[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.                  *
 **************************************************************************/

/*
$Log$
Revision 1.14  2003/01/14 10:50:19  alibrary
Cleanup of STEER coding conventions

Revision 1.13  2002/10/14 14:55:35  hristov
Merging the VirtualMC branch to the main development branch (HEAD)

Revision 1.5.4.2  2002/07/24 08:56:28  alibrary
Updating EVGEN on TVirtulaMC

Revision 1.12  2002/07/19 11:42:33  morsch
Use CalcMass()

Revision 1.11  2002/06/06 15:26:24  morsch
Correct child-selection for kPhiKK

Revision 1.10  2002/06/05 14:05:46  morsch
Decayer option kPhiKK for forced phi->K+K- decay added.

Revision 1.9  2002/05/30 14:58:29  morsch
Add pointer to AliGeometry to handle geometrical acceptance. (G. MArtinez)

Revision 1.8  2002/04/26 10:42:35  morsch
Case kNoDecayHeavy added. (N. Carrer)

Revision 1.7  2002/04/17 10:32:32  morsch
Coding Rule violations corrected.

Revision 1.6  2002/03/26 14:19:36  morsch
Saver calculation of rapdity.

Revision 1.5  2002/03/12 17:02:20  morsch
Change in calculation of rapidity, include case in which numerically e == pz.

Revision 1.4  2001/11/27 13:13:07  morsch
Maximum lifetime for long-lived particles to be put on the stack is parameter.
It can be set via SetMaximumLifetime(..).

Revision 1.3  2001/10/16 08:48:56  morsch
Common vertex related code moved to base class AliGenerator.

Revision 1.2  2001/10/15 08:15:51  morsch
Event vertex and vertex truncation setting moved into AliMC.

Revision 1.1  2001/07/13 10:56:00  morsch
AliGenMC base class for AliGenParam and AliGenPythia commonalities.

*/

// 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 <TMath.h>
#include <TPDGCode.h>
#include <TParticle.h>

#include "AliGenMC.h"

 ClassImp(AliGenMC)

AliGenMC::AliGenMC()
                 :AliGenerator()
{
// Default Constructor
    SetCutOnChild();
    SetChildMomentumRange();
    SetChildPtRange();
    SetChildPhiRange();
    SetChildThetaRange(); 
    SetChildYRange(); 
    SetMaximumLifetime();
    SetGeometryAcceptance();
    SetPdgCodeParticleforAcceptanceCut();
    SetNumberOfAcceptedParticles();
    SetTarget();
    SetProjectile();
}

AliGenMC::AliGenMC(Int_t npart)
                 :AliGenerator(npart)
{
//  Constructor
    SetCutOnChild();
    SetChildMomentumRange();
    SetChildPtRange();
    SetChildPhiRange();
    SetChildThetaRange();
    SetChildYRange(); 
// 
    fParentSelect.Set(8);
    fChildSelect.Set(8);
    for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
    SetMaximumLifetime();
    SetGeometryAcceptance();
    SetPdgCodeParticleforAcceptanceCut();
    SetNumberOfAcceptedParticles();
    SetTarget();
    SetProjectile();
}

AliGenMC::AliGenMC(const AliGenMC & mc)
{
// copy constructor
}

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

void AliGenMC::Init()
{
//
//  Initialization
    switch (fForceDecay) {
    case kSemiElectronic:
    case kDiElectron:
    case kBJpsiDiElectron:
    case kBPsiPrimeDiElectron:
	fChildSelect[0] = kElectron;	
	break;
    case kSemiMuonic:
    case kDiMuon:
    case kBJpsiDiMuon:
    case kBPsiPrimeDiMuon:
    case kPiToMu:
    case kKaToMu:
	fChildSelect[0]=kMuonMinus;
	break;
    case kHadronicD:
	fChildSelect[0]=kPiPlus;
	fChildSelect[1]=kKPlus;
	break;
    case kPhiKK:
	fChildSelect[0]=kKPlus;
    case kOmega:	
    case kAll:
    case kNoDecay:
    case kNoDecayHeavy:
	break;
    }
}


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
    Float_t px    = particle->Px();
    Float_t py    = particle->Py();
    Float_t pz    = particle->Pz();
    Float_t  e    = particle->Energy();
    Float_t pt    = particle->Pt();
    Float_t p     = particle->P();
    Float_t theta = particle->Theta();
    Float_t mass  = particle->GetCalcMass();
    Float_t mt2   = pt * pt + mass * mass;
    
