[u/mrichter/AliRoot.git] / EVGEN / AliGenHIJINGparaBa.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.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////
// Parameterisation of pi, K, n and p eta and pt distributions   //
// eta: according to HIJING (shadowing + quenching)              //
// pT : according to CDF measurement at 1.8 TeV                  //
// Author: andreas.morsch@cern.ch                                //
//                                                               //
///////////////////////////////////////////////////////////////////

#include <TArrayF.h>
#include <TF1.h>
#include <TPDGCode.h>

#include "AliConst.h"
#include "AliGenEventHeader.h"
#include "AliGenHIJINGparaBa.h"
#include "AliRun.h"

ClassImp(AliGenHIJINGparaBa)


static Double_t ptpi(Double_t *px, Double_t *)
{
  //
  //     PT-PARAMETERIZATION CDF, PRL 61(88) 1819
  //     POWER LAW FOR PT > 500 MEV
  //     MT SCALING BELOW (T=160 MEV)
  //
  const Double_t kp0 = 1.3;
  const Double_t kxn = 8.28;
  const Double_t kxlim=0.5;
  const Double_t kt=0.160;
  const Double_t kxmpi=0.139;
  const Double_t kb=1.;
  Double_t y, y1, xmpi2, ynorm, a;
  Double_t x=*px;
  //
  y1=TMath::Power(kp0/(kp0+kxlim),kxn);
  xmpi2=kxmpi*kxmpi;
  ynorm=kb*(TMath::Exp(-sqrt(kxlim*kxlim+xmpi2)/kt));
  a=ynorm/y1;
  if (x > kxlim)
    y=a*TMath::Power(kp0/(kp0+x),kxn);
  else
    y=kb*TMath::Exp(-sqrt(x*x+xmpi2)/kt);
  return y*x;
}

//_____________________________________________________________________________
static Double_t ptscal(Double_t pt, Int_t np)
{
    //    SCALING EN MASSE PAR RAPPORT A PTPI
    //     MASS PI,K,ETA,RHO,OMEGA,ETA',PHI
    const Double_t khm[10] = {.13957,.493,.5488,.769,.7826,.958,1.02,0,0,0};
    //     VALUE MESON/PI AT 5 GEV
    const Double_t kfmax[10]={1.,0.3,0.55,1.0,1.0,1.0,1.0,0,0,0};
    np--;
    Double_t f5=TMath::Power(((
	sqrt(100.018215)+2.)/(sqrt(100.+khm[np]*khm[np])+2.0)),12.3);
    Double_t fmax2=f5/kfmax[np];
    // PIONS
    Double_t ptpion=100.*ptpi(&pt, (Double_t*) 0);
    Double_t fmtscal=TMath::Power(((
	sqrt(pt*pt+0.018215)+2.)/ (sqrt(pt*pt+khm[np]*khm[np])+2.0)),12.3)/ 
	fmax2;
    return fmtscal*ptpion;
}

//_____________________________________________________________________________
static Double_t ptka( Double_t *px, Double_t *)
{
    //
    // pt parametrisation for k
    //
    return ptscal(*px,2);
}


//_____________________________________________________________________________
static Double_t etapic( Double_t *py, Double_t *)
{
  //
  // eta parametrisation for pi
  //
    const Double_t ka1    = 4913.;
    const Double_t ka2    = 1819.;
    const Double_t keta1  = 0.22;
    const Double_t keta2  = 3.66;
    const Double_t kdeta1 = 1.47;
    const Double_t kdeta2 = 1.51;
    Double_t y=TMath::Abs(*py);
    //
    Double_t ex1 = (y-keta1)*(y-keta1)/(2*kdeta1*kdeta1);
    Double_t ex2 = (y-keta2)*(y-keta2)/(2*kdeta2*kdeta2);
    return ka1*TMath::Exp(-ex1)+ka2*TMath::Exp(-ex2);
}

