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