[u/mrichter/AliRoot.git] / THerwig / AliGenHerwig.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.                  *
 **************************************************************************/

/* $Id$ */


// Generator using Herwig as an external generator
// The main Herwig options are accessable for the user through this interface.
// Uses the THerwig implementation of TGenerator.


#include <Riostream.h>
#include <TClonesArray.h>
#include <TParticle.h>

#include <THerwig6.h>

#include "AliGenHerwig.h"
#include "AliGenHerwigEventHeader.h"
#include "AliHerwigRndm.h"
#include "AliMC.h"
#include "AliRun.h"
#include "driver.h"

ClassImp(AliGenHerwig)


  AliGenHerwig::AliGenHerwig() :
    AliGenMC(),
    fAutPDF("LHAPDF"),
    fModPDF(19070),
    fStrucFunc(kCTEQ5L),
    fKeep(0),
    fDecaysOff(1),
    fTrigger(0),
    fSelectAll(0),
    fFlavor(0),
    fMomentum1(7000),
    fMomentum2(7000),
    fKineBias(1),
    fTrials(0),
    fXsection(0),
    fHerwig(0x0),
    fProcess(0),
    fPtHardMin(0.),
    fPtHardMax(9999.),
    fPtRMS(0.),
    fMaxPr(10),
    fMaxErrors(1000),
    fEnSoft(1),
    fEv1Pr(0),
    fEv2Pr(0),
    fFileName(0),
    fEtaMinParton(-20.),     
    fEtaMaxParton(20.),     
    fPhiMinParton(0.),     
    fPhiMaxParton(2.* TMath::Pi()),     
    fEtaMinGamma(-20.),      
    fEtaMaxGamma(20.),      
    fPhiMinGamma(0.),      
    fPhiMaxGamma(2. * TMath::Pi()),
    fHeader(0)
{
// Constructor
  fEnergyCMS = 14000;
}

AliGenHerwig::AliGenHerwig(Int_t npart)
    :AliGenMC(npart),
    fAutPDF("LHAPDF"),
    fModPDF(19070),
    fStrucFunc(kCTEQ5L),
    fKeep(0),
    fDecaysOff(1),
    fTrigger(0),
    fSelectAll(0),
    fFlavor(0),
    fMomentum1(7000),
    fMomentum2(7000),
    fKineBias(1),
    fTrials(0),
    fXsection(0),
    fHerwig(0x0),
    fProcess(0),
    fPtHardMin(0.),
    fPtHardMax(9999.),
    fPtRMS(0.),
    fMaxPr(10),
    fMaxErrors(1000),
    fEnSoft(1),
    fEv1Pr(0),
    fEv2Pr(0),
    fFileName(0),
    fEtaMinParton(-20.),     
    fEtaMaxParton(20.),     
    fPhiMinParton(0.),     
    fPhiMaxParton(2.* TMath::Pi()),     
    fEtaMinGamma(-20.),      
    fEtaMaxGamma(20.),      
    fPhiMinGamma(0.),
    fPhiMaxGamma(2. * TMath::Pi()),
    fHeader(0)
{
    fEnergyCMS = 14000;
    SetTarget();
    SetProjectile();
    // Set random number generator
    AliHerwigRndm::SetHerwigRandom(GetRandom());
}

AliGenHerwig::~AliGenHerwig()
{
// Destructor
}

void AliGenHerwig::SetEventListRange(Int_t eventFirst, Int_t eventLast)
{
  fEv1Pr = eventFirst;
  fEv2Pr = eventLast;
  if ( fEv2Pr == -1 ) fEv2Pr = fEv2Pr;
}

void AliGenHerwig::Init()
{
// Initialisation
  fTarget.Resize(8);
  fProjectile.Resize(8);
  SetMC(new THerwig6());
  fHerwig=(THerwig6*) fMCEvGen;
  // initialize common blocks
  fHerwig->Initialize(fProjectile.Data(), fTarget.Data(), fMomentum1, fMomentum2, fProcess); // 
  // reset parameters according to user needs
  InitPDF();
  fHerwig->SetPTMIN(fPtHardMin);
  fHerwig->SetPTMAX(fPtHardMax);
  fHerwig->SetPTRMS(fPtRMS);
  fHerwig->SetMAXPR(fMaxPr);
  fHerwig->SetMAXER(fMaxErrors);
  fHerwig->SetENSOF(fEnSoft);
// C---D,U,S,C,B,T QUARK AND GLUON MASSES (IN THAT ORDER)
//       RMASS(1)=0.32
//       RMASS(2)=0.32
//       RMASS(3)=0.5
//       RMASS(4)=1.55
//       RMASS(5)=4.75
//       RMASS(6)=174.3
//       RMASS(13)=0.75

  fHerwig->SetRMASS(4,1.2);
  fHerwig->SetRMASS(5,4.75);

  if ( fProcess < 0 ) strncpy(VVJIN.QQIN,fFileName.Data(), 49);