//_____________________________________________________________________________
static Double_t etakac( Double_t *py, Double_t *)
{
    //
    // eta parametrisation for ka
    //
    const Double_t ka1    = 497.6;
    const Double_t ka2    = 215.6;
    const Double_t keta1  = 0.79;
    const Double_t keta2  = 4.09;
    const Double_t kdeta1 = 1.54;
    const Double_t kdeta2 = 1.40;
    Double_t y=TMath::Abs(*py);
    //
    Double_t ex1 = (y-keta1)*(y-keta1)/(2*kdeta1*kdeta1);
    Double_t ex2 = (y-keta2)*(y-keta2)/(2*kdeta2*kdeta2);
    return ka1*TMath::Exp(-ex1)+ka2*TMath::Exp(-ex2);
}

 static Double_t ptbaryon( Double_t *px, Double_t *)
{
// baryons
//                pt-distribution
//____________________________________________________________

  return ptscal(*px,7);  //  7==> Baryon in the PtScal function
}

 static Double_t etabaryon( Double_t *py, Double_t *)
{
// eta-distribution
//____________________________________________________________
    const Float_t  kp0 =  1.10343e+02;
    const Float_t  kp1 =  1.73247e+01;
    const Float_t  kp2 = -7.23808e+00;
    const Float_t  kp3 =  4.48334e-01;
    const Double_t ky = TMath::Abs(*py);
//
    return (kp0+kp1*ky+kp2*ky*ky+kp3*ky*ky*ky)/20.;
}

AliGenHIJINGparaBa::AliGenHIJINGparaBa()
    :AliGenHIJINGpara(),
     fPtba(0),
     fETAba(0)
{
    //
    // Default constructor
    //
    fName="HIGINGparaBa";
    fTitle="HIJING Parametrisation Particle Generator with Baryons";
}

//_____________________________________________________________________________
AliGenHIJINGparaBa::AliGenHIJINGparaBa(Int_t npart)
  :AliGenHIJINGpara(npart),
     fPtba(0),
     fETAba(0)
{
  // 
  // Standard constructor
  //
    fName="HIGINGparaBa";
    fTitle="HIJING Parametrisation Particle Generator with Baryons";
}

AliGenHIJINGparaBa::AliGenHIJINGparaBa(const AliGenHIJINGparaBa& para) : 
    AliGenHIJINGpara(para),
    fPtba(0),
    fETAba(0)									
{
// Copy constructor
    para.Copy(*this);
}

//_____________________________________________________________________________
AliGenHIJINGparaBa::~AliGenHIJINGparaBa()
{
  //
  // Standard destructor
  //
    delete fPtba;
    delete fETAba;
}

//_____________________________________________________________________________
void AliGenHIJINGparaBa::Init()
{
  //
  // Initialise the HIJING parametrisation
  //
    Float_t etaMin =-TMath::Log(TMath::Tan(
	TMath::Min((Double_t)fThetaMax/2,TMath::Pi()/2-1.e-10)));
    Float_t etaMax = -TMath::Log(TMath::Tan(
	TMath::Max((Double_t)fThetaMin/2,1.e-10)));
    fPtpi   = new TF1("ptpi",&ptpi,0,20,0);
    fPtka   = new TF1("ptka",&ptka,0,20,0);
    fPtba   = new TF1("ptbaryon",&ptbaryon,0,20,0);
    fETApic = new TF1("etapic",&etapic,etaMin,etaMax,0);
    fETAkac = new TF1("etakac",&etakac,etaMin,etaMax,0);
    fETAba  = new TF1("etabaryon",&etabaryon,etaMin,etaMax,0);

    TF1 etaPic0("etapic(-7,7)",&etapic,    -7, 7, 0);
    TF1 etaKac0("etakac(-7,7)",&etakac,    -7, 7, 0);
    TF1 etaBar0("etabar(-7,7)",&etabaryon, -7, 7, 0);
    
    TF1 ptPic0("ptpi(0,15)",  &ptpi,     0., 15., 0);
    TF1 ptKac0("ptka(0,15)",  &ptka,     0., 15., 0);
    TF1 ptBar0("ptbar(0,15)", &ptbaryon, 0., 15., 0);

    Float_t intETApi  = etaPic0.Integral(-0.5, 0.5);
    Float_t intETAka  = etaKac0.Integral(-0.5, 0.5);
    Float_t intETAba  = etaBar0.Integral(-0.5, 0.5);

