[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 1.8  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 "AliGenMC.h"
#include "AliPDG.h"
#include <TMath.h>
#include <TParticle.h>

 ClassImp(AliGenMC)

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

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();
}

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