  //fHerwig->Hwusta("PI0     ");

  // compute parameter dependent constants
  fHerwig->PrepareRun();
}

void AliGenHerwig::InitJimmy()
{
// Initialisation
  fTarget.Resize(8);
  fProjectile.Resize(8);
  SetMC(new THerwig6());
  fHerwig=(THerwig6*) fMCEvGen;
  // initialize common blocks
  fHerwig->InitializeJimmy(fProjectile, fTarget, fMomentum1, fMomentum2, fProcess);
  // reset parameters according to user needs
  InitPDF();
  fHerwig->SetPTMIN(fPtHardMin);
  fHerwig->SetPTRMS(fPtRMS);
  fHerwig->SetMAXPR(fMaxPr);
  fHerwig->SetMAXER(fMaxErrors);
  fHerwig->SetENSOF(fEnSoft);

// C---D,U,S,C,B,T QUARK AND GLUON MASSES (IN THAT ORDER)
//       RMASS(1)=0.32
//       RMASS(2)=0.32
//       RMASS(3)=0.5
//       RMASS(4)=1.55
//       RMASS(5)=4.75
//       RMASS(6)=174.3
//       RMASS(13)=0.75

  fHerwig->SetRMASS(4,1.2);
  fHerwig->SetRMASS(5,4.75);

  if ( fProcess < 0 ) strncpy(VVJIN.QQIN,fFileName.Data(), 49);

  //  fHerwig->Hwusta("PI0     ");

  // compute parameter dependent constants
  fHerwig->PrepareRunJimmy();
}

void AliGenHerwig::InitPDF()
{
  switch(fStrucFunc)
    {
// ONLY USES LHAPDF STRUCTURE FUNCTIONS
    case kGRVLO98:
      fModPDF=80060;
      fAutPDF="HWLHAPDF";
      break;
    case kCTEQ6:
      fModPDF=10040;
      fAutPDF="HWLHAPDF";
      break;
    case kCTEQ61:
      fModPDF=10100;
      fAutPDF="HWLHAPDF";
      break;
    case kCTEQ6m:
      fModPDF=10050;
      fAutPDF="HWLHAPDF";
      break;
    case kCTEQ6l:
      fModPDF=10041;
      fAutPDF="HWLHAPDF";
      break;
    case kCTEQ6ll:
      fModPDF=10042;
      fAutPDF="HWLHAPDF";
      break;
    case kCTEQ5M:
      fModPDF=19050;
      fAutPDF="HWLHAPDF";
      break;
    case kCTEQ5L:
      fModPDF=19070;
      fAutPDF="HWLHAPDF";
      break;
    case kCTEQ4M:
      fModPDF=19150;
      fAutPDF="HWLHAPDF";
      break;
    case kCTEQ4L:
      fModPDF=19170;
      fAutPDF="HWLHAPDF";
      break;
//    case kMRST2004nlo:
//      fModPDF=20400;
//      fAutPDF="HWLHAPDF";
//      break;
    default:
      cerr << "This structure function is not inplemented " << fStrucFunc << endl;
      break;
    }
  fAutPDF.Resize(20);
  fHerwig->SetMODPDF(1,fModPDF);
  fHerwig->SetMODPDF(2,fModPDF);
  fHerwig->SetAUTPDF(1,fAutPDF);
  fHerwig->SetAUTPDF(2,fAutPDF);
}

void AliGenHerwig::Generate()
{
  // Generate one event

  Float_t polar[3]  =   {0,0,0};
  Float_t origin[3] =   {0,0,0};
  Float_t p[4];

  static TClonesArray *particles;
  //  converts from mm/c to s
  const Float_t kconv=0.001/2.999792458e8;
  //
  Int_t nt=0;
  Int_t jev=0;
  Int_t kf, ks, imo;
  kf=0;

  if(!particles) particles=new TClonesArray("TParticle",10000);

  fTrials=0;

  //  Set collision vertex position 
  if (fVertexSmear == kPerEvent) Vertex();

  while(1)
    {
	fHerwig->GenerateEvent();
	fTrials++;
	fHerwig->ImportParticles(particles,"All");
	Int_t np = particles->GetEntriesFast()-1;
	if (np == 0 ) continue;