    Float_t scalePi   = 6979./(intETApi/1.5);
    Float_t scaleKa   =  657./(intETAka/2.0);
    Float_t scaleBa   =  364./(intETAba/2.0);

//  Fraction of events corresponding to the selected pt-range    
    Float_t intPt    = (0.837*ptPic0.Integral(0, 15)+
			0.105*ptKac0.Integral(0, 15)+
                        0.058*ptBar0.Integral(0, 15));
    Float_t intPtSel = (0.837*ptPic0.Integral(fPtMin, fPtMax)+
			0.105*ptKac0.Integral(fPtMin, fPtMax)+
	                0.058*ptBar0.Integral(fPtMin, fPtMax));
    Float_t ptFrac   = intPtSel/intPt;

//  Fraction of events corresponding to the selected eta-range    
    Float_t intETASel  = (scalePi*etaPic0.Integral(etaMin, etaMax)+
			  scaleKa*etaKac0.Integral(etaMin, etaMax)+
	                  scaleBa*etaBar0.Integral(etaMin, etaMax));
//  Fraction of events corresponding to the selected phi-range    
    Float_t phiFrac    = (fPhiMax-fPhiMin)/2/TMath::Pi();

    fParentWeight = Float_t(fNpart)/(intETASel*ptFrac*phiFrac);
    
    printf("%s: The number of particles in the selected kinematic region corresponds to %f percent of a full event \n", 
	   ClassName(),100.*fParentWeight);

// Issue warning message if etaMin or etaMax are outside the alowed range 
// of the parametrization
    if (etaMin < -8.001 || etaMax > 8.001) {
	printf("\n \n WARNING FROM AliGenHIJINGParaBa !");
	printf("\n YOU ARE USING THE PARAMETERISATION OUTSIDE ");	
	printf("\n THE ALLOWED PSEUDORAPIDITY RANGE (-8. - 8.)");	    
	printf("\n YOUR LIMITS: %f %f \n \n ", etaMin, etaMax);
    }
}

//_____________________________________________________________________________
void AliGenHIJINGparaBa::Generate()
{
  //
  // Generate one trigger
  //

  
    const Float_t kBorne1 = 0.837;
    const Float_t kBorne2 = kBorne1+0.105;
    
    Float_t polar[3]= {0,0,0};
    //
    const Int_t kPions[3]   = {kPi0, kPiPlus, kPiMinus};
    const Int_t kKaons[4]   = {kK0Long, kK0Short, kKPlus, kKMinus};
    const Int_t kBaryons[4] = {kProton, kProtonBar, kNeutron, kNeutronBar};
    //
    Float_t origin[3];
    Float_t pt, pl, ptot;
    Float_t phi, theta;
    Float_t p[3];
    Int_t i, part, nt, j;
    //
    TF1 *ptf;
    TF1 *etaf;
    //
    Float_t random[6];
    //
    for (j=0;j<3;j++) origin[j]=fOrigin[j];

    if(fVertexSmear == kPerEvent) {
	Float_t dv[3];
	dv[2] = 1.e10;
	while(TMath::Abs(dv[2]) > fCutVertexZ*fOsigma[2]) {
	    Rndm(random,6);
	    for (j=0; j < 3; j++) {
		dv[j] = fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
		    TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
	    }
	}
	for (j=0; j < 3; j++) origin[j] += dv[j];
    } // if kPerEvent
    TArrayF eventVertex;
    eventVertex.Set(3);
    eventVertex[0] = origin[0];
    eventVertex[1] = origin[1];
    eventVertex[2] = origin[2];

    for(i=0;i<fNpart;i++) {
	while(1) {
	    Rndm(random,3);
	    if(random[0] < kBorne1) {
		part  = kPions[Int_t (random[1]*3)];
		ptf   = fPtpi;
		etaf  = fETApic;
	    } else if (random[0] < kBorne2) {
		part  = kKaons[Int_t (random[1]*4)];
		ptf   = fPtka;
		etaf  = fETAkac;
	    } else {
		part  = kBaryons[Int_t (random[1]*4)];
		ptf   = fPtba;
		etaf  = fETAba;
	    }
	    
