[u/mrichter/AliRoot.git] / EVGEN / AliGenMC.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

// Base class for generators using external MC generators.
// For example AliGenPythia using Pythia.
// Provides basic functionality: setting of kinematic cuts on 
// decay products and particle selection.
// andreas.morsch@cern.ch

#include <TClonesArray.h>
#include <TMath.h>
#include <TPDGCode.h>
#include <TParticle.h>
#include <TLorentzVector.h>
#include <TVector3.h>

#include "AliGenMC.h"
#include "AliRun.h"
#include "AliGeometry.h"

ClassImp(AliGenMC)

AliGenMC::AliGenMC()
    :AliGenerator(),
     fParticles("TParticle", 1000),
     fParentSelect(8),
     fChildSelect(8),
     fCutOnChild(0),
     fChildPtMin(0.),
     fChildPtMax(1.e10),
     fChildPMin(0.),
     fChildPMax(1.e10),
     fChildPhiMin(0.),
     fChildPhiMax(2. * TMath::Pi()),
     fChildThetaMin(0.),
     fChildThetaMax(TMath::Pi()),
     fChildYMin(-12.),
     fChildYMax(12.),
     fXingAngleX(0.),
     fXingAngleY(0.),
     fForceDecay(kAll),
     fMaxLifeTime(1.e-15),
     fDyBoost(0.),
     fGeometryAcceptance(0),
     fPdgCodeParticleforAcceptanceCut(0),
     fNumberOfAcceptedParticles(0),
     fNprimaries(0)
{
// Default Constructor
  fAProjectile = 1;
  fZProjectile = 1;
  fATarget = 1;
  fZTarget = 1;
  fProjectile = "P";
  fTarget = "P";
}

AliGenMC::AliGenMC(Int_t npart)
    :AliGenerator(npart),
     fParticles("TParticle", 1000),
     fParentSelect(8),
     fChildSelect(8),
     fCutOnChild(0),
     fChildPtMin(0.),
     fChildPtMax(1.e10),
     fChildPMin(0.),
     fChildPMax(1.e10),
     fChildPhiMin(0.),
     fChildPhiMax(2. * TMath::Pi()),
     fChildThetaMin(0.),
     fChildThetaMax(TMath::Pi()),
     fChildYMin(-12.),
     fChildYMax(12.),
     fXingAngleX(0.),
     fXingAngleY(0.),
     fForceDecay(kAll),
     fMaxLifeTime(1.e-15),
     fDyBoost(0.),
     fGeometryAcceptance(0),
     fPdgCodeParticleforAcceptanceCut(0),
     fNumberOfAcceptedParticles(0),
     fNprimaries(0)
{
//  Constructor
// 
  fAProjectile = 1;
  fZProjectile = 1;
  fATarget = 1;
  fZTarget = 1;
  fProjectile = "P";
  fTarget = "P";
  for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
}

AliGenMC::~AliGenMC()
{
// Destructor
}

void AliGenMC::Init()
{
//
//  Initialization
    switch (fForceDecay) {
    case kBSemiElectronic:
    case kSemiElectronic:
    case kDiElectron:
    case kBJpsiDiElectron:
    case kBPsiPrimeDiElectron:
	fChildSelect[0] = kElectron;	
	break;
    case kHardMuons:	
    case kBSemiMuonic:
    case kSemiMuonic:
    case kDiMuon:
    case kBJpsiDiMuon:
    case kBPsiPrimeDiMuon:
    case kPiToMu:
    case kKaToMu:
    case kWToMuon:
    case kWToCharmToMuon:
    case kZDiMuon:
    case kZDiElectron:
	fChildSelect[0]=kMuonMinus;
	break;
    case kWToCharm:
	break;
    case kHadronicD:
    case kHadronicDWithout4Bodies:
	fChildSelect[0]=kPiPlus;
	fChildSelect[1]=kKPlus;
	break;
    case kPhiKK:
	fChildSelect[0]=kKPlus;
	break;
    case kBJpsi:
	fChildSelect[0]= 443;
	break;
   case kChiToJpsiGammaToMuonMuon:
        fChildSelect[0]= 22;
        fChildSelect[1]= 13;
        break;
    case kChiToJpsiGammaToElectronElectron:
        fChildSelect[0]= 22;
        fChildSelect[1]= 11;
        break;
    case kLambda:	
	fChildSelect[0]= kProton;
        fChildSelect[1]= 211;
	break;
    case kOmega:
    case kAll:
    case kAllMuonic:
    case kNoDecay:
    case kNoDecayHeavy:
    case kNoDecayBeauty:
    case kNeutralPion:
	break;
    }

    if (fZTarget != 0 && fAProjectile != 0) 
    {
	fDyBoost    = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) / 
					 (Double_t(fZTarget)    * Double_t(fAProjectile)));
    }
}


