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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(),
37 fParticles(0),
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),
55 fAProjectile(1),
56 fZProjectile(1),
57 fATarget(1),
58 fZTarget(1),
59 fProjectile("P"),
60 fTarget("P"),
61 fDyBoost(0.),
62 fGeometryAcceptance(0),
63 fPdgCodeParticleforAcceptanceCut(0),
d97fb2bb 64 fNumberOfAcceptedParticles(0),
65 fNprimaries(0)
e36044d6 66{
67// Default Constructor
e36044d6 68}
69
70AliGenMC::AliGenMC(Int_t npart)
1c56e311 71 :AliGenerator(npart),
72 fParticles(0),
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),
90 fAProjectile(1),
91 fZProjectile(1),
92 fATarget(1),
93 fZTarget(1),
94 fProjectile("P"),
95 fTarget("P"),
96 fDyBoost(0.),
97 fGeometryAcceptance(0),
98 fPdgCodeParticleforAcceptanceCut(0),
d97fb2bb 99 fNumberOfAcceptedParticles(0),
100 fNprimaries(0)
e36044d6 101{
102// Constructor
e36044d6 103//
e36044d6 104 for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
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;
159
62d0ae06 160 case kOmega:
e36044d6 161 case kAll:
2b1f8257 162 case kAllMuonic:
e36044d6 163 case kNoDecay:
d5f86442 164 case kNoDecayHeavy:
847af604 165 case kNeutralPion:
e36044d6 166 break;
167 }
36d770d9 168
169 if (fZTarget != 0 && fAProjectile != 0)
170 {
171 fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
172 (Double_t(fZTarget) * Double_t(fAProjectile)));
173 }
e36044d6 174}
175
176
62d0ae06 177Bool_t AliGenMC::ParentSelected(Int_t ip) const
e36044d6 178{
179// True if particle is in list of parent particles to be selected
180 for (Int_t i=0; i<8; i++)
181 {
62d0ae06 182 if (fParentSelect.At(i) == ip) return kTRUE;
e36044d6 183 }
184 return kFALSE;
185}
186
62d0ae06 187Bool_t AliGenMC::ChildSelected(Int_t ip) const
e36044d6 188{
189// True if particle is in list of decay products to be selected
190 for (Int_t i=0; i<5; i++)
191 {
62d0ae06 192 if (fChildSelect.At(i) == ip) return kTRUE;
e36044d6 193 }
194 return kFALSE;
195}
196
62d0ae06 197Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
e36044d6 198{
199// Perform kinematic selection
43a333ec 200 Double_t pz = particle->Pz();
201 Double_t e = particle->Energy();
202 Double_t pt = particle->Pt();
203 Double_t p = particle->P();
204 Double_t theta = particle->Theta();
205 Double_t mass = particle->GetCalcMass();
206 Double_t mt2 = pt * pt + mass * mass;
207 Double_t phi = particle->Phi();
95450c6d 208
95450c6d 209 Double_t y, y0;
210
fef61e14 211 if (TMath::Abs(pz) < e) {
95450c6d 212 y = 0.5*TMath::Log((e+pz)/(e-pz));
213 } else {
214 y = 1.e10;
215 }
e36044d6 216
95450c6d 217 if (mt2) {
218 y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2);
e36044d6 219 } else {
95450c6d 220 if (TMath::Abs(y) < 1.e10) {
221 y0 = y;
222 } else {
223 y0 = 1.e10;
224 }
e36044d6 225 }
95450c6d 226
227 y = (pz < 0) ? -y0 : y0;
e36044d6 228
229 if (flag == 0) {
230//
231// Primary particle cuts
232//
233// transverse momentum cut
234 if (pt > fPtMax || pt < fPtMin) {
235// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
236 return kFALSE;
237 }
238//
239// momentum cut
240 if (p > fPMax || p < fPMin) {
241// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
242 return kFALSE;
243 }
244//
245// theta cut
246 if (theta > fThetaMax || theta < fThetaMin) {
247// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
248 return kFALSE;
249 }
250//
251// rapidity cut
252 if (y > fYMax || y < fYMin) {
253// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
254 return kFALSE;
255 }
256//
257// phi cut
258 if (phi > fPhiMax || phi < fPhiMin) {
259// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
260 return kFALSE;
261 }
262 } else {
263//
264// Decay product cuts
265//
266// transverse momentum cut
267 if (pt > fChildPtMax || pt < fChildPtMin) {
268// printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
269 return kFALSE;
270 }
271//
272// momentum cut
273 if (p > fChildPMax || p < fChildPMin) {
274// printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
275 return kFALSE;
276 }
277//
278// theta cut
279 if (theta > fChildThetaMax || theta < fChildThetaMin) {
280// printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
281 return kFALSE;
282 }
283//
284// rapidity cut
285 if (y > fChildYMax || y < fChildYMin) {
286// printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
287 return kFALSE;
288 }
289//
290// phi cut
291 if (phi > fChildPhiMax || phi < fChildPhiMin) {
292// printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
293 return kFALSE;
294 }
295 }
296
e36044d6 297 return kTRUE;
298}
299
65de9f86 300Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
301{
e033748b 302// Check the geometrical acceptance for particle.