	    phi=fPhiMin+random[2]*(fPhiMax-fPhiMin);
	    theta=2*TMath::ATan(TMath::Exp(-etaf->GetRandom()));
	    if(theta<fThetaMin || theta>fThetaMax) continue;
	    pt=ptf->GetRandom();
	    pl=pt/TMath::Tan(theta);
	    ptot=TMath::Sqrt(pt*pt+pl*pl);
	    if(ptot<fPMin || ptot>fPMax) continue;
	    p[0]=pt*TMath::Cos(phi);
	    p[1]=pt*TMath::Sin(phi);
	    p[2]=pl;
	    if(fVertexSmear==kPerTrack) {
		Rndm(random,6);
		for (j=0;j<3;j++) {
		    origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
			TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
		}
	    }
	    PushTrack(fTrackIt,-1,part,p,origin,polar,0,kPPrimary,nt,fParentWeight);
	    break;
	} // while(1)
    } // Particle loop
// Header
    AliGenEventHeader* header = new AliGenEventHeader("HIJINGparam");
// Event Vertex
    header->SetPrimaryVertex(eventVertex);
    gAlice->SetGenEventHeader(header); 
}
Commit	Line	Data
388f2c07	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
803d1ab0	16	/* $Id$ */
88cb7938	17
388f2c07	18	///////////////////////////////////////////////////////////////////
	19	// Parameterisation of pi, K, n and p eta and pt distributions //
	20	// eta: according to HIJING (shadowing + quenching) //
	21	// pT : according to CDF measurement at 1.8 TeV //
	22	// Author: andreas.morsch@cern.ch //
	23	// //
	24	///////////////////////////////////////////////////////////////////
	25
116cbefd	26	#include <TArrayF.h>
	27	#include <TF1.h>
	28	#include <TPDGCode.h>
	29
	30	#include "AliConst.h"
388f2c07	31	#include "AliGenEventHeader.h"
116cbefd	32	#include "AliGenHIJINGparaBa.h"
388f2c07	33	#include "AliRun.h"
388f2c07	34
	35	ClassImp(AliGenHIJINGparaBa)
	36
	37
	38	static Double_t ptpi(Double_t px, Double_t )
	39	{
	40	//
	41	// PT-PARAMETERIZATION CDF, PRL 61(88) 1819
	42	// POWER LAW FOR PT > 500 MEV
	43	// MT SCALING BELOW (T=160 MEV)
	44	//
	45	const Double_t kp0 = 1.3;
	46	const Double_t kxn = 8.28;
	47	const Double_t kxlim=0.5;
	48	const Double_t kt=0.160;
	49	const Double_t kxmpi=0.139;
	50	const Double_t kb=1.;
	51	Double_t y, y1, xmpi2, ynorm, a;
	52	Double_t x=*px;
	53	//
	54	y1=TMath::Power(kp0/(kp0+kxlim),kxn);
	55	xmpi2=kxmpi*kxmpi;
	56	ynorm=kb(TMath::Exp(-sqrt(kxlimkxlim+xmpi2)/kt));
	57	a=ynorm/y1;
	58	if (x > kxlim)
	59	y=a*TMath::Power(kp0/(kp0+x),kxn);
	60	else
	61	y=kbTMath::Exp(-sqrt(xx+xmpi2)/kt);
	62	return y*x;
	63	}
	64
	65	//_____________________________________________________________________________
	66	static Double_t ptscal(Double_t pt, Int_t np)
	67	{
	68	// SCALING EN MASSE PAR RAPPORT A PTPI
	69	// MASS PI,K,ETA,RHO,OMEGA,ETA',PHI
	70	const Double_t khm[10] = {.13957,.493,.5488,.769,.7826,.958,1.02,0,0,0};
	71	// VALUE MESON/PI AT 5 GEV
	72	const Double_t kfmax[10]={1.,0.3,0.55,1.0,1.0,1.0,1.0,0,0,0};
	73	np--;
	74	Double_t f5=TMath::Power(((
	75	sqrt(100.018215)+2.)/(sqrt(100.+khm[np]*khm[np])+2.0)),12.3);
	76	Double_t fmax2=f5/kfmax[np];
	77	// PIONS
	78	Double_t ptpion=100.ptpi(&pt, (Double_t) 0);
