[u/mrichter/AliRoot.git] / EVGEN / AliGenPythia.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 1.12  1999/11/03 17:43:20  fca
New version from G.Martinez & A.Morsch

Revision 1.11  1999/09/29 09:24:14  fca
Introduction of the Copyright and cvs Log
*/

#include "AliGenerator.h"
#include "AliGenPythia.h"
#include "AliRun.h"
#include "AliPythia.h"
#include <TDirectory.h>
#include <TFile.h>
#include <TTree.h>
#include <stdlib.h>
#include <AliPythia.h>
#include <TParticle.h>
//#include <GParticle.h>
 ClassImp(AliGenPythia)

AliGenPythia::AliGenPythia()
                 :AliGenerator()
{
}

AliGenPythia::AliGenPythia(Int_t npart)
                 :AliGenerator(npart)
{
// default charm production at 5. 5 TeV
// semimuonic decay
// structure function GRVHO
//
    fXsection  = 0.;
    fParentSelect.Set(5);
    fChildSelect.Set(5);
    for (Int_t i=0; i<5; i++) fParentSelect[i]=fChildSelect[i]=0;
    SetProcess();
    SetStrucFunc();
    SetForceDecay();
    SetPtHard();
    SetEnergyCMS();
}

AliGenPythia::~AliGenPythia()
{
}

void AliGenPythia::Init()
{
    SetMC(new AliPythia());
    fPythia=(AliPythia*) fgMCEvGen;
//
    fParentWeight=1./Float_t(fNpart);
//
//  Forward Paramters to the AliPythia object
    fPythia->DefineParticles();
    fPythia->SetCKIN(3,fPtHardMin);
    fPythia->SetCKIN(4,fPtHardMax);    
    fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
    fPythia->ForceDecay(fForceDecay);
    fPythia->Lulist(0);
    fPythia->Pystat(2);
//  Parent and Children Selection
    switch (fProcess) 
    {
    case charm:

	fParentSelect[0]=411;
	fParentSelect[1]=421;
	fParentSelect[2]=431;
	fParentSelect[3]=4122;	
	break;
    case charm_unforced:

	fParentSelect[0]=411;
	fParentSelect[1]=421;
	fParentSelect[2]=431;
	fParentSelect[3]=4122;	
	break;
    case beauty:
	fParentSelect[0]=511;
	fParentSelect[1]=521;
	fParentSelect[2]=531;
	fParentSelect[3]=5122;	
	break;
    case beauty_unforced:
	fParentSelect[0]=511;
	fParentSelect[1]=521;
	fParentSelect[2]=531;
	fParentSelect[3]=5122;	
	break;
    case jpsi_chi:
    case jpsi:
	fParentSelect[0]=443;
	break;
    case mb:
	break;
    }

    switch (fForceDecay) 
    {
    case semielectronic:
    case dielectron:
    case b_jpsi_dielectron:
    case b_psip_dielectron:
	fChildSelect[0]=11;	
	break;
    case semimuonic:
    case dimuon:
    case b_jpsi_dimuon:
    case b_psip_dimuon:
    case pitomu:
    case katomu:
	fChildSelect[0]=13;
	break;
    case all:
    case nodecay:
	break;
    }
}

void AliGenPythia::Generate()
{

    Float_t polar[3] =   {0,0,0};
    Float_t origin[3]=   {0,0,0};
    Float_t origin_p[3]= {0,0,0};
    Float_t origin0[3]=  {0,0,0};
    Float_t p[3], p_p[4], random[6];
    static TClonesArray *particles;
//  converts from mm/c to s
    const Float_t kconv=0.001/2.999792458e8;
    
    
//
    Int_t nt=0;
    Int_t nt_p=0;
    Int_t jev=0;
    Int_t j, kf;

    if(!particles) particles=new TClonesArray("TParticle",1000);
    
