[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 1.6  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 <TParticle.h>

 ClassImp(AliGenMC)

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

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();
}

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:
	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;
}

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