Bool_t AliGenMC::ParentSelected(Int_t ip) const
{
// True if particle is in list of parent particles to be selected
    for (Int_t i=0; i<8; i++)
    {
	if (fParentSelect.At(i) == ip) return kTRUE;
    }
    return kFALSE;
}

Bool_t AliGenMC::ChildSelected(Int_t ip) const
{
// True if particle is in list of decay products to be selected
    for (Int_t i=0; i<5; i++)
    {
	if (fChildSelect.At(i) == ip) return kTRUE;
    }
    return kFALSE;
}

Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
{
// Perform kinematic selection
    Double_t pz    = particle->Pz();
    Double_t pt    = particle->Pt();
    Double_t p     = particle->P();
    Double_t theta = particle->Theta();
    Double_t mass  = particle->GetCalcMass();
    Double_t mt2   = pt * pt + mass * mass;
    Double_t phi   = particle->Phi();
    Double_t e     = particle->Energy();
    
    if (e == 0.)     
	e = TMath::Sqrt(p * p + mass * mass);

    
    Double_t y, y0;

    if (TMath::Abs(pz) <  e) {
	y = 0.5*TMath::Log((e+pz)/(e-pz));
    } else {
	y = 1.e10;
    }
    
    if (mt2) {
	y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2);
    } else {
	if (TMath::Abs(y) < 1.e10) {
	    y0 = y;
	} else {
	    y0 = 1.e10;
	}
    }
      
    y = (pz < 0) ? -y0 : y0;
    
    if (flag == 0) {
//
// Primary particle cuts
//
//  transverse momentum cut    
	if (pt > fPtMax || pt < fPtMin) {
//	    printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
	    return kFALSE;
	}
//
// momentum cut
	if (p > fPMax || p < fPMin) {
//	    printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	    return kFALSE;
	}
//
// theta cut
	if (theta > fThetaMax || theta < fThetaMin) {
//	    printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	    return kFALSE;
	}
//
// rapidity cut
	if (y > fYMax || y < fYMin) {
//	    printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
	    return kFALSE;
	}
//
// phi cut
	if (phi > fPhiMax || phi < fPhiMin) {
//	    printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
	    return kFALSE;
	}
    } else {
//
// Decay product cuts
//
//  transverse momentum cut    
	if (pt > fChildPtMax || pt < fChildPtMin) {
//	    printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
	    return kFALSE;
	}
//
// momentum cut
	if (p > fChildPMax || p < fChildPMin) {
//	    printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
	    return kFALSE;
	}
//
// theta cut
	if (theta > fChildThetaMax || theta < fChildThetaMin) {
//	    printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
	    return kFALSE;
	}
//
// rapidity cut
	if (y > fChildYMax || y < fChildYMin) {
//	    printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
	    return kFALSE;
	}
//
// phi cut
	if (phi > fChildPhiMax || phi < fChildPhiMin) {
//	    printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
	    return kFALSE;
	}
    }
    
    return kTRUE;
}

Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
{
// Check the geometrical acceptance for particle.

  Bool_t check ;  
  Int_t numberOfPdgCodeParticleforAcceptanceCut = 0;
  Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0;
  TParticle * particle;
  Int_t i;
  for (i = 0; i < np; i++) {
    particle =  (TParticle *) particles->At(i);
    if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
      numberOfPdgCodeParticleforAcceptanceCut++;
      if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++;
    }   
  }
  if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
    check = kTRUE;
  else
    check = kFALSE;

  return check;
}

Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
{
//
//  If the particle is in a diffractive state, then take action accordingly
  switch (pdgcode) {
  case 91:
    return 92;
  case 110:
    //rho_diff0 -- difficult to translate, return rho0
    return 113;
  case 210:
    //pi_diffr+ -- change to pi+
    return 211;
  case 220:
    //omega_di0 -- change to omega0
    return 223;
  case 330:
    //phi_diff0 -- return phi0
    return 333;
  case 440:
    //J/psi_di0 -- return J/psi
    return 443;
  case 2110:
    //n_diffr -- return neutron
    return 2112;
  case 2210:
    //p_diffr+ -- return proton
    return 2212;
  }
  //non diffractive state -- return code unchanged
  return pdgcode;
}

void AliGenMC::Boost()
{
//
// Boost cms into LHC lab frame
//

    Double_t beta  = TMath::TanH(fDyBoost);
    Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta));
    Double_t gb    = gamma * beta;