	79	Double_t fmtscal=TMath::Power(((
	80	sqrt(ptpt+0.018215)+2.)/ (sqrt(ptpt+khm[np]*khm[np])+2.0)),12.3)/
	81	fmax2;
	82	return fmtscal*ptpion;
	83	}
	84
	85	//_____________________________________________________________________________
	86	static Double_t ptka( Double_t px, Double_t )
	87	{
	88	//
	89	// pt parametrisation for k
	90	//
	91	return ptscal(*px,2);
	92	}
	93
	94
	95	//_____________________________________________________________________________
	96	static Double_t etapic( Double_t py, Double_t )
	97	{
98	//
99	// eta parametrisation for pi
100	//
101	const Double_t ka1 = 4913.;
102	const Double_t ka2 = 1819.;
103	const Double_t keta1 = 0.22;
104	const Double_t keta2 = 3.66;
105	const Double_t kdeta1 = 1.47;
106	const Double_t kdeta2 = 1.51;
107	Double_t y=TMath::Abs(*py);
108	//
109	Double_t ex1 = (y-keta1)(y-keta1)/(2kdeta1*kdeta1);
110	Double_t ex2 = (y-keta2)(y-keta2)/(2kdeta2*kdeta2);
111	return ka1TMath::Exp(-ex1)+ka2TMath::Exp(-ex2);
112	}
113
114	//_____________________________________________________________________________
115	static Double_t etakac( Double_t py, Double_t )
116	{
117	//
118	// eta parametrisation for ka
119	//
120	const Double_t ka1 = 497.6;
121	const Double_t ka2 = 215.6;
122	const Double_t keta1 = 0.79;
123	const Double_t keta2 = 4.09;
124	const Double_t kdeta1 = 1.54;
125	const Double_t kdeta2 = 1.40;
126	Double_t y=TMath::Abs(*py);
127	//
128	Double_t ex1 = (y-keta1)(y-keta1)/(2kdeta1*kdeta1);
129	Double_t ex2 = (y-keta2)(y-keta2)/(2kdeta2*kdeta2);
130	return ka1TMath::Exp(-ex1)+ka2TMath::Exp(-ex2);
131	}
132
133	static Double_t ptbaryon( Double_t px, Double_t )
134	{
135	// baryons
136	// pt-distribution
137	//____________________________________________________________
138
139	return ptscal(*px,7); // 7==> Baryon in the PtScal function
140	}
141
142	static Double_t etabaryon( Double_t py, Double_t )
143	{
144	// eta-distribution
145	//____________________________________________________________
0af12c00	146	const Float_t kp0 = 1.10343e+02;
	147	const Float_t kp1 = 1.73247e+01;
	148	const Float_t kp2 = -7.23808e+00;
	149	const Float_t kp3 = 4.48334e-01;
	150	const Double_t ky = TMath::Abs(*py);
388f2c07	151	//
0af12c00	152	return (kp0+kp1ky+kp2kyky+kp3kykyky)/20.;
388f2c07	153	}
	154
	155	AliGenHIJINGparaBa::AliGenHIJINGparaBa()
1c56e311	156	:AliGenHIJINGpara(),
	157	fPtba(0),
	158	fETAba(0)
388f2c07	159	{
	160	//
	161	// Default constructor
	162	//
	163	fName="HIGINGparaBa";
	164	fTitle="HIJING Parametrisation Particle Generator with Baryons";
388f2c07	165	}
	166
	167	//_____________________________________________________________________________
	168	AliGenHIJINGparaBa::AliGenHIJINGparaBa(Int_t npart)
1c56e311	169	:AliGenHIJINGpara(npart),
	170	fPtba(0),
	171	fETAba(0)
388f2c07	172	{
	173	//
	174	// Standard constructor
	175	//
	176	fName="HIGINGparaBa";
	177	fTitle="HIJING Parametrisation Particle Generator with Baryons";
388f2c07	178	}