    Float_t phi   = Float_t(TMath::ATan2(Double_t(py),Double_t(px)));
    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)
{
  Bool_t Check ;  // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance
  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(Float_t dy)
{
//
// Boost cms into LHC lab frame
//

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

    printf("\n Boosting particles to lab frame %f %f %f", dy, 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);
    }
}


AliGenMC& AliGenMC::operator=(const  AliGenMC& rhs)
{
// Assignment operator
    return *this;
}
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
	16	/*
	17	$Log$
3b945a60	18	Revision 1.14 2003/01/14 10:50:19 alibrary
	19	Cleanup of STEER coding conventions
	20
116cbefd	21	Revision 1.13 2002/10/14 14:55:35 hristov
	22	Merging the VirtualMC branch to the main development branch (HEAD)
	23
b9d0a01d	24	Revision 1.5.4.2 2002/07/24 08:56:28 alibrary
	25	Updating EVGEN on TVirtulaMC
	26
	27	Revision 1.12 2002/07/19 11:42:33 morsch
	28	Use CalcMass()
	29
cf01ee36	30	Revision 1.11 2002/06/06 15:26:24 morsch
	31	Correct child-selection for kPhiKK
	32
027677ae	33	Revision 1.10 2002/06/05 14:05:46 morsch
	34	Decayer option kPhiKK for forced phi->K+K- decay added.
	35
00cb2f27	36	Revision 1.9 2002/05/30 14:58:29 morsch
	37	Add pointer to AliGeometry to handle geometrical acceptance. (G. MArtinez)
	38
65de9f86	39	Revision 1.8 2002/04/26 10:42:35 morsch
	40	Case kNoDecayHeavy added. (N. Carrer)
	41
d5f86442	42	Revision 1.7 2002/04/17 10:32:32 morsch
	43	Coding Rule violations corrected.
	44
62d0ae06	45	Revision 1.6 2002/03/26 14:19:36 morsch
	46	Saver calculation of rapdity.
	47
fef61e14	48	Revision 1.5 2002/03/12 17:02:20 morsch
	49	Change in calculation of rapidity, include case in which numerically e == pz.
	50
95450c6d	51	Revision 1.4 2001/11/27 13:13:07 morsch
	52	Maximum lifetime for long-lived particles to be put on the stack is parameter.
	53	It can be set via SetMaximumLifetime(..).
	54
47fc6bd5	55	Revision 1.3 2001/10/16 08:48:56 morsch
	56	Common vertex related code moved to base class AliGenerator.
	57
b80a8e41	58	Revision 1.2 2001/10/15 08:15:51 morsch
	59	Event vertex and vertex truncation setting moved into AliMC.
	60
dba8ac91	61	Revision 1.1 2001/07/13 10:56:00 morsch
	62	AliGenMC base class for AliGenParam and AliGenPythia commonalities.
	63
e36044d6	64	*/
e36044d6	65
62d0ae06	66	// Base class for generators using external MC generators.
	67	// For example AliGenPythia using Pythia.
	68	// Provides basic functionality: setting of kinematic cuts on
	69	// decay products and particle selection.
	70	// andreas.morsch@cern.ch
	71
65de9f86	72	#include <TMath.h>
116cbefd	73	#include <TPDGCode.h>
e36044d6	74	#include <TParticle.h>
e36044d6	75
116cbefd	76	#include "AliGenMC.h"
116cbefd	77
e36044d6	78	ClassImp(AliGenMC)
	79
	80	AliGenMC::AliGenMC()
	81	:AliGenerator()
	82	{
	83	// Default Constructor
	84	SetCutOnChild();
	85	SetChildMomentumRange();
	86	SetChildPtRange();
	87	SetChildPhiRange();
	88	SetChildThetaRange();
	89	SetChildYRange();
47fc6bd5	90	SetMaximumLifetime();
65de9f86	91	SetGeometryAcceptance();
	92	SetPdgCodeParticleforAcceptanceCut();
	93	SetNumberOfAcceptedParticles();
3b945a60	94	SetTarget();
3b945a60	95	SetProjectile();
e36044d6	96	}
	97
	98	AliGenMC::AliGenMC(Int_t npart)
	99	:AliGenerator(npart)
	100	{
	101	// Constructor
	102	SetCutOnChild();
	103	SetChildMomentumRange();
	104	SetChildPtRange();
	105	SetChildPhiRange();
	106	SetChildThetaRange();
	107	SetChildYRange();
	108	//
	109	fParentSelect.Set(8);