    fTrials=0;
    for (j=0;j<3;j++) origin0[j]=fOrigin[j];
    if(fVertexSmear==perEvent) {
	gMC->Rndm(random,6);
	for (j=0;j<3;j++) {
	    origin0[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
		TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
	    fPythia->SetMSTP(151,0);
	}
    } else if (fVertexSmear==perTrack) {
	fPythia->SetMSTP(151,0);
	for (j=0;j<3;j++) {
	    fPythia->SetPARP(151+j, fOsigma[j]*10.);
	}
    }
    while(1)
    {
	fPythia->Pyevnt();
	fTrials++;
	fPythia->ImportParticles(particles,"All");
	Int_t np = particles->GetEntriesFast();
	printf("\n **************************************************%d\n",np);
	Int_t nc=0;
	if (np == 0 ) continue;
	if (fProcess != mb) {
	    for (Int_t i = 0; i<np; i++) {
		TParticle *  iparticle = (TParticle *) particles->At(i);
		kf = CheckPDGCode(iparticle->GetPdgCode());
		fChildWeight=(fPythia->GetBraPart(kf))*fParentWeight;	  
//
// Parent
		if (ParentSelected(TMath::Abs(kf))) {
		    if (KinematicSelection(iparticle)) {
			if (nc==0) {
//
// Store information concerning the hard scattering process
//
			    Float_t mass_p = fPythia->GetPARI(13);
			    Float_t   pt_p = fPythia->GetPARI(17);
			    Float_t    y_p = fPythia->GetPARI(37);
			    Float_t  xmt_p = sqrt(pt_p*pt_p+mass_p*mass_p);
			    Float_t     ty = Float_t(TMath::TanH(y_p));
			    p_p[0] = pt_p;
			    p_p[1] = 0;
			    p_p[2] = xmt_p*ty/sqrt(1.-ty*ty);
			    p_p[3] = mass_p;
			    gAlice->SetTrack(0,-1,-1,
					     p_p,origin_p,polar,
					     0,"Hard Scat.",nt_p,fParentWeight);
			    gAlice->KeepTrack(nt_p);
			}
			nc++;
//
// store parent track information
			p[0]=iparticle->Px();
			p[1]=iparticle->Py();
			p[2]=iparticle->Pz();
			origin[0]=origin0[0]+iparticle->Vx()/10;
			origin[1]=origin0[1]+iparticle->Vy()/10;
			origin[2]=origin0[2]+iparticle->Vz()/10;

			Int_t ifch=iparticle->GetFirstDaughter();
			Int_t ilch=iparticle->GetLastDaughter();	
			if (ifch !=0 && ilch !=0) {
			    gAlice->SetTrack(0,nt_p,kf,
					     p,origin,polar,
					     0,"Primary",nt,fParentWeight);
			    gAlice->KeepTrack(nt);
			    Int_t iparent = nt;
//
// Children	    

			    for (j=ifch; j<=ilch; j++)
			    {
				TParticle *  ichild = 
				    (TParticle *) particles->At(j-1);
				kf = CheckPDGCode(ichild->GetPdgCode());
//
// 
				if (ChildSelected(TMath::Abs(kf))) {
				    origin[0]=ichild->Vx();
				    origin[1]=ichild->Vy();
				    origin[2]=ichild->Vz();		
				    p[0]=ichild->Px();
				    p[1]=ichild->Py();
				    p[2]=ichild->Pz();
				    Float_t tof=kconv*ichild->T();
				    gAlice->SetTrack(fTrackIt, iparent, kf,
						     p,origin,polar,
						     tof,"Decay",nt,fChildWeight);
				    gAlice->KeepTrack(nt);
				} // select child
			    } // child loop
			}
		    } // kinematic selection
		} // select particle
	    } // particle loop
	} else {
	    for (Int_t i = 0; i<np; i++) {
		TParticle *  iparticle = (TParticle *) particles->At(i);
		kf = CheckPDGCode(iparticle->GetPdgCode());
		Int_t ks = iparticle->GetStatusCode();
		if (ks==1 && kf!=0 && KinematicSelection(iparticle)) {
			nc++;
//
// store track information
			p[0]=iparticle->Px();
			p[1]=iparticle->Py();
			p[2]=iparticle->Pz();
			origin[0]=origin0[0]+iparticle->Vx()/10;
			origin[1]=origin0[1]+iparticle->Vy()/10;
			origin[2]=origin0[2]+iparticle->Vz()/10;
			Float_t tof=kconv*iparticle->T();
			gAlice->SetTrack(fTrackIt,-1,kf,p,origin,polar,
					 tof,"Primary",nt);
			gAlice->KeepTrack(nt);
		} // select particle
	    } // particle loop 
	    printf("\n I've put %i particles on the stack \n",nc);
	} // mb ?
	if (nc > 0) {
	    jev+=nc;
	    if (jev >= fNpart) {
		fKineBias=Float_t(fNpart)/Float_t(fTrials);
		printf("\n Trials: %i\n",fTrials);
		break;
	    }
	}
    } // event loop
//  adjust weight due to kinematic selection
    AdjustWeights();
//  get cross-section
    fXsection=fPythia->GetPARI(1);
}

