[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.                  *
 **************************************************************************/

/*
$Log$
*/

#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();
    ForceDecay();
    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;
    }
}

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