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