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

/*
$Log$
*/
///////////////////////////////////////////////////////////////////
// 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 "AliGenHIJINGparaBa.h"
#include "AliGenEventHeader.h"
#include "AliRun.h"
#include "AliConst.h"
#include "AliPDG.h"

#include <TF1.h>
#include <TArrayF.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 p0 =  1.10343e+02;
    const Float_t p1 =  1.73247e+01;
    const Float_t p2 = -7.23808e+00;
    const Float_t p3 =  4.48334e-01;
    const Double_t y = TMath::Abs(*py);
//
    return (p0+p1*y+p2*y*y+p3*y*y*y)/20.;
}

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

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

//_____________________________________________________________________________
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 = new TF1("etapic",&etapic,    -7, 7, 0);
    TF1 *etaKac0 = new TF1("etakac",&etakac,    -7, 7, 0);
    TF1 *etaBar0 = new TF1("etabar",&etabaryon, -7, 7, 0);
    
    TF1 *ptPic0  = new TF1("ptpi",  &ptpi,     0., 15., 0);
    TF1 *ptKac0  = new TF1("ptka",  &ptka,     0., 15., 0);
    TF1 *ptBar0  = new TF1("ptbar", &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]));
		}
	    }
	    SetTrack(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
	16	/*
	17	$Log$
	18	*/
	19	///////////////////////////////////////////////////////////////////
	20	// Parameterisation of pi, K, n and p eta and pt distributions //
	21	// eta: according to HIJING (shadowing + quenching) //
	22	// pT : according to CDF measurement at 1.8 TeV //
	23	// Author: andreas.morsch@cern.ch //
	24	// //
	25	///////////////////////////////////////////////////////////////////
	26
	27	#include "AliGenHIJINGparaBa.h"
	28	#include "AliGenEventHeader.h"
	29	#include "AliRun.h"
	30	#include "AliConst.h"
	31	#include "AliPDG.h"
	32
	33	#include <TF1.h>
	34	#include <TArrayF.h>
	35
	36	ClassImp(AliGenHIJINGparaBa)
	37
	38
	39	static Double_t ptpi(Double_t px, Double_t )
	40	{
	41	//
	42	// PT-PARAMETERIZATION CDF, PRL 61(88) 1819
	43	// POWER LAW FOR PT > 500 MEV
	44	// MT SCALING BELOW (T=160 MEV)
	45	//
	46	const Double_t kp0 = 1.3;
	47	const Double_t kxn = 8.28;
	48	const Double_t kxlim=0.5;
	49	const Double_t kt=0.160;
	50	const Double_t kxmpi=0.139;
	51	const Double_t kb=1.;
	52	Double_t y, y1, xmpi2, ynorm, a;
	53	Double_t x=*px;
	54	//
	55	y1=TMath::Power(kp0/(kp0+kxlim),kxn);
	56	xmpi2=kxmpi*kxmpi;
	57	ynorm=kb(TMath::Exp(-sqrt(kxlimkxlim+xmpi2)/kt));
	58	a=ynorm/y1;
	59	if (x > kxlim)
	60	y=a*TMath::Power(kp0/(kp0+x),kxn);
	61	else
	62	y=kbTMath::Exp(-sqrt(xx+xmpi2)/kt);
	63	return y*x;
	64	}
65
66	//_____________________________________________________________________________
67	static Double_t ptscal(Double_t pt, Int_t np)
68	{
69	// SCALING EN MASSE PAR RAPPORT A PTPI
70	// MASS PI,K,ETA,RHO,OMEGA,ETA',PHI