	110	fChildSelect.Set(8);
	111	for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0;
47fc6bd5	112	SetMaximumLifetime();
65de9f86	113	SetGeometryAcceptance();
	114	SetPdgCodeParticleforAcceptanceCut();
	115	SetNumberOfAcceptedParticles();
3b945a60	116	SetTarget();
3b945a60	117	SetProjectile();
e36044d6	118	}
	119
	120	AliGenMC::AliGenMC(const AliGenMC & mc)
	121	{
	122	// copy constructor
	123	}
	124
	125	AliGenMC::~AliGenMC()
	126	{
	127	// Destructor
	128	}
	129
	130	void AliGenMC::Init()
	131	{
	132	//
	133	// Initialization
	134	switch (fForceDecay) {
	135	case kSemiElectronic:
	136	case kDiElectron:
	137	case kBJpsiDiElectron:
	138	case kBPsiPrimeDiElectron:
47fc6bd5	139	fChildSelect[0] = kElectron;
e36044d6	140	break;
	141	case kSemiMuonic:
	142	case kDiMuon:
	143	case kBJpsiDiMuon:
	144	case kBPsiPrimeDiMuon:
	145	case kPiToMu:
	146	case kKaToMu:
	147	fChildSelect[0]=kMuonMinus;
	148	break;
	149	case kHadronicD:
	150	fChildSelect[0]=kPiPlus;
	151	fChildSelect[1]=kKPlus;
	152	break;
00cb2f27	153	case kPhiKK:
027677ae	154	fChildSelect[0]=kKPlus;
62d0ae06	155	case kOmega:
e36044d6	156	case kAll:
e36044d6	157	case kNoDecay:
d5f86442	158	case kNoDecayHeavy:
e36044d6	159	break;
	160	}
	161	}
	162
	163
62d0ae06	164	Bool_t AliGenMC::ParentSelected(Int_t ip) const
e36044d6	165	{
	166	// True if particle is in list of parent particles to be selected
	167	for (Int_t i=0; i<8; i++)
	168	{
62d0ae06	169	if (fParentSelect.At(i) == ip) return kTRUE;
e36044d6	170	}
	171	return kFALSE;
	172	}
	173
62d0ae06	174	Bool_t AliGenMC::ChildSelected(Int_t ip) const
e36044d6	175	{
	176	// True if particle is in list of decay products to be selected
	177	for (Int_t i=0; i<5; i++)
	178	{
62d0ae06	179	if (fChildSelect.At(i) == ip) return kTRUE;
e36044d6	180	}
	181	return kFALSE;
	182	}
	183
62d0ae06	184	Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const
e36044d6	185	{
	186	// Perform kinematic selection
	187	Float_t px = particle->Px();
	188	Float_t py = particle->Py();
	189	Float_t pz = particle->Pz();
	190	Float_t e = particle->Energy();
	191	Float_t pt = particle->Pt();
	192	Float_t p = particle->P();
	193	Float_t theta = particle->Theta();
cf01ee36	194	Float_t mass = particle->GetCalcMass();
95450c6d	195	Float_t mt2 = pt * pt + mass * mass;
95450c6d	196
e36044d6	197	Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px)));
95450c6d	198	Double_t y, y0;
95450c6d	199
fef61e14	200	if (TMath::Abs(pz) < e) {
95450c6d	201	y = 0.5*TMath::Log((e+pz)/(e-pz));
	202	} else {
	203	y = 1.e10;
	204	}
e36044d6	205
95450c6d	206	if (mt2) {
95450c6d	207	y0 = 0.5TMath::Log((e+TMath::Abs(pz))(e+TMath::Abs(pz))/mt2);
e36044d6	208	} else {
95450c6d	209	if (TMath::Abs(y) < 1.e10) {
	210	y0 = y;
	211	} else {
	212	y0 = 1.e10;
	213	}
e36044d6	214	}
95450c6d	215
95450c6d	216	y = (pz < 0) ? -y0 : y0;
e36044d6	217
	218	if (flag == 0) {
	219	//
	220	// Primary particle cuts
	221	//
	222	// transverse momentum cut
	223	if (pt > fPtMax \|\| pt < fPtMin) {
	224	// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
	225	return kFALSE;
	226	}
	227	//
	228	// momentum cut
	229	if (p > fPMax \|\| p < fPMin) {
	230	// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	231	return kFALSE;
	232	}
	233	//
	234	// theta cut
	235	if (theta > fThetaMax \|\| theta < fThetaMin) {
	236	// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	237	return kFALSE;
	238	}
	239	//
	240	// rapidity cut
	241	if (y > fYMax \|\| y < fYMin) {
	242	// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
	243	return kFALSE;
	244	}
	245	//
	246	// phi cut
	247	if (phi > fPhiMax \|\| phi < fPhiMin) {
