[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"
#include "AliDecayer.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:
    case kElectronEM:
    case kDiElectronEM:
	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 kPsiPrimeJpsiDiElectron:
        fChildSelect[0]= 211;
        fChildSelect[1]= 11;
	break;
    case kGammaEM:
        fChildSelect[0] = kGamma;	
        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(const 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
	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	/* $Id$ */
	17
	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
	24	#include <TClonesArray.h>
	25	#include <TMath.h>
	26	#include <TPDGCode.h>
	27	#include <TParticle.h>
	28	#include <TLorentzVector.h>
	29	#include <TVector3.h>
	30
	31	#include "AliGenMC.h"
	32	#include "AliRun.h"
	33	#include "AliGeometry.h"
	34	#include "AliDecayer.h"
	35
	36	ClassImp(AliGenMC)
	37
	38	AliGenMC::AliGenMC()
	39	:AliGenerator(),
	40	fParticles("TParticle", 1000),
	41	fParentSelect(8),
	42	fChildSelect(8),
	43	fCutOnChild(0),
	44	fChildPtMin(0.),
	45	fChildPtMax(1.e10),
	46	fChildPMin(0.),
	47	fChildPMax(1.e10),
	48	fChildPhiMin(0.),
	49	fChildPhiMax(2. * TMath::Pi()),
	50	fChildThetaMin(0.),
	51	fChildThetaMax(TMath::Pi()),
	52	fChildYMin(-12.),
	53	fChildYMax(12.),
	54	fXingAngleX(0.),
	55	fXingAngleY(0.),
	56	fForceDecay(kAll),
	57	fMaxLifeTime(1.e-15),
	58	fDyBoost(0.),
	59	fGeometryAcceptance(0),
	60	fPdgCodeParticleforAcceptanceCut(0),
	61	fNumberOfAcceptedParticles(0),
	62	fNprimaries(0)
	63	{
	64	// Default Constructor
	65	fAProjectile = 1;
	66	fZProjectile = 1;
	67	fATarget = 1;
	68	fZTarget = 1;
	69	fProjectile = "P";
	70	fTarget = "P";
	71	}
	72
	73	AliGenMC::AliGenMC(Int_t npart)
	74	:AliGenerator(npart),
	75	fParticles("TParticle", 1000),
	76	fParentSelect(8),
	77	fChildSelect(8),
	78	fCutOnChild(0),
	79	fChildPtMin(0.),
	80	fChildPtMax(1.e10),
	81	fChildPMin(0.),
	82	fChildPMax(1.e10),
	83	fChildPhiMin(0.),
	84	fChildPhiMax(2. * TMath::Pi()),
	85	fChildThetaMin(0.),
	86	fChildThetaMax(TMath::Pi()),
	87	fChildYMin(-12.),
	88	fChildYMax(12.),
	89	fXingAngleX(0.),
	90	fXingAngleY(0.),
	91	fForceDecay(kAll),
	92	fMaxLifeTime(1.e-15),
	93	fDyBoost(0.),
	94	fGeometryAcceptance(0),
	95	fPdgCodeParticleforAcceptanceCut(0),
	96	fNumberOfAcceptedParticles(0),
	97	fNprimaries(0)
	98	{
	99	// Constructor
	100	//
	101	fAProjectile = 1;
	102	fZProjectile = 1;
	103	fATarget = 1;
	104	fZTarget = 1;
	105	fProjectile = "P";
	106	fTarget = "P";
	107	for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
	108	}
	109
	110	AliGenMC::~AliGenMC()
	111	{
	112	// Destructor
	113	}
	114
	115	void AliGenMC::Init()
	116	{
	117	//
	118	// Initialization
	119	switch (fForceDecay) {
	120	case kBSemiElectronic:
	121	case kSemiElectronic:
	122	case kDiElectron:
	123	case kBJpsiDiElectron:
	124	case kBPsiPrimeDiElectron:
	125	case kElectronEM:
	126	case kDiElectronEM:
	127	fChildSelect[0] = kElectron;
	128	break;
	129	case kHardMuons:
	130	case kBSemiMuonic:
	131	case kSemiMuonic:
	132	case kDiMuon:
	133	case kBJpsiDiMuon:
	134	case kBPsiPrimeDiMuon:
	135	case kPiToMu:
	136	case kKaToMu:
	137	case kWToMuon:
	138	case kWToCharmToMuon:
	139	case kZDiMuon:
	140	case kZDiElectron:
	141	fChildSelect[0]=kMuonMinus;
	142	break;
	143	case kWToCharm:
	144	break;
	145	case kHadronicD:
	146	case kHadronicDWithout4Bodies:
	147	fChildSelect[0]=kPiPlus;
	148	fChildSelect[1]=kKPlus;
	149	break;
	150	case kPhiKK:
	151	fChildSelect[0]=kKPlus;
	152	break;
	153	case kBJpsi:
	154	fChildSelect[0]= 443;
	155	break;
	156	case kChiToJpsiGammaToMuonMuon:
	157	fChildSelect[0]= 22;
	158	fChildSelect[1]= 13;
	159	break;
	160	case kChiToJpsiGammaToElectronElectron:
	161	fChildSelect[0]= 22;
	162	fChildSelect[1]= 11;
	163	break;
	164	case kLambda:
	165	fChildSelect[0]= kProton;
	166	fChildSelect[1]= 211;
	167	break;