Bool_t AliGenPythia::ParentSelected(Int_t ip)
{
    for (Int_t i=0; i<5; i++)
    {
	if (fParentSelect[i]==ip) return kTRUE;
    }
    return kFALSE;
}

Bool_t AliGenPythia::ChildSelected(Int_t ip)
{
    for (Int_t i=0; i<5; i++)
    {
	if (fChildSelect[i]==ip) return kTRUE;
    }
    return kFALSE;
}

Bool_t AliGenPythia::KinematicSelection(TParticle *particle)
{
    Float_t px=particle->Px();
    Float_t py=particle->Py();
    Float_t pz=particle->Pz();
    Float_t  e=particle->Energy();

//
//  transverse momentum cut    
    Float_t pt=TMath::Sqrt(px*px+py*py);
    if (pt > fPtMax || pt < fPtMin) 
    {
//	printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
	return kFALSE;
    }
//
// momentum cut
    Float_t p=TMath::Sqrt(px*px+py*py+pz*pz);
    if (p > fPMax || p < fPMin) 
    {
//	printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	return kFALSE;
    }
    
//
// theta cut
    Float_t  theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(pz)));
    if (theta > fThetaMax || theta < fThetaMin) 
    {
//	printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	return kFALSE;
    }

//
// rapidity cut
    Float_t y = 0.5*TMath::Log((e+pz)/(e-pz));
    if (y > fYMax || y < fYMin)
    {
//	printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
	return kFALSE;
    }

//
// phi cut
    Float_t phi=Float_t(TMath::ATan2(Double_t(py),Double_t(px)))+TMath::Pi();
    if (phi > fPhiMax || phi < fPhiMin)
    {
//	printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
	return kFALSE;
    }

    return kTRUE;
}
void AliGenPythia::AdjustWeights()
{
    TClonesArray *PartArray = gAlice->Particles();
    TParticle *Part;
    Int_t ntrack=gAlice->GetNtrack();
    for (Int_t i=0; i<ntrack; i++) {
	Part= (TParticle*) PartArray->UncheckedAt(i);
	Part->SetWeight(Part->GetWeight()*fKineBias);
    }
}