    //    printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma);
    
    Int_t i;
    Int_t np = fParticles.GetEntriesFast();
    for (i = 0; i < np; i++) 
    {
	TParticle* iparticle = (TParticle*) fParticles.At(i);

	Double_t e   = iparticle->Energy();
	Double_t px  = iparticle->Px();
	Double_t py  = iparticle->Py();
	Double_t pz  = iparticle->Pz();

	Double_t eb  = gamma * e -      gb * pz;
	Double_t pzb =   -gb * e +   gamma * pz;

	iparticle->SetMomentum(px, py, pzb, eb);
    }
}

void AliGenMC::BeamCrossAngle()
{
  // Applies a boost in the y-direction in order to take into account the 
  // beam crossing angle

  Double_t thetaPr0, phiPr0, pyPr2, pzPr2;
  TVector3 beta;
  
  thetaPr0 = fXingAngleY / 2.;
  phiPr0 = 0;

  // Momentum of the CMS system
  pyPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Sin(thetaPr0); 
  pzPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Cos(thetaPr0);

  TLorentzVector proj1Vect, proj2Vect, projVect;
  proj1Vect.SetPxPyPzE(0., pyPr2, pzPr2, fEnergyCMS/2);
  proj2Vect.SetPxPyPzE(0., pyPr2,-pzPr2, fEnergyCMS/2);
  projVect = proj1Vect + proj2Vect;
  beta=(1. / projVect.E()) * (projVect.Vect());

  Int_t i;
  Int_t np = fParticles.GetEntriesFast();
  for (i = 0; i < np; i++) 
    {
      TParticle* iparticle = (TParticle*) fParticles.At(i);

      Double_t e   = iparticle->Energy();
      Double_t px  = iparticle->Px();
      Double_t py  = iparticle->Py();
      Double_t pz  = iparticle->Pz();
      
      TLorentzVector partIn;
      partIn.SetPxPyPzE(px,py,pz,e);
      partIn.Boost(beta);
      iparticle->SetMomentum(partIn.Px(),partIn.Py(),partIn.Pz(),partIn.E());
    }
}


