[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  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.

*/

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