Int_t AliGenPythia::CheckPDGCode(Int_t pdgcode)
{
//
//  If the particle is in a diffractive state, then take action accordigly
  switch (pdgcode) {
  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;
}
Commit	Line	Data
4c039060	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	$Log$
084c1b4a	18	Revision 1.12 1999/11/03 17:43:20 fca
	19	New version from G.Martinez & A.Morsch
	20
886b6f73	21	Revision 1.11 1999/09/29 09:24:14 fca
886b6f73	22	Introduction of the Copyright and cvs Log
4c039060	23	*/
4c039060	24
fe4da5cc	25	#include "AliGenerator.h"
fe4da5cc	26	#include "AliGenPythia.h"
fe4da5cc	27	#include "AliRun.h"
	28	#include "AliPythia.h"
	29	#include <TDirectory.h>
	30	#include <TFile.h>
	31	#include <TTree.h>
	32	#include <stdlib.h>
	33	#include <AliPythia.h>
1578254f	34	#include <TParticle.h>
1578254f	35	//#include <GParticle.h>
fe4da5cc	36	ClassImp(AliGenPythia)
	37
	38	AliGenPythia::AliGenPythia()
	39	:AliGenerator()
	40	{
	41	}
	42
	43	AliGenPythia::AliGenPythia(Int_t npart)
	44	:AliGenerator(npart)
	45	{
	46	// default charm production at 5. 5 TeV
	47	// semimuonic decay
	48	// structure function GRVHO
	49	//
	50	fXsection = 0.;
	51	fParentSelect.Set(5);
	52	fChildSelect.Set(5);
	53	for (Int_t i=0; i<5; i++) fParentSelect[i]=fChildSelect[i]=0;
	54	SetProcess();
	55	SetStrucFunc();
886b6f73	56	SetForceDecay();
fe4da5cc	57	SetPtHard();
	58	SetEnergyCMS();
	59	}
	60
	61	AliGenPythia::~AliGenPythia()
	62	{
	63	}
	64
	65	void AliGenPythia::Init()
	66	{
	67	SetMC(new AliPythia());
	68	fPythia=(AliPythia*) fgMCEvGen;
	69	//
	70	fParentWeight=1./Float_t(fNpart);
	71	//
	72	// Forward Paramters to the AliPythia object
	73	fPythia->DefineParticles();
fe4da5cc	74	fPythia->SetCKIN(3,fPtHardMin);
	75	fPythia->SetCKIN(4,fPtHardMax);
	76	fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
5be1fe76	77	fPythia->ForceDecay(fForceDecay);
084c1b4a	78	fPythia->Lulist(0);
084c1b4a	79	fPythia->Pystat(2);
fe4da5cc	80	// Parent and Children Selection
	81	switch (fProcess)
	82	{
	83	case charm:
	84
	85	fParentSelect[0]=411;
	86	fParentSelect[1]=421;
	87	fParentSelect[2]=431;
	88	fParentSelect[3]=4122;
	89	break;
	90	case charm_unforced:
	91
	92	fParentSelect[0]=411;
	93	fParentSelect[1]=421;
	94	fParentSelect[2]=431;
	95	fParentSelect[3]=4122;
	96	break;
	97	case beauty:
	98	fParentSelect[0]=511;
	99	fParentSelect[1]=521;
	100	fParentSelect[2]=531;
	101	fParentSelect[3]=5122;
	102	break;
	103	case beauty_unforced:
	104	fParentSelect[0]=511;
	105	fParentSelect[1]=521;
	106	fParentSelect[2]=531;
	107	fParentSelect[3]=5122;
	108	break;
	109	case jpsi_chi:
	110	case jpsi:
	111	fParentSelect[0]=443;
	112	break;
5be1fe76	113	case mb:
5be1fe76	114	break;
fe4da5cc	115	}
	116
	117	switch (fForceDecay)
	118	{
	119	case semielectronic:
	120	case dielectron:
	121	case b_jpsi_dielectron:
	122	case b_psip_dielectron:
	123	fChildSelect[0]=11;
	124	break;
	125	case semimuonic:
	126	case dimuon:
	127	case b_jpsi_dimuon:
	128	case b_psip_dimuon:
5be1fe76	129	case pitomu:
5be1fe76	130	case katomu:
fe4da5cc	131	fChildSelect[0]=13;
fe4da5cc	132	break;
886b6f73	133	case all:
	134	case nodecay:
	135	break;
fe4da5cc	136	}
	137	}
	138
	139	void AliGenPythia::Generate()
	140	{
fe4da5cc	141
5be1fe76	142	Float_t polar[3] = {0,0,0};
	143	Float_t origin[3]= {0,0,0};
	144	Float_t origin_p[3]= {0,0,0};
	145	Float_t origin0[3]= {0,0,0};
	146	Float_t p[3], p_p[4], random[6];
09fd3ea2	147	static TClonesArray *particles;
5be1fe76	148	// converts from mm/c to s
5be1fe76	149	const Float_t kconv=0.001/2.999792458e8;
fe4da5cc	150
	151
	152	//
fe4da5cc	153	Int_t nt=0;
5be1fe76	154	Int_t nt_p=0;
fe4da5cc	155	Int_t jev=0;
7921755b	156	Int_t j, kf;
09fd3ea2	157