	248	// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
	249	return kFALSE;
	250	}
	251	} else {
	252	//
	253	// Decay product cuts
	254	//
	255	// transverse momentum cut
	256	if (pt > fChildPtMax \|\| pt < fChildPtMin) {
	257	// printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax);
	258	return kFALSE;
	259	}
	260	//
	261	// momentum cut
	262	if (p > fChildPMax \|\| p < fChildPMin) {
	263	// printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax);
	264	return kFALSE;
	265	}
	266	//
	267	// theta cut
	268	if (theta > fChildThetaMax \|\| theta < fChildThetaMin) {
	269	// printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax);
	270	return kFALSE;
	271	}
	272	//
	273	// rapidity cut
	274	if (y > fChildYMax \|\| y < fChildYMin) {
	275	// printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax);
	276	return kFALSE;
	277	}
	278	//
	279	// phi cut
	280	if (phi > fChildPhiMax \|\| phi < fChildPhiMin) {
281	// printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax);
282	return kFALSE;
283	}
284	}
285
e36044d6	286	return kTRUE;
	287	}
	288
65de9f86	289	Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
	290	{
	291	Bool_t Check ; // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance
	292	Int_t NumberOfPdgCodeParticleforAcceptanceCut=0;
	293	Int_t NumberOfAcceptedPdgCodeParticleforAcceptanceCut=0;
	294	TParticle * particle;
	295	Int_t i;
	296	for (i=0; i<np; i++) {
	297	particle = (TParticle *) particles->At(i);
	298	if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) {
	299	NumberOfPdgCodeParticleforAcceptanceCut++;
	300	if (fGeometryAcceptance->Impact(particle)) NumberOfAcceptedPdgCodeParticleforAcceptanceCut++;
	301	}
	302	}
	303	if ( NumberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) )
	304	Check = kTRUE;
	305	else
	306	Check = kFALSE;
	307
	308	return Check;
	309	}
	310
62d0ae06	311	Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const
e36044d6	312	{
	313	//
	314	// If the particle is in a diffractive state, then take action accordingly
	315	switch (pdgcode) {
	316	case 91:
	317	return 92;
	318	case 110:
	319	//rho_diff0 -- difficult to translate, return rho0
	320	return 113;
	321	case 210:
	322	//pi_diffr+ -- change to pi+
	323	return 211;
	324	case 220:
	325	//omega_di0 -- change to omega0
	326	return 223;
	327	case 330:
	328	//phi_diff0 -- return phi0
	329	return 333;
	330	case 440:
	331	//J/psi_di0 -- return J/psi
	332	return 443;
	333	case 2110:
	334	//n_diffr -- return neutron
	335	return 2112;
	336	case 2210:
	337	//p_diffr+ -- return proton
	338	return 2212;
	339	}
	340	//non diffractive state -- return code unchanged
	341	return pdgcode;
	342	}
3b945a60	343
	344	void AliGenMC::Boost(Float_t dy)
	345	{
	346	//
	347	// Boost cms into LHC lab frame
	348	//
	349
	350	Double_t beta = TMath::TanH(dy);
	351	Double_t gamma = 1./TMath::Sqrt(1.-beta*beta);
	352	Double_t gb = gamma * beta;
	353
	354	printf("\n Boosting particles to lab frame %f %f %f", dy, beta, gamma);
	355
	356	Int_t i;
	357	Int_t np = fParticles->GetEntriesFast();
	358	for (i = 0; i < np; i++)
	359	{
	360	TParticle* iparticle = (TParticle*) fParticles->At(i);
	361
	362	Double_t e = iparticle->Energy();
	363	Double_t px = iparticle->Px();
	364	Double_t py = iparticle->Py();
	365	Double_t pz = iparticle->Pz();
	366
	367	Double_t eb = gamma * e - gb * pz;
	368	Double_t pzb = -gb * e + gamma * pz;
	369
	370	iparticle->SetMomentum(px, py, pzb, eb);
	371	}
	372	}
	373
	374
e36044d6	375
	376	AliGenMC& AliGenMC::operator=(const AliGenMC& rhs)
	377	{
	378	// Assignment operator
	379	return *this;
	380	}
	381