71	const Double_t khm[10] = {.13957,.493,.5488,.769,.7826,.958,1.02,0,0,0};
72	// VALUE MESON/PI AT 5 GEV
73	const Double_t kfmax[10]={1.,0.3,0.55,1.0,1.0,1.0,1.0,0,0,0};
74	np--;
75	Double_t f5=TMath::Power(((
76	sqrt(100.018215)+2.)/(sqrt(100.+khm[np]*khm[np])+2.0)),12.3);
77	Double_t fmax2=f5/kfmax[np];
78	// PIONS
79	Double_t ptpion=100.ptpi(&pt, (Double_t) 0);
80	Double_t fmtscal=TMath::Power(((
81	sqrt(ptpt+0.018215)+2.)/ (sqrt(ptpt+khm[np]*khm[np])+2.0)),12.3)/
82	fmax2;
83	return fmtscal*ptpion;
84	}
85
86	//_____________________________________________________________________________
87	static Double_t ptka( Double_t px, Double_t )
88	{
89	//
90	// pt parametrisation for k
91	//
92	return ptscal(*px,2);
93	}
94
95
96	//_____________________________________________________________________________
97	static Double_t etapic( Double_t py, Double_t )
98	{
99	//
100	// eta parametrisation for pi
101	//
102	const Double_t ka1 = 4913.;
103	const Double_t ka2 = 1819.;
104	const Double_t keta1 = 0.22;
105	const Double_t keta2 = 3.66;
106	const Double_t kdeta1 = 1.47;
107	const Double_t kdeta2 = 1.51;
108	Double_t y=TMath::Abs(*py);
109	//
110	Double_t ex1 = (y-keta1)(y-keta1)/(2kdeta1*kdeta1);
111	Double_t ex2 = (y-keta2)(y-keta2)/(2kdeta2*kdeta2);
112	return ka1TMath::Exp(-ex1)+ka2TMath::Exp(-ex2);
113	}
114
115	//_____________________________________________________________________________
116	static Double_t etakac( Double_t py, Double_t )
117	{
118	//
119	// eta parametrisation for ka
120	//
121	const Double_t ka1 = 497.6;
122	const Double_t ka2 = 215.6;
123	const Double_t keta1 = 0.79;
124	const Double_t keta2 = 4.09;
125	const Double_t kdeta1 = 1.54;
126	const Double_t kdeta2 = 1.40;
127	Double_t y=TMath::Abs(*py);
128	//
129	Double_t ex1 = (y-keta1)(y-keta1)/(2kdeta1*kdeta1);
130	Double_t ex2 = (y-keta2)(y-keta2)/(2kdeta2*kdeta2);
131	return ka1TMath::Exp(-ex1)+ka2TMath::Exp(-ex2);
132	}
133
134	static Double_t ptbaryon( Double_t px, Double_t )
135	{
136	// baryons
137	// pt-distribution
138	//____________________________________________________________
139
140	return ptscal(*px,7); // 7==> Baryon in the PtScal function
141	}
142
143	static Double_t etabaryon( Double_t py, Double_t )
144	{
145	// eta-distribution
146	//____________________________________________________________
147	const Float_t p0 = 1.10343e+02;
148	const Float_t p1 = 1.73247e+01;
149	const Float_t p2 = -7.23808e+00;
150	const Float_t p3 = 4.48334e-01;
151	const Double_t y = TMath::Abs(*py);
152	//
153	return (p0+p1y+p2yy+p3yyy)/20.;
154	}
155
156	AliGenHIJINGparaBa::AliGenHIJINGparaBa()
157	:AliGenHIJINGpara()
158	{
159	//
160	// Default constructor
161	//
162	fName="HIGINGparaBa";
163	fTitle="HIJING Parametrisation Particle Generator with Baryons";
164	fETAba = 0;
165	fPtba = 0;
166	}
167
168	//_____________________________________________________________________________