	//Check hard partons or direct gamma in kine range

	if (fProcess == kHeJets || fProcess == kHeDirectGamma) {
	    TParticle* parton1 = (TParticle *) particles->At(6);
	    TParticle* parton2 = (TParticle *) particles->At(7);
	    if (!CheckParton(parton1, parton2))  continue ;
	} 

	// 
	if (gAlice) {
	    if (gAlice->GetEvNumber()>=fEv1Pr &&
		gAlice->GetEvNumber()<=fEv2Pr) fHerwig->PrintEvt();

	}

	
	Int_t nc = 0;
	fNprimaries = 0;
	
	Int_t * newPos = new Int_t[np];
	for (Int_t i = 0; i<np; i++) *(newPos+i)=-1;

	for (Int_t i = 0; i<np; i++) {
	    TParticle *  iparticle       = (TParticle *) particles->At(i);
	    imo = iparticle->GetFirstMother();
	    kf        = iparticle->GetPdgCode();
	    ks        = iparticle->GetStatusCode();
	    if (ks != 3 &&
		KinematicSelection(iparticle,0))
	    {
		nc++;
		p[0]=iparticle->Px();
		p[1]=iparticle->Py();
		p[2]=iparticle->Pz();
		p[3]=iparticle->Energy();

		origin[0] = fVertex[0] + iparticle->Vx()/10; // [cm]
		origin[1] = fVertex[1] + iparticle->Vy()/10; // [cm]
		origin[2] = fVertex[2] + iparticle->Vz()/10; // [cm]

		Float_t tof = kconv*iparticle->T();
		Int_t   iparent = (imo > -1) ? newPos[imo] : -1;
		Int_t   trackIt = (ks == 1) && fTrackIt;
		PushTrack(trackIt, iparent, kf,
			  p[0], p[1], p[2], p[3],
			  origin[0], origin[1], origin[2],
			  tof,
			  polar[0], polar[1], polar[2],
			  kPPrimary, nt, fHerwig->GetEVWGT(), ks);
		KeepTrack(nt);
		newPos[i]=nt;
		fNprimaries++;
	    } // end of if: selection of particle
	} // end of for: particle loop
	if (newPos) delete[] newPos;
	if (nc > 0) {
	    jev+=nc;
	    if (jev >= fNpart || fNpart == -1) {
		fKineBias=Float_t(fNpart)/Float_t(fTrials);
		break;
	    }
	}
    }
//
  MakeHeader();
//  
  SetHighWaterMark(nt);
//  adjust weight due to kinematic selection
  AdjustWeights();
//  get cross-section
  fXsection=fHerwig->GetAVWGT();
  //printf(">> trials << %d\n",fTrials);
}

Bool_t AliGenHerwig::CheckParton(TParticle* parton1, TParticle* parton2)
{
// Check the kinematic trigger condition
//
//Select events with parton max energy
    if(fPtHardMax < parton1->Pt()) return kFALSE;

// Select events within angular window
    Double_t eta[2];
    eta[0] = parton1->Eta();
    eta[1] = parton2->Eta();
    Double_t phi[2];
    phi[0] = parton1->Phi();
    phi[1] = parton2->Phi();
    Int_t    pdg[2]; 
    pdg[0] = parton1->GetPdgCode();
    pdg[1] = parton2->GetPdgCode();   
    printf("min %f, max %f\n",fPtHardMin, fPtHardMax);
    printf("Parton 1: %s, pT= %2.2f, eta = %1.2f, phi = %2.2f\n", parton1->GetName(),parton1->Pt(), eta[0],phi[0]*TMath::RadToDeg());
    printf("Parton 2: %s, pT= %2.2f, eta = %1.2f, phi = %2.2f\n", parton2->GetName(),parton2->Pt(), eta[1],phi[1]*TMath::RadToDeg());
    
    if (fProcess == kHeJets) {
      //Check if one of the 2 outgoing partons are in the eta-phi window
      for(Int_t i = 0; i < 2; i++)
	if ((eta[i] < fEtaMaxParton  && eta[i] > fEtaMinParton) &&
	    (phi[i] < fPhiMaxParton  && phi[i] > fPhiMinParton)) return  kTRUE ;
    }
    
    else {
      //Check if the gamma and the jet  are in the eta-phi window
      Int_t igj = 0;
      Int_t ijj = 0;
      if(pdg[0] == 22) ijj=1;
      else igj=1;
      if ((eta[ijj] < fEtaMaxParton   && eta[ijj] > fEtaMinParton) &&
	  (phi[ijj] < fPhiMaxParton   && phi[ijj] > fPhiMinParton)) {
	
	if ((eta[igj] < fEtaMaxGamma   && eta[igj] > fEtaMinGamma) &&
	    (phi[igj] < fPhiMaxGamma   && phi[igj] > fPhiMinGamma)) return  kTRUE;
	
