[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 1.13  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();
}

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