	168	case kPsiPrimeJpsiDiElectron:
	169	fChildSelect[0]= 211;
	170	fChildSelect[1]= 11;
	171	break;
	172	case kGammaEM:
	173	fChildSelect[0] = kGamma;
	174	break;
	175	case kOmega:
	176	case kAll:
	177	case kAllMuonic:
	178	case kNoDecay:
	179	case kNoDecayHeavy:
	180	case kNoDecayBeauty:
	181	case kNeutralPion:
	182	break;
	183	}
	184
	185	if (fZTarget != 0 && fAProjectile != 0)
	186	{
	187	fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
	188	(Double_t(fZTarget) * Double_t(fAProjectile)));
	189	}
	190	}
	191
	192
	193	Bool_t AliGenMC::ParentSelected(Int_t ip) const
	194	{
	195	// True if particle is in list of parent particles to be selected
	196	for (Int_t i=0; i<8; i++)
	197	{
	198	if (fParentSelect.At(i) == ip) return kTRUE;
	199	}
	200	return kFALSE;
	201	}
	202
	203	Bool_t AliGenMC::ChildSelected(Int_t ip) const
	204	{
	205	// True if particle is in list of decay products to be selected
	206	for (Int_t i=0; i<5; i++)
	207	{
	208	if (fChildSelect.At(i) == ip) return kTRUE;
	209	}
	210	return kFALSE;
	211	}
	212
	213	Bool_t AliGenMC::KinematicSelection(const TParticle *particle, Int_t flag) const
	214	{
	215	// Perform kinematic selection
	216	Double_t pz = particle->Pz();
	217	Double_t pt = particle->Pt();
	218	Double_t p = particle->P();
	219	Double_t theta = particle->Theta();
	220	Double_t mass = particle->GetCalcMass();
	221	Double_t mt2 = pt * pt + mass * mass;
	222	Double_t phi = particle->Phi();
	223	Double_t e = particle->Energy();
	224
	225	if (e == 0.)
	226	e = TMath::Sqrt(p * p + mass * mass);
	227
	228
	229	Double_t y, y0;
	230
	231	if (TMath::Abs(pz) < e) {
	232	y = 0.5*TMath::Log((e+pz)/(e-pz));
	233	} else {
	234	y = 1.e10;
	235	}
	236
	237	if (mt2) {
	238	y0 = 0.5TMath::Log((e+TMath::Abs(pz))(e+TMath::Abs(pz))/mt2);
	239	} else {
	240	if (TMath::Abs(y) < 1.e10) {
	241	y0 = y;
	242	} else {
	243	y0 = 1.e10;
	244	}
	245	}
	246
	247	y = (pz < 0) ? -y0 : y0;
	248
	249	if (flag == 0) {
	250	//
	251	// Primary particle cuts
	252	//
	253	// transverse momentum cut
	254	if (pt > fPtMax \|\| pt < fPtMin) {
	255	// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
	256	return kFALSE;
	257	}
	258	//
	259	// momentum cut
	260	if (p > fPMax \|\| p < fPMin) {
	261	// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	262	return kFALSE;
	263	}
	264	//
	265	// theta cut
	266	if (theta > fThetaMax \|\| theta < fThetaMin) {
	267	// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	268	return kFALSE;
	269	}
	270	//
	271	// rapidity cut
	272	if (y > fYMax \|\| y < fYMin) {
	273	// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
	274	return kFALSE;
	275	}
	276	//
	277	// phi cut
	278	if (phi > fPhiMax \|\| phi < fPhiMin) {
	279	// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
	280	return kFALSE;
	281	}
	282	} else {
	283	//
	284	// Decay product cuts
	285	//
	286	// transverse momentum cut
	287	if (pt > fChildPtMax \|\| pt < fChildPtMin) {
	288	// printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
	289	return kFALSE;
	290	}
	291	//
	292	// momentum cut
	293	if (p > fChildPMax \|\| p < fChildPMin) {
	294	// printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
	295	return kFALSE;
	296	}
	297	//
	298	// theta cut
	299	if (theta > fChildThetaMax \|\| theta < fChildThetaMin) {
	300	// printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
	301	return kFALSE;
	302	}
	303	//
	304	// rapidity cut
	305	if (y > fChildYMax \|\| y < fChildYMin) {
	306	// printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
	307	return kFALSE;
	308	}
	309	//
	310	// phi cut
	311	if (phi > fChildPhiMax \|\| phi < fChildPhiMin) {
	312	// printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
	313	return kFALSE;
	314	}
	315	}
	316
	317	return kTRUE;
	318	}
	319
	320	Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
	321	{
	322	// Check the geometrical acceptance for particle.
