[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 "AliGenEventHeader.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 kDSemiMuonic:
    case kSemiMuonic:
    case kDiMuon:
    case kJpsiDiMuon:
    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:
    case kHadronicDWithV0:
    case kHadronicDWithout4BodiesWithV0:
	fChildSelect[0]=kPiPlus;
	fChildSelect[1]=kKPlus;
	break;
    case kPhiKK:
	fChildSelect[0]=kKPlus;
	break;
    case kBJpsi:
    case kBJpsiUndecayed:
	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:
    case kBeautyUpgrade:
	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, pyPr2, pzPr2;
  TVector3 beta;
  
  thetaPr0 = fXingAngleY / 2.;

  // 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) {
        header->SetName(fName);
	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"
e052713d	32	#include "AliGenEventHeader.h"
d97fb2bb	33	#include "AliRun.h"
ac3faee4	34	#include "AliGeometry.h"
4a33c50d	35	#include "AliDecayer.h"
116cbefd	36
198bb1c7	37	ClassImp(AliGenMC)
e36044d6	38
e36044d6	39	AliGenMC::AliGenMC()
1c56e311	40	:AliGenerator(),
969a210b	41	fParticles("TParticle", 1000),
1c56e311	42	fParentSelect(8),
	43	fChildSelect(8),
	44	fCutOnChild(0),
	45	fChildPtMin(0.),
	46	fChildPtMax(1.e10),
	47	fChildPMin(0.),
	48	fChildPMax(1.e10),
	49	fChildPhiMin(0.),
	50	fChildPhiMax(2. * TMath::Pi()),
	51	fChildThetaMin(0.),
	52	fChildThetaMax(TMath::Pi()),
	53	fChildYMin(-12.),
	54	fChildYMax(12.),
	55	fXingAngleX(0.),
	56	fXingAngleY(0.),
	57	fForceDecay(kAll),
	58	fMaxLifeTime(1.e-15),
1c56e311	59	fDyBoost(0.),
	60	fGeometryAcceptance(0),
	61	fPdgCodeParticleforAcceptanceCut(0),
d97fb2bb	62	fNumberOfAcceptedParticles(0),
e7c989e4	63	fNprimaries(0)
e36044d6	64	{
e36044d6	65	// Default Constructor
e7c989e4	66	fAProjectile = 1;
	67	fZProjectile = 1;
	68	fATarget = 1;
	69	fZTarget = 1;
	70	fProjectile = "P";
	71	fTarget = "P";
e36044d6	72	}
	73
	74	AliGenMC::AliGenMC(Int_t npart)
1c56e311	75	:AliGenerator(npart),
ea24f998	76	fParticles("TParticle", 1000),
1c56e311	77	fParentSelect(8),
	78	fChildSelect(8),
	79	fCutOnChild(0),
	80	fChildPtMin(0.),
	81	fChildPtMax(1.e10),
	82	fChildPMin(0.),
	83	fChildPMax(1.e10),
	84	fChildPhiMin(0.),
	85	fChildPhiMax(2. * TMath::Pi()),
	86	fChildThetaMin(0.),
	87	fChildThetaMax(TMath::Pi()),
	88	fChildYMin(-12.),
	89	fChildYMax(12.),
	90	fXingAngleX(0.),
	91	fXingAngleY(0.),
	92	fForceDecay(kAll),
	93	fMaxLifeTime(1.e-15),
1c56e311	94	fDyBoost(0.),
	95	fGeometryAcceptance(0),
	96	fPdgCodeParticleforAcceptanceCut(0),
d97fb2bb	97	fNumberOfAcceptedParticles(0),
e7c989e4	98	fNprimaries(0)
e36044d6	99	{
e36044d6	100	// Constructor
e36044d6	101	//
e7c989e4	102	fAProjectile = 1;
	103	fZProjectile = 1;
	104	fATarget = 1;
	105	fZTarget = 1;
	106	fProjectile = "P";
	107	fTarget = "P";
	108	for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
e36044d6	109	}
e36044d6	110
e36044d6	111	AliGenMC::~AliGenMC()
	112	{
	113	// Destructor
	114	}
	115
	116	void AliGenMC::Init()
	117	{
	118	//
	119	// Initialization
	120	switch (fForceDecay) {
e345c619	121	case kBSemiElectronic:
e36044d6	122	case kSemiElectronic:
	123	case kDiElectron:
	124	case kBJpsiDiElectron:
	125	case kBPsiPrimeDiElectron:
e40b9538	126	case kElectronEM:
e40b9538	127	case kDiElectronEM:
47fc6bd5	128	fChildSelect[0] = kElectron;
e36044d6	129	break;
2dcb5874	130	case kHardMuons:
e345c619	131	case kBSemiMuonic:
62e445df	132	case kDSemiMuonic:
e36044d6	133	case kSemiMuonic:
e36044d6	134	case kDiMuon:
38a19176	135	case kJpsiDiMuon:
e36044d6	136	case kBJpsiDiMuon:
	137	case kBPsiPrimeDiMuon:
	138	case kPiToMu:
	139	case kKaToMu:
cd159249	140	case kWToMuon:
cd159249	141	case kWToCharmToMuon:
2f299526	142	case kZDiMuon:
f5b581a1	143	case kZDiElectron:
e36044d6	144	fChildSelect[0]=kMuonMinus;
e36044d6	145	break;
cd159249	146	case kWToCharm:
cd159249	147	break;
e36044d6	148	case kHadronicD:
af33df34	149	case kHadronicDWithout4Bodies:
755d73ca	150	case kHadronicDWithV0:
755d73ca	151	case kHadronicDWithout4BodiesWithV0:
e36044d6	152	fChildSelect[0]=kPiPlus;
	153	fChildSelect[1]=kKPlus;
	154	break;
00cb2f27	155	case kPhiKK:
027677ae	156	fChildSelect[0]=kKPlus;
56d47239	157	break;
56d47239	158	case kBJpsi:
f2f8bbb9	159	case kBJpsiUndecayed:
00935af2	160	fChildSelect[0]= 443;
56d47239	161	break;
00935af2	162	case kChiToJpsiGammaToMuonMuon:
	163	fChildSelect[0]= 22;
	164	fChildSelect[1]= 13;
	165	break;
	166	case kChiToJpsiGammaToElectronElectron:
	167	fChildSelect[0]= 22;
	168	fChildSelect[1]= 11;
	169	break;
d3553100	170	case kLambda:
199786f7	171	fChildSelect[0]= kProton;
	172	fChildSelect[1]= 211;
	173	break;
9610308a	174	case kPsiPrimeJpsiDiElectron:
e40b9538	175	fChildSelect[0]= 211;
	176	fChildSelect[1]= 11;
	177	break;
	178	case kGammaEM:
	179	fChildSelect[0] = kGamma;
	180	break;
199786f7	181	case kOmega:
e36044d6	182	case kAll:
2b1f8257	183	case kAllMuonic:
e36044d6	184	case kNoDecay:
d5f86442	185	case kNoDecayHeavy:
1fefb2d4	186	case kNoDecayBeauty:
847af604	187	case kNeutralPion:
482c0e0c	188	case kBeautyUpgrade:
e36044d6	189	break;
e36044d6	190	}
36d770d9	191
	192	if (fZTarget != 0 && fAProjectile != 0)
	193	{
	194	fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
	195	(Double_t(fZTarget) * Double_t(fAProjectile)));
	196	}
e36044d6	197	}
	198
	199
62d0ae06	200	Bool_t AliGenMC::ParentSelected(Int_t ip) const
e36044d6	201	{
	202	// True if particle is in list of parent particles to be selected
	203	for (Int_t i=0; i<8; i++)
	204	{
62d0ae06	205	if (fParentSelect.At(i) == ip) return kTRUE;
e36044d6	206	}
	207	return kFALSE;
	208	}
	209
62d0ae06	210	Bool_t AliGenMC::ChildSelected(Int_t ip) const
e36044d6	211	{
	212	// True if particle is in list of decay products to be selected
	213	for (Int_t i=0; i<5; i++)
	214	{
62d0ae06	215	if (fChildSelect.At(i) == ip) return kTRUE;
e36044d6	216	}
	217	return kFALSE;
	218	}
	219
4a33c50d	220	Bool_t AliGenMC::KinematicSelection(const TParticle *particle, Int_t flag) const
e36044d6	221	{
e36044d6	222	// Perform kinematic selection
43a333ec	223	Double_t pz = particle->Pz();
43a333ec	224	Double_t pt = particle->Pt();
	225	Double_t p = particle->P();
	226	Double_t theta = particle->Theta();
	227	Double_t mass = particle->GetCalcMass();
	228	Double_t mt2 = pt * pt + mass * mass;
	229	Double_t phi = particle->Phi();
d643e262	230	Double_t e = particle->Energy();
	231
	232	if (e == 0.)