169	AliGenHIJINGparaBa::AliGenHIJINGparaBa(Int_t npart)
170	:AliGenHIJINGpara(npart)
171	{
172	//
173	// Standard constructor
174	//
175	fName="HIGINGparaBa";
176	fTitle="HIJING Parametrisation Particle Generator with Baryons";
177	fETAba = 0;
178	fPtba = 0;
179	}
180
181	//_____________________________________________________________________________
182	AliGenHIJINGparaBa::~AliGenHIJINGparaBa()
183	{
184	//
185	// Standard destructor
186	//
187	delete fPtba;
188	delete fETAba;
189	}
190
191	//_____________________________________________________________________________
192	void AliGenHIJINGparaBa::Init()
193	{
194	//
195	// Initialise the HIJING parametrisation
196	//
197	Float_t etaMin =-TMath::Log(TMath::Tan(
198	TMath::Min((Double_t)fThetaMax/2,TMath::Pi()/2-1.e-10)));
199	Float_t etaMax = -TMath::Log(TMath::Tan(
200	TMath::Max((Double_t)fThetaMin/2,1.e-10)));
201	fPtpi = new TF1("ptpi",&ptpi,0,20,0);
202	fPtka = new TF1("ptka",&ptka,0,20,0);
203	fPtba = new TF1("ptbaryon",&ptbaryon,0,20,0);
204	fETApic = new TF1("etapic",&etapic,etaMin,etaMax,0);
205	fETAkac = new TF1("etakac",&etakac,etaMin,etaMax,0);
206	fETAba = new TF1("etabaryon",&etabaryon,etaMin,etaMax,0);
207
208	TF1 *etaPic0 = new TF1("etapic",&etapic, -7, 7, 0);
209	TF1 *etaKac0 = new TF1("etakac",&etakac, -7, 7, 0);
210	TF1 *etaBar0 = new TF1("etabar",&etabaryon, -7, 7, 0);
211
212	TF1 *ptPic0 = new TF1("ptpi", &ptpi, 0., 15., 0);
213	TF1 *ptKac0 = new TF1("ptka", &ptka, 0., 15., 0);
214	TF1 *ptBar0 = new TF1("ptbar", &ptbaryon, 0., 15., 0);
215
216	Float_t intETApi = etaPic0->Integral(-0.5, 0.5);
217	Float_t intETAka = etaKac0->Integral(-0.5, 0.5);
218	Float_t intETAba = etaBar0->Integral(-0.5, 0.5);
219
220	Float_t scalePi = 6979./(intETApi/1.5);
221	Float_t scaleKa = 657./(intETAka/2.0);
222	Float_t scaleBa = 364./(intETAba/2.0);
223
224	// Fraction of events corresponding to the selected pt-range
225	Float_t intPt = (0.837*ptPic0->Integral(0, 15)+
226	0.105*ptKac0->Integral(0, 15)+
227	0.058*ptBar0->Integral(0, 15));
228	Float_t intPtSel = (0.837*ptPic0->Integral(fPtMin, fPtMax)+
229	0.105*ptKac0->Integral(fPtMin, fPtMax)+
230	0.058*ptBar0->Integral(fPtMin, fPtMax));
231	Float_t ptFrac = intPtSel/intPt;
232
233	// Fraction of events corresponding to the selected eta-range
234	Float_t intETASel = (scalePi*etaPic0->Integral(etaMin, etaMax)+
235	scaleKa*etaKac0->Integral(etaMin, etaMax)+
236	scaleBa*etaBar0->Integral(etaMin, etaMax));
237	// Fraction of events corresponding to the selected phi-range
238	Float_t phiFrac = (fPhiMax-fPhiMin)/2/TMath::Pi();
239
240	fParentWeight = Float_t(fNpart)/(intETASelptFracphiFrac);
241
242	printf("%s: The number of particles in the selected kinematic region corresponds to %f percent of a full event \n",
243	ClassName(),100.*fParentWeight);
244
245	// Issue warning message if etaMin or etaMax are outside the alowed range