388f2c07	179
1c56e311	180	AliGenHIJINGparaBa::AliGenHIJINGparaBa(const AliGenHIJINGparaBa& para) :
	181	AliGenHIJINGpara(para),
	182	fPtba(0),
	183	fETAba(0)
0af12c00	184	{
	185	// Copy constructor
	186	para.Copy(*this);
	187	}
	188
388f2c07	189	//_____________________________________________________________________________
	190	AliGenHIJINGparaBa::~AliGenHIJINGparaBa()
	191	{
	192	//
	193	// Standard destructor
	194	//
	195	delete fPtba;
	196	delete fETAba;
	197	}
	198
	199	//_____________________________________________________________________________
	200	void AliGenHIJINGparaBa::Init()
	201	{
	202	//
	203	// Initialise the HIJING parametrisation
	204	//
	205	Float_t etaMin =-TMath::Log(TMath::Tan(
	206	TMath::Min((Double_t)fThetaMax/2,TMath::Pi()/2-1.e-10)));
	207	Float_t etaMax = -TMath::Log(TMath::Tan(
	208	TMath::Max((Double_t)fThetaMin/2,1.e-10)));
	209	fPtpi = new TF1("ptpi",&ptpi,0,20,0);
	210	fPtka = new TF1("ptka",&ptka,0,20,0);
	211	fPtba = new TF1("ptbaryon",&ptbaryon,0,20,0);
	212	fETApic = new TF1("etapic",&etapic,etaMin,etaMax,0);
	213	fETAkac = new TF1("etakac",&etakac,etaMin,etaMax,0);
	214	fETAba = new TF1("etabaryon",&etabaryon,etaMin,etaMax,0);
	215
2a336e15	216	TF1 etaPic0("etapic(-7,7)",&etapic, -7, 7, 0);
	217	TF1 etaKac0("etakac(-7,7)",&etakac, -7, 7, 0);
	218	TF1 etaBar0("etabar(-7,7)",&etabaryon, -7, 7, 0);
388f2c07	219
2a336e15	220	TF1 ptPic0("ptpi(0,15)", &ptpi, 0., 15., 0);
	221	TF1 ptKac0("ptka(0,15)", &ptka, 0., 15., 0);
	222	TF1 ptBar0("ptbar(0,15)", &ptbaryon, 0., 15., 0);
388f2c07	223
2a336e15	224	Float_t intETApi = etaPic0.Integral(-0.5, 0.5);
	225	Float_t intETAka = etaKac0.Integral(-0.5, 0.5);
	226	Float_t intETAba = etaBar0.Integral(-0.5, 0.5);
388f2c07	227
	228	Float_t scalePi = 6979./(intETApi/1.5);
	229	Float_t scaleKa = 657./(intETAka/2.0);
	230	Float_t scaleBa = 364./(intETAba/2.0);
	231
	232	// Fraction of events corresponding to the selected pt-range
2a336e15	233	Float_t intPt = (0.837*ptPic0.Integral(0, 15)+
	234	0.105*ptKac0.Integral(0, 15)+
	235	0.058*ptBar0.Integral(0, 15));
	236	Float_t intPtSel = (0.837*ptPic0.Integral(fPtMin, fPtMax)+
	237	0.105*ptKac0.Integral(fPtMin, fPtMax)+
	238	0.058*ptBar0.Integral(fPtMin, fPtMax));
388f2c07	239	Float_t ptFrac = intPtSel/intPt;
	240
	241	// Fraction of events corresponding to the selected eta-range
2a336e15	242	Float_t intETASel = (scalePi*etaPic0.Integral(etaMin, etaMax)+
	243	scaleKa*etaKac0.Integral(etaMin, etaMax)+
	244	scaleBa*etaBar0.Integral(etaMin, etaMax));
388f2c07	245	// Fraction of events corresponding to the selected phi-range
	246	Float_t phiFrac = (fPhiMax-fPhiMin)/2/TMath::Pi();
	247
	248	fParentWeight = Float_t(fNpart)/(intETASelptFracphiFrac);
	249
	250	printf("%s: The number of particles in the selected kinematic region corresponds to %f percent of a full event \n",
	251	ClassName(),100.*fParentWeight);
	252
	253	// Issue warning message if etaMin or etaMax are outside the alowed range