void AliGenMC::AddHeader(AliGenEventHeader* header)
{
    // Passes header either to the container or to gAlice
    if (fContainer) {
	fContainer->AddHeader(header);
    } else {
	gAlice->SetGenEventHeader(header);	
    }
}
Commit	Line	Data
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>
7eb751fe	28	#include <TLorentzVector.h>
7eb751fe	29	#include <TVector3.h>
e36044d6	30
116cbefd	31	#include "AliGenMC.h"
d97fb2bb	32	#include "AliRun.h"
ac3faee4	33	#include "AliGeometry.h"
116cbefd	34
198bb1c7	35	ClassImp(AliGenMC)
e36044d6	36
e36044d6	37	AliGenMC::AliGenMC()
1c56e311	38	:AliGenerator(),
969a210b	39	fParticles("TParticle", 1000),
1c56e311	40	fParentSelect(8),
	41	fChildSelect(8),
	42	fCutOnChild(0),
	43	fChildPtMin(0.),
	44	fChildPtMax(1.e10),
	45	fChildPMin(0.),
	46	fChildPMax(1.e10),
	47	fChildPhiMin(0.),
	48	fChildPhiMax(2. * TMath::Pi()),
	49	fChildThetaMin(0.),
	50	fChildThetaMax(TMath::Pi()),
	51	fChildYMin(-12.),
	52	fChildYMax(12.),
	53	fXingAngleX(0.),
	54	fXingAngleY(0.),
	55	fForceDecay(kAll),
	56	fMaxLifeTime(1.e-15),
1c56e311	57	fDyBoost(0.),
	58	fGeometryAcceptance(0),
	59	fPdgCodeParticleforAcceptanceCut(0),
d97fb2bb	60	fNumberOfAcceptedParticles(0),
e7c989e4	61	fNprimaries(0)
e36044d6	62	{
e36044d6	63	// Default Constructor
e7c989e4	64	fAProjectile = 1;
	65	fZProjectile = 1;
	66	fATarget = 1;
	67	fZTarget = 1;
	68	fProjectile = "P";
	69	fTarget = "P";
e36044d6	70	}
	71
	72	AliGenMC::AliGenMC(Int_t npart)
1c56e311	73	:AliGenerator(npart),
ea24f998	74	fParticles("TParticle", 1000),
1c56e311	75	fParentSelect(8),
	76	fChildSelect(8),
	77	fCutOnChild(0),
	78	fChildPtMin(0.),
	79	fChildPtMax(1.e10),
	80	fChildPMin(0.),
	81	fChildPMax(1.e10),
	82	fChildPhiMin(0.),
	83	fChildPhiMax(2. * TMath::Pi()),
	84	fChildThetaMin(0.),
	85	fChildThetaMax(TMath::Pi()),
	86	fChildYMin(-12.),
	87	fChildYMax(12.),
	88	fXingAngleX(0.),
	89	fXingAngleY(0.),
	90	fForceDecay(kAll),
	91	fMaxLifeTime(1.e-15),
1c56e311	92	fDyBoost(0.),
	93	fGeometryAcceptance(0),
	94	fPdgCodeParticleforAcceptanceCut(0),
d97fb2bb	95	fNumberOfAcceptedParticles(0),
e7c989e4	96	fNprimaries(0)
e36044d6	97	{
e36044d6	98	// Constructor
e36044d6	99	//
e7c989e4	100	fAProjectile = 1;
	101	fZProjectile = 1;
	102	fATarget = 1;
	103	fZTarget = 1;
	104	fProjectile = "P";
	105	fTarget = "P";
	106	for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
e36044d6	107	}
e36044d6	108
e36044d6	109	AliGenMC::~AliGenMC()
	110	{
	111	// Destructor
	112	}
	113
	114	void AliGenMC::Init()
	115	{
	116	//
	117	// Initialization
	118	switch (fForceDecay) {
e345c619	119	case kBSemiElectronic:
e36044d6	120	case kSemiElectronic:
	121	case kDiElectron:
	122	case kBJpsiDiElectron:
	123	case kBPsiPrimeDiElectron:
47fc6bd5	124	fChildSelect[0] = kElectron;
e36044d6	125	break;
2dcb5874	126	case kHardMuons:
e345c619	127	case kBSemiMuonic:
e36044d6	128	case kSemiMuonic:
	129	case kDiMuon:
	130	case kBJpsiDiMuon:
	131	case kBPsiPrimeDiMuon:
	132	case kPiToMu:
	133	case kKaToMu:
cd159249	134	case kWToMuon:
cd159249	135	case kWToCharmToMuon:
2f299526	136	case kZDiMuon:
f5b581a1	137	case kZDiElectron:
e36044d6	138	fChildSelect[0]=kMuonMinus;
e36044d6	139	break;
cd159249	140	case kWToCharm:
cd159249	141	break;
e36044d6	142	case kHadronicD:
af33df34	143	case kHadronicDWithout4Bodies:
e36044d6	144	fChildSelect[0]=kPiPlus;
	145	fChildSelect[1]=kKPlus;
	146	break;
00cb2f27	147	case kPhiKK:
027677ae	148	fChildSelect[0]=kKPlus;
56d47239	149	break;
56d47239	150	case kBJpsi:
00935af2	151	fChildSelect[0]= 443;
56d47239	152	break;
00935af2	153	case kChiToJpsiGammaToMuonMuon:
	154	fChildSelect[0]= 22;
	155	fChildSelect[1]= 13;
	156	break;
	157	case kChiToJpsiGammaToElectronElectron:
	158	fChildSelect[0]= 22;
	159	fChildSelect[1]= 11;
	160	break;
d3553100	161	case kLambda:
199786f7	162	fChildSelect[0]= kProton;
	163	fChildSelect[1]= 211;
	164	break;
	165	case kOmega:
e36044d6	166	case kAll:
2b1f8257	167	case kAllMuonic:
e36044d6	168	case kNoDecay:
