double_t phi = particle->Phi();
d643e262 211 Double_t e = particle->Energy();
212
213 if (e == 0.)
214 e = TMath::Sqrt(p * p + mass * mass);
215
95450c6d 216
95450c6d 217 Double_t y, y0;
218
fef61e14 219 if (TMath::Abs(pz) < e) {
95450c6d 220 y = 0.5*TMath::Log((e+pz)/(e-pz));
221 } else {
222 y = 1.e10;
223 }
e36044d6 224
95450c6d 225 if (mt2) {
226 y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2);
e36044d6 227 } else {
95450c6d 228 if (TMath::Abs(y) < 1.e10) {
229 y0 = y;
230 } else {
231 y0 = 1.e10;
232 }
e36044d6 233 }
95450c6d 234
235 y = (pz < 0) ? -y0 : y0;
e36044d6 236
237 if (flag == 0) {
238//
239// Primary particle cuts
240//
241// transverse momentum cut
242 if (pt > fPtMax || pt < fPtMin) {
243// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
244 return kFALSE;
245 }
246//
247// momentum cut
248 if (p > fPMax || p < fPMin) {
249// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
250 return kFALSE;
251 }
252//
253// theta cut
254 if (theta > fThetaMax || theta < fThetaMin) {
255// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
256 return kFALSE;
257 }
258//
259// rapidity cut
260 if (y > fYMax || y < fYMin) {
261// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
262 return kFALSE;
263 }
264//
265// phi cut
266 if (phi > fPhiMax || phi < fPhiMin) {
267// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
268 return kFALSE;
269 }
270 } else {
271//
272// Decay product cuts
273//
274// transverse momentum cut
275 if (pt > fChildPtMax || pt < fChildPtMin) {
276// printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
277 return kFALSE;
278 }
279//
280// momentum cut
281 if (p > fChildPMax || p < fChildPMin) {
282// printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
283 return kFALSE;
284 }
285//
286// theta cut
287 if (theta > fChildThetaMax || theta < fChildThetaMin) {
288// printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
289 return kFALSE;
290 }
291//
292// rapidity cut
293 if (y > fChildYMax || y < fChildYMin) {
294// printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
295 return kFALSE;
296 }
297//
298// phi cut
299 if (phi > fChildPhiMax || phi < fChildPhiMin) {
300// printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
301 return kFALSE;
302 }
303 }
304
e36044d6 305 return kTRUE;
306}
307
65de9f86 308Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
309{
e033748b 310// Check the geometrical acceptance for particle.
311
312 Bool_t check ;
313 Int_t numberOfPdgCodeParticleforAcceptanceCut = 0;
314 Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0;
65de9f86 315 TParticle * particle;
316 Int_t i;
e033748b 317 for (i = 0; i < np; i++) {
65de9f86 318 particle = (TParticle *) particles->At(i);
319 if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
e033748b 320 numberOfPdgCodeParticleforAcceptanceCut++;
321 if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++;
65de9f86 322 }
323 }
e033748b 324 if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
325 check = kTRUE;
65de9f86 326 else
e033748b 327 check = kFALSE;
65de9f86 328
e033748b 329 return check;
65de9f86 330}
331
62d0ae06 332Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
e36044d6 333{
334//
335// If the particle is in a diffractive state, then take action accordingly
336 switch (pdgcode) {
337 case 91:
338 return 92;
339 case 110:
340 //rho_diff0 -- difficult to translate, return rho0
341 return 113;
342 case 210:
343 //pi_diffr+ -- change to pi+
344 return 211;
345 case 220:
346 //omega_di0 -- change to omega0
347 return 223;
348 case 330:
349 //phi_diff0 -- return phi0
350 return 333;
351 case 440:
352 //J/psi_di0 -- return J/psi
353 return 443;
354 case 2110:
355 //n_diffr -- return neutron
356 return 2112;
357 case 2210:
358 //p_diffr+ -- return proton
359 return 2212;
360 }
361 //non diffractive state -- return code unchanged
362 return pdgcode;
363}
3b945a60 364
36d770d9 365void AliGenMC::Boost()
3b945a60 366{
367//
368// Boost cms into LHC lab frame
369//
370
36d770d9 371 Double_t beta = TMath::TanH(fDyBoost);
60e55aee 372 Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta));
3b945a60 373 Double_t gb = gamma * beta;
374
7cdba479 375 // printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma);
3b945a60 376
377 Int_t i;
ea24f998 378 Int_t np = fParticles.GetEntriesFast();
3b945a60 379 for (i = 0; i < np; i++)
380 {
ea24f998 381 TParticle* iparticle = (TParticle*) fParticles.At(i);
3b945a60 382
383 Double_t e = iparticle->Energy();
384 Double_t px = iparticle->Px();
385 Double_t py = iparticle->Py();
386 Double_t pz = iparticle->Pz();
387
388 Double_t eb = gamma * e - gb * pz;
389 Double_t pzb = -gb * e + gamma * pz;
390
391 iparticle->SetMomentum(px, py, pzb, eb);
392 }
393}
d97fb2bb 394
395void AliGenMC::AddHeader(AliGenEventHeader* header)
396{
397 // Passes header either to the container or to gAlice
398 if (fContainer) {
399 fContainer->AddHeader(header);
400 } else {
401 gAlice->SetGenEventHeader(header);
402 }
403}