	254	// of the parametrization
	255	if (etaMin < -8.001 \|\| etaMax > 8.001) {
	256	printf("\n \n WARNING FROM AliGenHIJINGParaBa !");
	257	printf("\n YOU ARE USING THE PARAMETERISATION OUTSIDE ");
	258	printf("\n THE ALLOWED PSEUDORAPIDITY RANGE (-8. - 8.)");
	259	printf("\n YOUR LIMITS: %f %f \n \n ", etaMin, etaMax);
	260	}
	261	}
	262
	263	//_____________________________________________________________________________
	264	void AliGenHIJINGparaBa::Generate()
	265	{
	266	//
	267	// Generate one trigger
	268	//
	269
	270
	271	const Float_t kBorne1 = 0.837;
	272	const Float_t kBorne2 = kBorne1+0.105;
	273
	274	Float_t polar[3]= {0,0,0};
	275	//
	276	const Int_t kPions[3] = {kPi0, kPiPlus, kPiMinus};
	277	const Int_t kKaons[4] = {kK0Long, kK0Short, kKPlus, kKMinus};
	278	const Int_t kBaryons[4] = {kProton, kProtonBar, kNeutron, kNeutronBar};
	279	//
	280	Float_t origin[3];
	281	Float_t pt, pl, ptot;
	282	Float_t phi, theta;
	283	Float_t p[3];
	284	Int_t i, part, nt, j;
	285	//
	286	TF1 *ptf;
	287	TF1 *etaf;
	288	//
	289	Float_t random[6];
	290	//
	291	for (j=0;j<3;j++) origin[j]=fOrigin[j];
	292
	293	if(fVertexSmear == kPerEvent) {
	294	Float_t dv[3];
	295	dv[2] = 1.e10;
	296	while(TMath::Abs(dv[2]) > fCutVertexZ*fOsigma[2]) {
	297	Rndm(random,6);
	298	for (j=0; j < 3; j++) {
	299	dv[j] = fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
	300	TMath::Sqrt(-2TMath::Log(random[2j+1]));
	301	}
	302	}
	303	for (j=0; j < 3; j++) origin[j] += dv[j];
	304	} // if kPerEvent
	305	TArrayF eventVertex;
	306	eventVertex.Set(3);
	307	eventVertex[0] = origin[0];
	308	eventVertex[1] = origin[1];
309	eventVertex[2] = origin[2];
310
311	for(i=0;i<fNpart;i++) {
312	while(1) {
313	Rndm(random,3);
314	if(random[0] < kBorne1) {
315	part = kPions[Int_t (random[1]*3)];
316	ptf = fPtpi;
317	etaf = fETApic;
318	} else if (random[0] < kBorne2) {
319	part = kKaons[Int_t (random[1]*4)];
320	ptf = fPtka;
321	etaf = fETAkac;
322	} else {
323	part = kBaryons[Int_t (random[1]*4)];
324	ptf = fPtba;
325	etaf = fETAba;
326	}
327
328	phi=fPhiMin+random[2]*(fPhiMax-fPhiMin);
329	theta=2*TMath::ATan(TMath::Exp(-etaf->GetRandom()));
330	if(theta<fThetaMin \|\| theta>fThetaMax) continue;
331	pt=ptf->GetRandom();
332	pl=pt/TMath::Tan(theta);
333	ptot=TMath::Sqrt(ptpt+plpl);
334	if(ptot<fPMin \|\| ptot>fPMax) continue;
335	p[0]=pt*TMath::Cos(phi);
336	p[1]=pt*TMath::Sin(phi);
337	p[2]=pl;
338	if(fVertexSmear==kPerTrack) {
339	Rndm(random,6);
340	for (j=0;j<3;j++) {
341	origin[j]=fOrigin[j]+fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
342	TMath::Sqrt(-2TMath::Log(random[2j+1]));
343	}
344	}
642f15cf	345	PushTrack(fTrackIt,-1,part,p,origin,polar,0,kPPrimary,nt,fParentWeight);
388f2c07	346	break;
	347	} // while(1)
	348	} // Particle loop
	349	// Header
	350	AliGenEventHeader* header = new AliGenEventHeader("HIJINGparam");
	351	// Event Vertex
	352	header->SetPrimaryVertex(eventVertex);
	353	gAlice->SetGenEventHeader(header);
	354	}
	355
	356
	357