09fd3ea2	158	if(!particles) particles=new TClonesArray("TParticle",1000);
fe4da5cc	159
	160	fTrials=0;
	161	for (j=0;j<3;j++) origin0[j]=fOrigin[j];
	162	if(fVertexSmear==perEvent) {
cfce8870	163	gMC->Rndm(random,6);
fe4da5cc	164	for (j=0;j<3;j++) {
	165	origin0[j]+=fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
	166	TMath::Sqrt(-2TMath::Log(random[2j+1]));
	167	fPythia->SetMSTP(151,0);
	168	}
	169	} else if (fVertexSmear==perTrack) {
	170	fPythia->SetMSTP(151,0);
	171	for (j=0;j<3;j++) {
	172	fPythia->SetPARP(151+j, fOsigma[j]*10.);
	173	}
	174	}
fe4da5cc	175	while(1)
fe4da5cc	176	{
084c1b4a	177	fPythia->Pyevnt();
fe4da5cc	178	fTrials++;
f1092809	179	fPythia->ImportParticles(particles,"All");
fe4da5cc	180	Int_t np = particles->GetEntriesFast();
	181	printf("\n **************************************************%d\n",np);
	182	Int_t nc=0;
	183	if (np == 0 ) continue;
5be1fe76	184	if (fProcess != mb) {
5be1fe76	185	for (Int_t i = 0; i<np; i++) {
1578254f	186	TParticle * iparticle = (TParticle *) particles->At(i);
a8228d85	187	kf = CheckPDGCode(iparticle->GetPdgCode());
5be1fe76	188	fChildWeight=(fPythia->GetBraPart(kf))*fParentWeight;
fe4da5cc	189	//
fe4da5cc	190	// Parent
5be1fe76	191	if (ParentSelected(TMath::Abs(kf))) {
	192	if (KinematicSelection(iparticle)) {
	193	if (nc==0) {
	194	//
	195	// Store information concerning the hard scattering process
	196	//
	197	Float_t mass_p = fPythia->GetPARI(13);
	198	Float_t pt_p = fPythia->GetPARI(17);
	199	Float_t y_p = fPythia->GetPARI(37);
	200	Float_t xmt_p = sqrt(pt_ppt_p+mass_pmass_p);
	201	Float_t ty = Float_t(TMath::TanH(y_p));
	202	p_p[0] = pt_p;
	203	p_p[1] = 0;
	204	p_p[2] = xmt_pty/sqrt(1.-tyty);
	205	p_p[3] = mass_p;
	206	gAlice->SetTrack(0,-1,-1,
	207	p_p,origin_p,polar,
	208	0,"Hard Scat.",nt_p,fParentWeight);
	209	gAlice->KeepTrack(nt_p);
	210	}
	211	nc++;
fe4da5cc	212	//
fe4da5cc	213	// store parent track information
1578254f	214	p[0]=iparticle->Px();
	215	p[1]=iparticle->Py();
	216	p[2]=iparticle->Pz();
	217	origin[0]=origin0[0]+iparticle->Vx()/10;
	218	origin[1]=origin0[1]+iparticle->Vy()/10;
	219	origin[2]=origin0[2]+iparticle->Vz()/10;
fe4da5cc	220
1578254f	221	Int_t ifch=iparticle->GetFirstDaughter();
1578254f	222	Int_t ilch=iparticle->GetLastDaughter();
5be1fe76	223	if (ifch !=0 && ilch !=0) {
1578254f	224	gAlice->SetTrack(0,nt_p,kf,
5be1fe76	225	p,origin,polar,
	226	0,"Primary",nt,fParentWeight);
	227	gAlice->KeepTrack(nt);
	228	Int_t iparent = nt;
fe4da5cc	229	//
	230	// Children
	231
7921755b	232	for (j=ifch; j<=ilch; j++)
5be1fe76	233	{
1578254f	234	TParticle * ichild =
1578254f	235	(TParticle *) particles->At(j-1);
a8228d85	236	kf = CheckPDGCode(ichild->GetPdgCode());
fe4da5cc	237	//
fe4da5cc	238	//
5be1fe76	239	if (ChildSelected(TMath::Abs(kf))) {
1578254f	240	origin[0]=ichild->Vx();
	241	origin[1]=ichild->Vy();
	242	origin[2]=ichild->Vz();
	243	p[0]=ichild->Px();
	244	p[1]=ichild->Py();
	245	p[2]=ichild->Pz();
	246	Float_t tof=kconv*ichild->T();
	247	gAlice->SetTrack(fTrackIt, iparent, kf,
5be1fe76	248	p,origin,polar,
	249	tof,"Decay",nt,fChildWeight);
	250	gAlice->KeepTrack(nt);
	251	} // select child
	252	} // child loop
	253	}
	254	} // kinematic selection
	255	} // select particle
	256	} // particle loop
	257	} else {
	258	for (Int_t i = 0; i<np; i++) {
1578254f	259	TParticle * iparticle = (TParticle *) particles->At(i);
a8228d85	260	kf = CheckPDGCode(iparticle->GetPdgCode());
1578254f	261	Int_t ks = iparticle->GetStatusCode();
1578254f	262	if (ks==1 && kf!=0 && KinematicSelection(iparticle)) {
5be1fe76	263	nc++;
	264	//
	265	// store track information
1578254f	266	p[0]=iparticle->Px();
	267	p[1]=iparticle->Py();
	268	p[2]=iparticle->Pz();
	269	origin[0]=origin0[0]+iparticle->Vx()/10;