303
304 Bool_t check ;
305 Int_t numberOfPdgCodeParticleforAcceptanceCut = 0;
306 Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0;
65de9f86 307 TParticle * particle;
308 Int_t i;
e033748b 309 for (i = 0; i < np; i++) {
65de9f86 310 particle = (TParticle *) particles->At(i);
311 if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
e033748b 312 numberOfPdgCodeParticleforAcceptanceCut++;
313 if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++;
65de9f86 314 }
315 }
e033748b 316 if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
317 check = kTRUE;
65de9f86 318 else
e033748b 319 check = kFALSE;
65de9f86 320
e033748b 321 return check;
65de9f86 322}
323
62d0ae06 324Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
e36044d6 325{
326//
327// If the particle is in a diffractive state, then take action accordingly
328 switch (pdgcode) {
329 case 91:
330 return 92;
331 case 110:
332 //rho_diff0 -- difficult to translate, return rho0
333 return 113;
334 case 210:
335 //pi_diffr+ -- change to pi+
336 return 211;
337 case 220:
338 //omega_di0 -- change to omega0
339 return 223;
340 case 330:
341 //phi_diff0 -- return phi0
342 return 333;
343 case 440:
344 //J/psi_di0 -- return J/psi
345 return 443;
346 case 2110:
347 //n_diffr -- return neutron
348 return 2112;
349 case 2210:
350 //p_diffr+ -- return proton
351 return 2212;
352 }
353 //non diffractive state -- return code unchanged
354 return pdgcode;
355}
3b945a60 356
36d770d9 357void AliGenMC::Boost()
3b945a60 358{
359//
360// Boost cms into LHC lab frame
361//
362
36d770d9 363 Double_t beta = TMath::TanH(fDyBoost);
3b945a60 364 Double_t gamma = 1./TMath::Sqrt(1.-beta*beta);
365 Double_t gb = gamma * beta;
366
7cdba479 367 // printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma);
3b945a60 368
369 Int_t i;
370 Int_t np = fParticles->GetEntriesFast();
371 for (i = 0; i < np; i++)
372 {
373 TParticle* iparticle = (TParticle*) fParticles->At(i);
374
375 Double_t e = iparticle->Energy();
376 Double_t px = iparticle->Px();
377 Double_t py = iparticle->Py();
378 Double_t pz = iparticle->Pz();
379
380 Double_t eb = gamma * e - gb * pz;
381 Double_t pzb = -gb * e + gamma * pz;
382
383 iparticle->SetMomentum(px, py, pzb, eb);
384 }
385}
d97fb2bb 386
387void AliGenMC::AddHeader(AliGenEventHeader* header)
388{
389 // Passes header either to the container or to gAlice
390 if (fContainer) {
391 fContainer->AddHeader(header);
392 } else {
393 gAlice->SetGenEventHeader(header);
394 }
395}