[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 1.4  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.

*/

#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 kAll:
    case kNoDecay:
	break;
    }
}


Bool_t AliGenMC::ParentSelected(Int_t ip)
{
// True if particle is in list of parent particles to be selected
    for (Int_t i=0; i<8; i++)
    {
	if (fParentSelect[i]==ip) return kTRUE;
    }
    return kFALSE;
}

Bool_t AliGenMC::ChildSelected(Int_t ip)
{
// True if particle is in list of decay products to be selected
    for (Int_t i=0; i<5; i++)
    {
	if (fChildSelect[i]==ip) return kTRUE;
    }
    return kFALSE;
}

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