	270	origin[1]=origin0[1]+iparticle->Vy()/10;
	271	origin[2]=origin0[2]+iparticle->Vz()/10;
	272	Float_t tof=kconv*iparticle->T();
	273	gAlice->SetTrack(fTrackIt,-1,kf,p,origin,polar,
5be1fe76	274	tof,"Primary",nt);
	275	gAlice->KeepTrack(nt);
	276	} // select particle
	277	} // particle loop
	278	printf("\n I've put %i particles on the stack \n",nc);
	279	} // mb ?
fe4da5cc	280	if (nc > 0) {
5be1fe76	281	jev+=nc;
fe4da5cc	282	if (jev >= fNpart) {
	283	fKineBias=Float_t(fNpart)/Float_t(fTrials);
	284	printf("\n Trials: %i\n",fTrials);
	285	break;
	286	}
	287	}
	288	} // event loop
	289	// adjust weight due to kinematic selection
	290	AdjustWeights();
	291	// get cross-section
	292	fXsection=fPythia->GetPARI(1);
	293	}
	294
	295	Bool_t AliGenPythia::ParentSelected(Int_t ip)
	296	{
	297	for (Int_t i=0; i<5; i++)
	298	{
	299	if (fParentSelect[i]==ip) return kTRUE;
	300	}
	301	return kFALSE;
	302	}
	303
	304	Bool_t AliGenPythia::ChildSelected(Int_t ip)
	305	{
	306	for (Int_t i=0; i<5; i++)
	307	{
	308	if (fChildSelect[i]==ip) return kTRUE;
	309	}
	310	return kFALSE;
	311	}
	312
1578254f	313	Bool_t AliGenPythia::KinematicSelection(TParticle *particle)
fe4da5cc	314	{
1578254f	315	Float_t px=particle->Px();
	316	Float_t py=particle->Py();
	317	Float_t pz=particle->Pz();
	318	Float_t e=particle->Energy();
fe4da5cc	319
	320	//
	321	// transverse momentum cut
	322	Float_t pt=TMath::Sqrt(pxpx+pypy);
	323	if (pt > fPtMax \|\| pt < fPtMin)
	324	{
	325	// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
	326	return kFALSE;
	327	}
	328	//
	329	// momentum cut
	330	Float_t p=TMath::Sqrt(pxpx+pypy+pz*pz);
	331	if (p > fPMax \|\| p < fPMin)
	332	{
	333	// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	334	return kFALSE;
	335	}
	336
	337	//
	338	// theta cut
5be1fe76	339	Float_t theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(pz)));
fe4da5cc	340	if (theta > fThetaMax \|\| theta < fThetaMin)
	341	{
	342	// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	343	return kFALSE;
	344	}
	345
	346	//
	347	// rapidity cut
	348	Float_t y = 0.5*TMath::Log((e+pz)/(e-pz));
	349	if (y > fYMax \|\| y < fYMin)
	350	{
	351	// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
	352	return kFALSE;
	353	}
	354
	355	//
	356	// phi cut
	357	Float_t phi=Float_t(TMath::ATan2(Double_t(py),Double_t(px)))+TMath::Pi();
	358	if (phi > fPhiMax \|\| phi < fPhiMin)
	359	{
	360	// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
	361	return kFALSE;
	362	}
	363
	364	return kTRUE;
	365	}
	366	void AliGenPythia::AdjustWeights()
	367	{
	368	TClonesArray *PartArray = gAlice->Particles();
1578254f	369	TParticle *Part;
fe4da5cc	370	Int_t ntrack=gAlice->GetNtrack();
fe4da5cc	371	for (Int_t i=0; i<ntrack; i++) {
1578254f	372	Part= (TParticle*) PartArray->UncheckedAt(i);
1578254f	373	Part->SetWeight(Part->GetWeight()*fKineBias);
fe4da5cc	374	}
	375	}
	376
a8228d85	377	Int_t AliGenPythia::CheckPDGCode(Int_t pdgcode)
	378	{
	379	//
	380	// If the particle is in a diffractive state, then take action accordigly
	381	switch (pdgcode) {
	382	case 110:
	383	//rho_diff0 -- difficult to translate, return rho0
	384	return 113;
	385	case 210:
	386	//pi_diffr+ -- change to pi+
	387	return 211;
	388	case 220:
	389	//omega_di0 -- change to omega0
	390	return 223;
	391	case 330:
	392	//phi_diff0 -- return phi0
	393	return 333;
	394	case 440:
	395	//J/psi_di0 -- return J/psi
	396	return 443;
	397	case 2110:
	398	//n_diffr -- return neutron
	399	return 2112;
	400	case 2210:
	401	//p_diffr+ -- return proton
	402	return 2212;
	403	}
	404	//non diffractive state -- return code unchanged
	405	return pdgcode;
	406	}
	407
fe4da5cc	408
	409
	410
	411
5be1fe76	412
	413
	414
	415