d5f86442	169	case kNoDecayHeavy:
1fefb2d4	170	case kNoDecayBeauty:
847af604	171	case kNeutralPion:
e36044d6	172	break;
e36044d6	173	}
36d770d9	174
	175	if (fZTarget != 0 && fAProjectile != 0)
	176	{
	177	fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
	178	(Double_t(fZTarget) * Double_t(fAProjectile)));
	179	}
e36044d6	180	}
	181
	182
62d0ae06	183	Bool_t AliGenMC::ParentSelected(Int_t ip) const
e36044d6	184	{
	185	// True if particle is in list of parent particles to be selected
	186	for (Int_t i=0; i<8; i++)
	187	{
62d0ae06	188	if (fParentSelect.At(i) == ip) return kTRUE;
e36044d6	189	}
	190	return kFALSE;
	191	}
	192
62d0ae06	193	Bool_t AliGenMC::ChildSelected(Int_t ip) const
e36044d6	194	{
	195	// True if particle is in list of decay products to be selected
	196	for (Int_t i=0; i<5; i++)
	197	{
62d0ae06	198	if (fChildSelect.At(i) == ip) return kTRUE;
e36044d6	199	}
	200	return kFALSE;
	201	}
	202
62d0ae06	203	Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
e36044d6	204	{
e36044d6	205	// Perform kinematic selection
43a333ec	206	Double_t pz = particle->Pz();
43a333ec	207	Double_t pt = particle->Pt();
	208	Double_t p = particle->P();
	209	Double_t theta = particle->Theta();
	210	Double_t mass = particle->GetCalcMass();
	211	Double_t mt2 = pt * pt + mass * mass;
	212	Double_t phi = particle->Phi();
d643e262	213	Double_t e = particle->Energy();
	214
	215	if (e == 0.)
	216	e = TMath::Sqrt(p * p + mass * mass);
	217
95450c6d	218
95450c6d	219	Double_t y, y0;
95450c6d	220
fef61e14	221	if (TMath::Abs(pz) < e) {
95450c6d	222	y = 0.5*TMath::Log((e+pz)/(e-pz));
	223	} else {
	224	y = 1.e10;
	225	}
e36044d6	226
95450c6d	227	if (mt2) {
95450c6d	228	y0 = 0.5TMath::Log((e+TMath::Abs(pz))(e+TMath::Abs(pz))/mt2);
e36044d6	229	} else {
95450c6d	230	if (TMath::Abs(y) < 1.e10) {
	231	y0 = y;
	232	} else {
	233	y0 = 1.e10;
	234	}
e36044d6	235	}
95450c6d	236
95450c6d	237	y = (pz < 0) ? -y0 : y0;
e36044d6	238
	239	if (flag == 0) {
	240	//
	241	// Primary particle cuts
	242	//
	243	// transverse momentum cut
	244	if (pt > fPtMax \|\| pt < fPtMin) {
	245	// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
	246	return kFALSE;
	247	}
	248	//
	249	// momentum cut
	250	if (p > fPMax \|\| p < fPMin) {
	251	// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	252	return kFALSE;
	253	}
	254	//
	255	// theta cut
	256	if (theta > fThetaMax \|\| theta < fThetaMin) {
	257	// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	258	return kFALSE;
	259	}
	260	//
	261	// rapidity cut
	262	if (y > fYMax \|\| y < fYMin) {
	263	// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
	264	return kFALSE;
	265	}
	266	//
	267	// phi cut
	268	if (phi > fPhiMax \|\| phi < fPhiMin) {
	269	// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
	270	return kFALSE;
	271	}
	272	} else {
	273	//
	274	// Decay product cuts
	275	//
	276	// transverse momentum cut
	277	if (pt > fChildPtMax \|\| pt < fChildPtMin) {
	278	// printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
	279	return kFALSE;
	280	}
	281	//
	282	// momentum cut
	283	if (p > fChildPMax \|\| p < fChildPMin) {
	284	// printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
	285	return kFALSE;
	286	}
	287	//
	288	// theta cut
	289	if (theta > fChildThetaMax \|\| theta < fChildThetaMin) {
	290	// printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
	291	return kFALSE;
	292	}
	293	//
	294	// rapidity cut
	295	if (y > fChildYMax \|\| y < fChildYMin) {
	296	// printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
	297	return kFALSE;
	298	}
	299	//
	300	// phi cut
	301	if (phi > fChildPhiMax \|\| phi < fChildPhiMin) {
302	// printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
303	return kFALSE;
304	}
305	}
306
e36044d6	307	return kTRUE;
	308	}
	309
65de9f86	310	Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
65de9f86	311	{
e033748b	312	// Check the geometrical acceptance for particle.
	313
	314	Bool_t check ;
