[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 1.14  2000/04/05 08:36:13  morsch
Check status code of particles in Pythia event
to avoid double counting as partonic state and final state particle.

Revision 1.13  1999/11/09 07:38:48  fca
Changes for compatibility with version 2.23 of ROOT

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();
	fPythia->Lulist(1);
	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-1; i++) {
		TParticle *  iparticle = (TParticle *) particles->At(i);
		Int_t ks = iparticle->GetStatusCode();
		kf = CheckPDGCode(iparticle->GetPdgCode());
		if (ks==21) continue;

		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-1; 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 %i %i\n",fTrials, fNpart, jev);
		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 accordingly
  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	$Log$
2a0e6f5b	18	Revision 1.14 2000/04/05 08:36:13 morsch
	19	Check status code of particles in Pythia event
	20	to avoid double counting as partonic state and final state particle.
	21
23211d3e	22	Revision 1.13 1999/11/09 07:38:48 fca
	23	Changes for compatibility with version 2.23 of ROOT
	24
084c1b4a	25	Revision 1.12 1999/11/03 17:43:20 fca
	26	New version from G.Martinez & A.Morsch
	27
886b6f73	28	Revision 1.11 1999/09/29 09:24:14 fca
886b6f73	29	Introduction of the Copyright and cvs Log
4c039060	30	*/
4c039060	31
fe4da5cc	32	#include "AliGenerator.h"
fe4da5cc	33	#include "AliGenPythia.h"
fe4da5cc	34	#include "AliRun.h"
	35	#include "AliPythia.h"
	36	#include <TDirectory.h>
	37	#include <TFile.h>
	38	#include <TTree.h>
	39	#include <stdlib.h>
	40	#include <AliPythia.h>
1578254f	41	#include <TParticle.h>
1578254f	42	//#include <GParticle.h>
fe4da5cc	43	ClassImp(AliGenPythia)
	44
	45	AliGenPythia::AliGenPythia()
	46	:AliGenerator()
	47	{
	48	}
	49
	50	AliGenPythia::AliGenPythia(Int_t npart)
	51	:AliGenerator(npart)
	52	{
	53	// default charm production at 5. 5 TeV
	54	// semimuonic decay
	55	// structure function GRVHO
	56	//
	57	fXsection = 0.;
	58	fParentSelect.Set(5);
	59	fChildSelect.Set(5);
	60	for (Int_t i=0; i<5; i++) fParentSelect[i]=fChildSelect[i]=0;
	61	SetProcess();
	62	SetStrucFunc();
886b6f73	63	SetForceDecay();
fe4da5cc	64	SetPtHard();
	65	SetEnergyCMS();
	66	}
	67
	68	AliGenPythia::~AliGenPythia()
	69	{
	70	}
	71
	72	void AliGenPythia::Init()
	73	{
	74	SetMC(new AliPythia());
	75	fPythia=(AliPythia*) fgMCEvGen;
	76	//
	77	fParentWeight=1./Float_t(fNpart);
	78	//
	79	// Forward Paramters to the AliPythia object
	80	fPythia->DefineParticles();
fe4da5cc	81	fPythia->SetCKIN(3,fPtHardMin);
	82	fPythia->SetCKIN(4,fPtHardMax);
	83	fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
5be1fe76	84	fPythia->ForceDecay(fForceDecay);
084c1b4a	85	fPythia->Lulist(0);
084c1b4a	86	fPythia->Pystat(2);
fe4da5cc	87	// Parent and Children Selection
	88	switch (fProcess)
	89	{
	90	case charm:
	91
	92	fParentSelect[0]=411;