246	// of the parametrization
247	if (etaMin < -8.001 \|\| etaMax > 8.001) {
248	printf("\n \n WARNING FROM AliGenHIJINGParaBa !");
249	printf("\n YOU ARE USING THE PARAMETERISATION OUTSIDE ");
250	printf("\n THE ALLOWED PSEUDORAPIDITY RANGE (-8. - 8.)");
251	printf("\n YOUR LIMITS: %f %f \n \n ", etaMin, etaMax);
252	}
253	}
254
255	//_____________________________________________________________________________
256	void AliGenHIJINGparaBa::Generate()
257	{
258	//
259	// Generate one trigger
260	//
261
262
263	const Float_t kBorne1 = 0.837;
264	const Float_t kBorne2 = kBorne1+0.105;
265
266	Float_t polar[3]= {0,0,0};
267	//
268	const Int_t kPions[3] = {kPi0, kPiPlus, kPiMinus};
269	const Int_t kKaons[4] = {kK0Long, kK0Short, kKPlus, kKMinus};
270	const Int_t kBaryons[4] = {kProton, kProtonBar, kNeutron, kNeutronBar};
271	//
272	Float_t origin[3];
273	Float_t pt, pl, ptot;
274	Float_t phi, theta;
275	Float_t p[3];
276	Int_t i, part, nt, j;
277	//
278	TF1 *ptf;
279	TF1 *etaf;
280	//
281	Float_t random[6];
282	//
283	for (j=0;j<3;j++) origin[j]=fOrigin[j];
284
285	if(fVertexSmear == kPerEvent) {
286	Float_t dv[3];
287	dv[2] = 1.e10;
288	while(TMath::Abs(dv[2]) > fCutVertexZ*fOsigma[2]) {
289	Rndm(random,6);
290	for (j=0; j < 3; j++) {
291	dv[j] = fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
292	TMath::Sqrt(-2TMath::Log(random[2j+1]));
293	}
294	}
295	for (j=0; j < 3; j++) origin[j] += dv[j];
296	} // if kPerEvent
297	TArrayF eventVertex;
298	eventVertex.Set(3);
299	eventVertex[0] = origin[0];
300	eventVertex[1] = origin[1];
301	eventVertex[2] = origin[2];
302
303	for(i=0;i<fNpart;i++) {
304	while(1) {
305	Rndm(random,3);
306	if(random[0] < kBorne1) {
307	part = kPions[Int_t (random[1]*3)];
308	ptf = fPtpi;
309	etaf = fETApic;
310	} else if (random[0] < kBorne2) {
311	part = kKaons[Int_t (random[1]*4)];
312	ptf = fPtka;
313	etaf = fETAkac;
314	} else {
315	part = kBaryons[Int_t (random[1]*4)];
316	ptf = fPtba;
317	etaf = fETAba;
318	}
319
320	phi=fPhiMin+random[2]*(fPhiMax-fPhiMin);
321	theta=2*TMath::ATan(TMath::Exp(-etaf->GetRandom()));
322	if(theta<fThetaMin \|\| theta>fThetaMax) continue;
323	pt=ptf->GetRandom();
324	pl=pt/TMath::Tan(theta);
325	ptot=TMath::Sqrt(ptpt+plpl);
326	if(ptot<fPMin \|\| ptot>fPMax) continue;
327	p[0]=pt*TMath::Cos(phi);
328	p[1]=pt*TMath::Sin(phi);
329	p[2]=pl;
330	if(fVertexSmear==kPerTrack) {
331	Rndm(random,6);
332	for (j=0;j<3;j++) {
333	origin[j]=fOrigin[j]+fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
334	TMath::Sqrt(-2TMath::Log(random[2j+1]));
335	}
336	}
337	SetTrack(fTrackIt,-1,part,p,origin,polar,0,kPPrimary,nt,fParentWeight);
338	break;
339	} // while(1)
340	} // Particle loop
341	// Header
342	AliGenEventHeader* header = new AliGenEventHeader("HIJINGparam");
343	// Event Vertex
344	header->SetPrimaryVertex(eventVertex);
345	gAlice->SetGenEventHeader(header);
346	}
347
348
349