	315	Int_t numberOfPdgCodeParticleforAcceptanceCut = 0;
	316	Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0;
65de9f86	317	TParticle * particle;
65de9f86	318	Int_t i;
e033748b	319	for (i = 0; i < np; i++) {
65de9f86	320	particle = (TParticle *) particles->At(i);
65de9f86	321	if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
e033748b	322	numberOfPdgCodeParticleforAcceptanceCut++;
e033748b	323	if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++;
65de9f86	324	}
65de9f86	325	}
e033748b	326	if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
e033748b	327	check = kTRUE;
65de9f86	328	else
e033748b	329	check = kFALSE;
65de9f86	330
e033748b	331	return check;
65de9f86	332	}
65de9f86	333
62d0ae06	334	Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
e36044d6	335	{
	336	//
	337	// If the particle is in a diffractive state, then take action accordingly
	338	switch (pdgcode) {
	339	case 91:
	340	return 92;
	341	case 110:
	342	//rho_diff0 -- difficult to translate, return rho0
	343	return 113;
	344	case 210:
	345	//pi_diffr+ -- change to pi+
	346	return 211;
	347	case 220:
	348	//omega_di0 -- change to omega0
	349	return 223;
	350	case 330:
	351	//phi_diff0 -- return phi0
	352	return 333;
	353	case 440:
	354	//J/psi_di0 -- return J/psi
	355	return 443;
	356	case 2110:
	357	//n_diffr -- return neutron
	358	return 2112;
	359	case 2210:
	360	//p_diffr+ -- return proton
	361	return 2212;
	362	}
	363	//non diffractive state -- return code unchanged
	364	return pdgcode;
	365	}
3b945a60	366
36d770d9	367	void AliGenMC::Boost()
3b945a60	368	{
	369	//
	370	// Boost cms into LHC lab frame
	371	//
	372
36d770d9	373	Double_t beta = TMath::TanH(fDyBoost);
60e55aee	374	Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta));
3b945a60	375	Double_t gb = gamma * beta;
3b945a60	376
7cdba479	377	// printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma);
3b945a60	378
3b945a60	379	Int_t i;
ea24f998	380	Int_t np = fParticles.GetEntriesFast();
3b945a60	381	for (i = 0; i < np; i++)
3b945a60	382	{
ea24f998	383	TParticle* iparticle = (TParticle*) fParticles.At(i);
3b945a60	384
	385	Double_t e = iparticle->Energy();
	386	Double_t px = iparticle->Px();
	387	Double_t py = iparticle->Py();
	388	Double_t pz = iparticle->Pz();
	389
	390	Double_t eb = gamma * e - gb * pz;
	391	Double_t pzb = -gb * e + gamma * pz;
	392
	393	iparticle->SetMomentum(px, py, pzb, eb);
	394	}
	395	}
d97fb2bb	396
7eb751fe	397	void AliGenMC::BeamCrossAngle()
	398	{
	399	// Applies a boost in the y-direction in order to take into account the
	400	// beam crossing angle
	401
	402	Double_t thetaPr0, phiPr0, pyPr2, pzPr2;
	403	TVector3 beta;
	404
	405	thetaPr0 = fXingAngleY / 2.;
	406	phiPr0 = 0;
	407
	408	// Momentum of the CMS system
	409	pyPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Sin(thetaPr0);
	410	pzPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Cos(thetaPr0);
	411
	412	TLorentzVector proj1Vect, proj2Vect, projVect;
	413	proj1Vect.SetPxPyPzE(0., pyPr2, pzPr2, fEnergyCMS/2);
	414	proj2Vect.SetPxPyPzE(0., pyPr2,-pzPr2, fEnergyCMS/2);
	415	projVect = proj1Vect + proj2Vect;
	416	beta=(1. / projVect.E()) * (projVect.Vect());
	417
	418	Int_t i;
	419	Int_t np = fParticles.GetEntriesFast();
	420	for (i = 0; i < np; i++)
	421	{
	422	TParticle* iparticle = (TParticle*) fParticles.At(i);
	423
	424	Double_t e = iparticle->Energy();
	425	Double_t px = iparticle->Px();
	426	Double_t py = iparticle->Py();
	427	Double_t pz = iparticle->Pz();
	428
	429	TLorentzVector partIn;
	430	partIn.SetPxPyPzE(px,py,pz,e);
	431	partIn.Boost(beta);
	432	iparticle->SetMomentum(partIn.Px(),partIn.Py(),partIn.Pz(),partIn.E());
	433	}
	434	}
	435
	436
d97fb2bb	437	void AliGenMC::AddHeader(AliGenEventHeader* header)
	438	{
	439	// Passes header either to the container or to gAlice
	440	if (fContainer) {
	441	fContainer->AddHeader(header);
	442	} else {
	443	gAlice->SetGenEventHeader(header);
	444	}
	445	}