	233	e = TMath::Sqrt(p * p + mass * mass);
	234
95450c6d	235
95450c6d	236	Double_t y, y0;
95450c6d	237
fef61e14	238	if (TMath::Abs(pz) < e) {
95450c6d	239	y = 0.5*TMath::Log((e+pz)/(e-pz));
	240	} else {
	241	y = 1.e10;
	242	}
e36044d6	243
95450c6d	244	if (mt2) {
95450c6d	245	y0 = 0.5TMath::Log((e+TMath::Abs(pz))(e+TMath::Abs(pz))/mt2);
e36044d6	246	} else {
95450c6d	247	if (TMath::Abs(y) < 1.e10) {
	248	y0 = y;
	249	} else {
	250	y0 = 1.e10;
	251	}
e36044d6	252	}
95450c6d	253
95450c6d	254	y = (pz < 0) ? -y0 : y0;
e36044d6	255
	256	if (flag == 0) {
	257	//
	258	// Primary particle cuts
	259	//
	260	// transverse momentum cut
	261	if (pt > fPtMax \|\| pt < fPtMin) {
	262	// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
	263	return kFALSE;
	264	}
	265	//
	266	// momentum cut
	267	if (p > fPMax \|\| p < fPMin) {
	268	// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	269	return kFALSE;
	270	}
	271	//
	272	// theta cut
	273	if (theta > fThetaMax \|\| theta < fThetaMin) {
	274	// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	275	return kFALSE;
	276	}
	277	//
	278	// rapidity cut
	279	if (y > fYMax \|\| y < fYMin) {
	280	// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
	281	return kFALSE;
	282	}
	283	//
	284	// phi cut
	285	if (phi > fPhiMax \|\| phi < fPhiMin) {
	286	// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
	287	return kFALSE;
	288	}
	289	} else {
	290	//
	291	// Decay product cuts
	292	//
	293	// transverse momentum cut
	294	if (pt > fChildPtMax \|\| pt < fChildPtMin) {
	295	// printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
	296	return kFALSE;
	297	}
	298	//
	299	// momentum cut
	300	if (p > fChildPMax \|\| p < fChildPMin) {
	301	// printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
	302	return kFALSE;
	303	}
	304	//
	305	// theta cut
	306	if (theta > fChildThetaMax \|\| theta < fChildThetaMin) {
	307	// printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
	308	return kFALSE;
	309	}
	310	//
	311	// rapidity cut
	312	if (y > fChildYMax \|\| y < fChildYMin) {
	313	// printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
	314	return kFALSE;
	315	}
	316	//
	317	// phi cut
	318	if (phi > fChildPhiMax \|\| phi < fChildPhiMin) {
319	// printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
320	return kFALSE;
321	}
322	}
323
e36044d6	324	return kTRUE;
	325	}
	326
65de9f86	327	Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
65de9f86	328	{
e033748b	329	// Check the geometrical acceptance for particle.