	93	fParentSelect[1]=421;
	94	fParentSelect[2]=431;
	95	fParentSelect[3]=4122;
	96	break;
	97	case charm_unforced:
	98
	99	fParentSelect[0]=411;
	100	fParentSelect[1]=421;
	101	fParentSelect[2]=431;
	102	fParentSelect[3]=4122;
	103	break;
	104	case beauty:
	105	fParentSelect[0]=511;
	106	fParentSelect[1]=521;
	107	fParentSelect[2]=531;
	108	fParentSelect[3]=5122;
	109	break;
	110	case beauty_unforced:
	111	fParentSelect[0]=511;
	112	fParentSelect[1]=521;
	113	fParentSelect[2]=531;
	114	fParentSelect[3]=5122;
	115	break;
	116	case jpsi_chi:
	117	case jpsi:
	118	fParentSelect[0]=443;
	119	break;
5be1fe76	120	case mb:
5be1fe76	121	break;
fe4da5cc	122	}
	123
	124	switch (fForceDecay)
	125	{
	126	case semielectronic:
	127	case dielectron:
	128	case b_jpsi_dielectron:
	129	case b_psip_dielectron:
	130	fChildSelect[0]=11;
	131	break;
	132	case semimuonic:
	133	case dimuon:
	134	case b_jpsi_dimuon:
	135	case b_psip_dimuon:
5be1fe76	136	case pitomu:
5be1fe76	137	case katomu:
fe4da5cc	138	fChildSelect[0]=13;
fe4da5cc	139	break;
886b6f73	140	case all:
	141	case nodecay:
	142	break;
fe4da5cc	143	}
	144	}
	145
	146	void AliGenPythia::Generate()
	147	{
fe4da5cc	148
5be1fe76	149	Float_t polar[3] = {0,0,0};
	150	Float_t origin[3]= {0,0,0};
	151	Float_t origin_p[3]= {0,0,0};
	152	Float_t origin0[3]= {0,0,0};
	153	Float_t p[3], p_p[4], random[6];
09fd3ea2	154	static TClonesArray *particles;
5be1fe76	155	// converts from mm/c to s
5be1fe76	156	const Float_t kconv=0.001/2.999792458e8;
fe4da5cc	157
	158
	159	//
fe4da5cc	160	Int_t nt=0;
5be1fe76	161	Int_t nt_p=0;
fe4da5cc	162	Int_t jev=0;
7921755b	163	Int_t j, kf;
09fd3ea2	164
09fd3ea2	165	if(!particles) particles=new TClonesArray("TParticle",1000);
fe4da5cc	166
	167	fTrials=0;
	168	for (j=0;j<3;j++) origin0[j]=fOrigin[j];
	169	if(fVertexSmear==perEvent) {
cfce8870	170	gMC->Rndm(random,6);
fe4da5cc	171	for (j=0;j<3;j++) {
	172	origin0[j]+=fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
	173	TMath::Sqrt(-2TMath::Log(random[2j+1]));
	174	fPythia->SetMSTP(151,0);
	175	}
	176	} else if (fVertexSmear==perTrack) {
	177	fPythia->SetMSTP(151,0);
	178	for (j=0;j<3;j++) {
	179	fPythia->SetPARP(151+j, fOsigma[j]*10.);
	180	}
	181	}
fe4da5cc	182	while(1)
fe4da5cc	183	{
084c1b4a	184	fPythia->Pyevnt();
2a0e6f5b	185	fPythia->Lulist(1);
fe4da5cc	186	fTrials++;
f1092809	187	fPythia->ImportParticles(particles,"All");
fe4da5cc	188	Int_t np = particles->GetEntriesFast();
	189	printf("\n **************************************************%d\n",np);
	190	Int_t nc=0;
	191	if (np == 0 ) continue;
5be1fe76	192	if (fProcess != mb) {
2a0e6f5b	193	for (Int_t i = 0; i<np-1; i++) {
1578254f	194	TParticle * iparticle = (TParticle *) particles->At(i);
23211d3e	195	Int_t ks = iparticle->GetStatusCode();
a8228d85	196	kf = CheckPDGCode(iparticle->GetPdgCode());
2a0e6f5b	197	if (ks==21) continue;
2a0e6f5b	198
5be1fe76	199	fChildWeight=(fPythia->GetBraPart(kf))*fParentWeight;
fe4da5cc	200	//