	323
	324	Bool_t check ;
	325	Int_t numberOfPdgCodeParticleforAcceptanceCut = 0;
	326	Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0;
	327	TParticle * particle;
	328	Int_t i;
	329	for (i = 0; i < np; i++) {
	330	particle = (TParticle *) particles->At(i);
	331	if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
	332	numberOfPdgCodeParticleforAcceptanceCut++;
	333	if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++;
	334	}
	335	}
	336	if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
	337	check = kTRUE;
	338	else
	339	check = kFALSE;
	340
	341	return check;
	342	}
	343
	344	Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
	345	{
	346	//
	347	// If the particle is in a diffractive state, then take action accordingly
	348	switch (pdgcode) {
	349	case 91:
	350	return 92;
	351	case 110:
	352	//rho_diff0 -- difficult to translate, return rho0
	353	return 113;
	354	case 210:
	355	//pi_diffr+ -- change to pi+
	356	return 211;
	357	case 220:
	358	//omega_di0 -- change to omega0
	359	return 223;
	360	case 330:
	361	//phi_diff0 -- return phi0
	362	return 333;
	363	case 440:
	364	//J/psi_di0 -- return J/psi
	365	return 443;
	366	case 2110:
	367	//n_diffr -- return neutron
	368	return 2112;
	369	case 2210:
	370	//p_diffr+ -- return proton
	371	return 2212;
	372	}
	373	//non diffractive state -- return code unchanged
	374	return pdgcode;
	375	}
	376
	377	void AliGenMC::Boost()
	378	{
	379	//
	380	// Boost cms into LHC lab frame
	381	//
	382
	383	Double_t beta = TMath::TanH(fDyBoost);
	384	Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta));
	385	Double_t gb = gamma * beta;
	386
	387	// printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma);
	388
	389	Int_t i;
	390	Int_t np = fParticles.GetEntriesFast();
	391	for (i = 0; i < np; i++)
	392	{
	393	TParticle* iparticle = (TParticle*) fParticles.At(i);
	394
	395	Double_t e = iparticle->Energy();
	396	Double_t px = iparticle->Px();
	397	Double_t py = iparticle->Py();
	398	Double_t pz = iparticle->Pz();
	399
	400	Double_t eb = gamma * e - gb * pz;
	401	Double_t pzb = -gb * e + gamma * pz;
	402
	403	iparticle->SetMomentum(px, py, pzb, eb);
	404	}
	405	}
	406
	407	void AliGenMC::BeamCrossAngle()
	408	{
	409	// Applies a boost in the y-direction in order to take into account the
	410	// beam crossing angle
	411
	412	Double_t thetaPr0, phiPr0, pyPr2, pzPr2;
	413	TVector3 beta;
	414
	415	thetaPr0 = fXingAngleY / 2.;
	416	phiPr0 = 0;
	417
	418	// Momentum of the CMS system
	419	pyPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Sin(thetaPr0);
	420	pzPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Cos(thetaPr0);
	421
	422	TLorentzVector proj1Vect, proj2Vect, projVect;
	423	proj1Vect.SetPxPyPzE(0., pyPr2, pzPr2, fEnergyCMS/2);
	424	proj2Vect.SetPxPyPzE(0., pyPr2,-pzPr2, fEnergyCMS/2);
	425	projVect = proj1Vect + proj2Vect;
	426	beta=(1. / projVect.E()) * (projVect.Vect());
	427
	428	Int_t i;
	429	Int_t np = fParticles.GetEntriesFast();
	430	for (i = 0; i < np; i++)
	431	{
	432	TParticle* iparticle = (TParticle*) fParticles.At(i);
	433
	434	Double_t e = iparticle->Energy();
	435	Double_t px = iparticle->Px();
	436	Double_t py = iparticle->Py();
	437	Double_t pz = iparticle->Pz();
	438
	439	TLorentzVector partIn;
	440	partIn.SetPxPyPzE(px,py,pz,e);
	441	partIn.Boost(beta);
	442	iparticle->SetMomentum(partIn.Px(),partIn.Py(),partIn.Pz(),partIn.E());
	443	}
	444	}
	445
	446
	447	void AliGenMC::AddHeader(AliGenEventHeader* header)
	448	{
	449	// Passes header either to the container or to gAlice
	450	if (fContainer) {
	451	fContainer->AddHeader(header);
	452	} else {
	453	gAlice->SetGenEventHeader(header);
	454	}
	455	}