	330
	331	Bool_t check ;
	332	Int_t numberOfPdgCodeParticleforAcceptanceCut = 0;
	333	Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0;
65de9f86	334	TParticle * particle;
65de9f86	335	Int_t i;
e033748b	336	for (i = 0; i < np; i++) {
65de9f86	337	particle = (TParticle *) particles->At(i);
65de9f86	338	if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
e033748b	339	numberOfPdgCodeParticleforAcceptanceCut++;
e033748b	340	if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++;
65de9f86	341	}
65de9f86	342	}
e033748b	343	if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
e033748b	344	check = kTRUE;
65de9f86	345	else
e033748b	346	check = kFALSE;
65de9f86	347
e033748b	348	return check;
65de9f86	349	}
65de9f86	350
62d0ae06	351	Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
e36044d6	352	{
	353	//
	354	// If the particle is in a diffractive state, then take action accordingly
	355	switch (pdgcode) {
	356	case 91:
	357	return 92;
	358	case 110:
	359	//rho_diff0 -- difficult to translate, return rho0
	360	return 113;
	361	case 210:
	362	//pi_diffr+ -- change to pi+
	363	return 211;
	364	case 220:
	365	//omega_di0 -- change to omega0
	366	return 223;
	367	case 330:
	368	//phi_diff0 -- return phi0
	369	return 333;
	370	case 440:
	371	//J/psi_di0 -- return J/psi
	372	return 443;
	373	case 2110:
	374	//n_diffr -- return neutron
	375	return 2112;
	376	case 2210:
	377	//p_diffr+ -- return proton
	378	return 2212;
	379	}
	380	//non diffractive state -- return code unchanged
	381	return pdgcode;
	382	}
3b945a60	383
36d770d9	384	void AliGenMC::Boost()
3b945a60	385	{
	386	//
	387	// Boost cms into LHC lab frame
	388	//
	389
36d770d9	390	Double_t beta = TMath::TanH(fDyBoost);
60e55aee	391	Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta));
3b945a60	392	Double_t gb = gamma * beta;
3b945a60	393
cda4be86	394	// printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma);
3b945a60	395
3b945a60	396	Int_t i;
ea24f998	397	Int_t np = fParticles.GetEntriesFast();
3b945a60	398	for (i = 0; i < np; i++)
3b945a60	399	{
ea24f998	400	TParticle* iparticle = (TParticle*) fParticles.At(i);
3b945a60	401
	402	Double_t e = iparticle->Energy();
	403	Double_t px = iparticle->Px();
	404	Double_t py = iparticle->Py();
	405	Double_t pz = iparticle->Pz();
	406
	407	Double_t eb = gamma * e - gb * pz;
	408	Double_t pzb = -gb * e + gamma * pz;
	409
	410	iparticle->SetMomentum(px, py, pzb, eb);
	411	}
	412	}
d97fb2bb	413
7eb751fe	414	void AliGenMC::BeamCrossAngle()
	415	{
	416	// Applies a boost in the y-direction in order to take into account the
	417	// beam crossing angle
	418
89c6e78b	419	Double_t thetaPr0, pyPr2, pzPr2;
7eb751fe	420	TVector3 beta;
	421
	422	thetaPr0 = fXingAngleY / 2.;
7eb751fe	423
	424	// Momentum of the CMS system
	425	pyPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Sin(thetaPr0);
	426	pzPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Cos(thetaPr0);
	427
	428	TLorentzVector proj1Vect, proj2Vect, projVect;
	429	proj1Vect.SetPxPyPzE(0., pyPr2, pzPr2, fEnergyCMS/2);
	430	proj2Vect.SetPxPyPzE(0., pyPr2,-pzPr2, fEnergyCMS/2);
	431	projVect = proj1Vect + proj2Vect;
	432	beta=(1. / projVect.E()) * (projVect.Vect());
	433
	434	Int_t i;
	435	Int_t np = fParticles.GetEntriesFast();
	436	for (i = 0; i < np; i++)
	437	{
	438	TParticle* iparticle = (TParticle*) fParticles.At(i);
	439
	440	Double_t e = iparticle->Energy();
	441	Double_t px = iparticle->Px();
	442	Double_t py = iparticle->Py();
	443	Double_t pz = iparticle->Pz();
	444
	445	TLorentzVector partIn;
	446	partIn.SetPxPyPzE(px,py,pz,e);
	447	partIn.Boost(beta);
	448	iparticle->SetMomentum(partIn.Px(),partIn.Py(),partIn.Pz(),partIn.E());
	449	}
	450	}
	451
	452
d97fb2bb	453	void AliGenMC::AddHeader(AliGenEventHeader* header)
	454	{
	455	// Passes header either to the container or to gAlice
	456	if (fContainer) {
e052713d	457	header->SetName(fName);
d97fb2bb	458	fContainer->AddHeader(header);
	459	} else {
	460	gAlice->SetGenEventHeader(header);
	461	}
	462	}