fe4da5cc	201	// Parent
5be1fe76	202	if (ParentSelected(TMath::Abs(kf))) {
	203	if (KinematicSelection(iparticle)) {
	204	if (nc==0) {
	205	//
	206	// Store information concerning the hard scattering process
	207	//
	208	Float_t mass_p = fPythia->GetPARI(13);
	209	Float_t pt_p = fPythia->GetPARI(17);
	210	Float_t y_p = fPythia->GetPARI(37);
	211	Float_t xmt_p = sqrt(pt_ppt_p+mass_pmass_p);
	212	Float_t ty = Float_t(TMath::TanH(y_p));
	213	p_p[0] = pt_p;
	214	p_p[1] = 0;
	215	p_p[2] = xmt_pty/sqrt(1.-tyty);
	216	p_p[3] = mass_p;
	217	gAlice->SetTrack(0,-1,-1,
	218	p_p,origin_p,polar,
	219	0,"Hard Scat.",nt_p,fParentWeight);
	220	gAlice->KeepTrack(nt_p);
	221	}
	222	nc++;
fe4da5cc	223	//
fe4da5cc	224	// store parent track information
1578254f	225	p[0]=iparticle->Px();
	226	p[1]=iparticle->Py();
	227	p[2]=iparticle->Pz();
	228	origin[0]=origin0[0]+iparticle->Vx()/10;
	229	origin[1]=origin0[1]+iparticle->Vy()/10;
	230	origin[2]=origin0[2]+iparticle->Vz()/10;
fe4da5cc	231
1578254f	232	Int_t ifch=iparticle->GetFirstDaughter();
1578254f	233	Int_t ilch=iparticle->GetLastDaughter();
5be1fe76	234	if (ifch !=0 && ilch !=0) {
1578254f	235	gAlice->SetTrack(0,nt_p,kf,
5be1fe76	236	p,origin,polar,
	237	0,"Primary",nt,fParentWeight);
	238	gAlice->KeepTrack(nt);
	239	Int_t iparent = nt;
fe4da5cc	240	//
	241	// Children
	242
7921755b	243	for (j=ifch; j<=ilch; j++)
5be1fe76	244	{
1578254f	245	TParticle * ichild =
1578254f	246	(TParticle *) particles->At(j-1);
a8228d85	247	kf = CheckPDGCode(ichild->GetPdgCode());
fe4da5cc	248	//
fe4da5cc	249	//
5be1fe76	250	if (ChildSelected(TMath::Abs(kf))) {
1578254f	251	origin[0]=ichild->Vx();
	252	origin[1]=ichild->Vy();
	253	origin[2]=ichild->Vz();
	254	p[0]=ichild->Px();
	255	p[1]=ichild->Py();
	256	p[2]=ichild->Pz();
	257	Float_t tof=kconv*ichild->T();
	258	gAlice->SetTrack(fTrackIt, iparent, kf,
5be1fe76	259	p,origin,polar,
	260	tof,"Decay",nt,fChildWeight);
	261	gAlice->KeepTrack(nt);
	262	} // select child
	263	} // child loop
	264	}
	265	} // kinematic selection
	266	} // select particle
	267	} // particle loop
	268	} else {
2a0e6f5b	269	for (Int_t i = 0; i<np-1; i++) {
1578254f	270	TParticle * iparticle = (TParticle *) particles->At(i);
a8228d85	271	kf = CheckPDGCode(iparticle->GetPdgCode());
1578254f	272	Int_t ks = iparticle->GetStatusCode();
2a0e6f5b	273
1578254f	274	if (ks==1 && kf!=0 && KinematicSelection(iparticle)) {
5be1fe76	275	nc++;
	276	//
	277	// store track information
1578254f	278	p[0]=iparticle->Px();
	279	p[1]=iparticle->Py();
	280	p[2]=iparticle->Pz();
	281	origin[0]=origin0[0]+iparticle->Vx()/10;
	282	origin[1]=origin0[1]+iparticle->Vy()/10;
	283	origin[2]=origin0[2]+iparticle->Vz()/10;
	284	Float_t tof=kconv*iparticle->T();
	285	gAlice->SetTrack(fTrackIt,-1,kf,p,origin,polar,
5be1fe76	286	tof,"Primary",nt);
	287	gAlice->KeepTrack(nt);
	288	} // select particle
	289	} // particle loop
	290	printf("\n I've put %i particles on the stack \n",nc);
	291	} // mb ?
fe4da5cc	292	if (nc > 0) {
5be1fe76	293	jev+=nc;
fe4da5cc	294	if (jev >= fNpart) {
fe4da5cc	295	fKineBias=Float_t(fNpart)/Float_t(fTrials);
23211d3e	296	printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
fe4da5cc	297	break;
	298	}
	299	}
	300	} // event loop
	301	// adjust weight due to kinematic selection
	302	AdjustWeights();
	303	// get cross-section
	304	fXsection=fPythia->GetPARI(1);
	305	}
	306
	307	Bool_t AliGenPythia::ParentSelected(Int_t ip)
	308	{
	309	for (Int_t i=0; i<5; i++)
	310	{
	311	if (fParentSelect[i]==ip) return kTRUE;
	312	}
	313	return kFALSE;
	314	}
	315
	316	Bool_t AliGenPythia::ChildSelected(Int_t ip)
	317	{
	318	for (Int_t i=0; i<5; i++)
	319	{
	320	if (fChildSelect[i]==ip) return kTRUE;
	321	}
	322	return kFALSE;
	323	}
	324
1578254f	325	Bool_t AliGenPythia::KinematicSelection(TParticle *particle)
fe4da5cc	326	{
1578254f	327	Float_t px=particle->Px();
	328	Float_t py=particle->Py();
	329	Float_t pz=particle->Pz();
	330	Float_t e=particle->Energy();
fe4da5cc	331
	332	//
	333	// transverse momentum cut
	334	Float_t pt=TMath::Sqrt(pxpx+pypy);
	335	if (pt > fPtMax \|\| pt < fPtMin)
	336	{
	337	// printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax);
	338	return kFALSE;
	339	}
	340	//
	341	// momentum cut
	342	Float_t p=TMath::Sqrt(pxpx+pypy+pz*pz);
	343	if (p > fPMax \|\| p < fPMin)
	344	{
	345	// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	346	return kFALSE;
	347	}
	348
	349	//
	350	// theta cut
5be1fe76	351	Float_t theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(pz)));
fe4da5cc	352	if (theta > fThetaMax \|\| theta < fThetaMin)
	353	{
	354	// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	355	return kFALSE;
	356	}
	357
	358	//
	359	// rapidity cut
	360	Float_t y = 0.5*TMath::Log((e+pz)/(e-pz));
	361	if (y > fYMax \|\| y < fYMin)
	362	{
	363	// printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax);
	364	return kFALSE;
	365	}
	366
	367	//
	368	// phi cut
	369	Float_t phi=Float_t(TMath::ATan2(Double_t(py),Double_t(px)))+TMath::Pi();
	370	if (phi > fPhiMax \|\| phi < fPhiMin)
	371	{
	372	// printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax);
	373	return kFALSE;
	374	}
	375
	376	return kTRUE;
	377	}
	378	void AliGenPythia::AdjustWeights()
	379	{
	380	TClonesArray *PartArray = gAlice->Particles();
1578254f	381	TParticle *Part;
fe4da5cc	382	Int_t ntrack=gAlice->GetNtrack();
fe4da5cc	383	for (Int_t i=0; i<ntrack; i++) {
1578254f	384	Part= (TParticle*) PartArray->UncheckedAt(i);
1578254f	385	Part->SetWeight(Part->GetWeight()*fKineBias);
fe4da5cc	386	}
	387	}
	388
a8228d85	389	Int_t AliGenPythia::CheckPDGCode(Int_t pdgcode)
	390	{
	391	//
23211d3e	392	// If the particle is in a diffractive state, then take action accordingly
a8228d85	393	switch (pdgcode) {
	394	case 110:
	395	//rho_diff0 -- difficult to translate, return rho0
	396	return 113;
	397	case 210:
	398	//pi_diffr+ -- change to pi+
	399	return 211;
	400	case 220:
	401	//omega_di0 -- change to omega0
	402	return 223;
	403	case 330:
	404	//phi_diff0 -- return phi0
	405	return 333;
	406	case 440:
	407	//J/psi_di0 -- return J/psi
	408	return 443;
	409	case 2110:
	410	//n_diffr -- return neutron
	411	return 2112;
	412	case 2210:
	413	//p_diffr+ -- return proton
	414	return 2212;
	415	}
	416	//non diffractive state -- return code unchanged
	417	return pdgcode;
	418	}
	419
fe4da5cc	420
	421
	422
	423
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	427