      }
    }

    return kFALSE ;
}

void AliGenHerwig::AdjustWeights()
{
// Adjust the weights after generation of all events
    TParticle *part;
    Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
    for (Int_t i=0; i<ntrack; i++) {
        part= gAlice->GetMCApp()->Particle(i);
        part->SetWeight(part->GetWeight()*fKineBias);
    }
}


void AliGenHerwig::KeepFullEvent()
{
    fKeep=1;
}

Bool_t AliGenHerwig::DaughtersSelection(TParticle* iparticle, TClonesArray* particles)
{
//
// Looks recursively if one of the daughters has been selected
//
//    printf("\n Consider daughters %d:",iparticle->GetPdgCode());
    Int_t imin=-1;
    Int_t imax=-1;
    Int_t i;
    Bool_t hasDaughters= (iparticle->GetFirstDaughter() >=0);
    Bool_t selected=kFALSE;
    if (hasDaughters) {
	imin=iparticle->GetFirstDaughter();
	imax=iparticle->GetLastDaughter();
	for (i=imin; i<= imax; i++){
	    TParticle *  jparticle       = (TParticle *) particles->At(i);
	    Int_t ip=jparticle->GetPdgCode();
	    if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
		selected=kTRUE; break;
	    }
	    if (DaughtersSelection(jparticle, particles)) {selected=kTRUE; break; }
	}
    } else {
	return kFALSE;
    }

    return selected;
}


Bool_t AliGenHerwig::SelectFlavor(Int_t pid)
{
// Select flavor of particle
// 0: all
// 4: charm and beauty
// 5: beauty
    if (fFlavor == 0) return kTRUE;

    Int_t ifl=TMath::Abs(pid/100);
    if (ifl > 10) ifl/=10;
    return (fFlavor == ifl);
}

Bool_t AliGenHerwig::Stable(TParticle*  particle)
{
// Return true for a stable particle
//
    Int_t kf = TMath::Abs(particle->GetPdgCode());

    if ( (particle->GetFirstDaughter() < 0 ) || (kf == 1000*fFlavor+122))

    {
	return kTRUE;
    } else {
	return kFALSE;
    }
}

void AliGenHerwig::FinishRun()
{
  fHerwig->Hwefin();
}

void AliGenHerwig::FinishRunJimmy()
{
  fHerwig->Hwefin();
  fHerwig->Jmefin();

}


void AliGenHerwig::MakeHeader()
{
//
// Make header for the simulated event
// 
  if (fHeader) delete fHeader;
  fHeader = new AliGenHerwigEventHeader("Herwig");
//
// Event type  
    ((AliGenHerwigEventHeader*) fHeader)->SetProcessType(fHerwig->GetIHPRO());
//
// Number of trials
    ((AliGenHerwigEventHeader*) fHeader)->SetTrials(fTrials);
//
// Event Vertex 
    fHeader->SetPrimaryVertex(fVertex);
    
//
// Number of primaries
    fHeader->SetNProduced(fNprimaries);
//  Pass header
//
    AddHeader(fHeader);
    fHeader = 0x0;  
}
Commit	Line	Data
	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	/* $Id$ */
	17
	18
	19	// Generator using Herwig as an external generator
	20	// The main Herwig options are accessable for the user through this interface.
	21	// Uses the THerwig implementation of TGenerator.
	22
	23
	24	#include <Riostream.h>
	25	#include <TClonesArray.h>
	26	#include <TParticle.h>
	27
	28	#include <THerwig6.h>
	29
	30	#include "AliGenHerwig.h"
	31	#include "AliGenHerwigEventHeader.h"
	32	#include "AliHerwigRndm.h"
	33	#include "AliMC.h"
	34	#include "AliRun.h"
	35	#include "driver.h"
	36
	37	ClassImp(AliGenHerwig)
	38
	39
	40	AliGenHerwig::AliGenHerwig() :
	41	AliGenMC(),
	42	fAutPDF("LHAPDF"),
	43	fModPDF(19070),
	44	fStrucFunc(kCTEQ5L),
	45	fKeep(0),
	46	fDecaysOff(1),
	47	fTrigger(0),
	48	fSelectAll(0),
	49	fFlavor(0),
	50	fMomentum1(7000),
	51	fMomentum2(7000),
	52	fKineBias(1),
	53	fTrials(0),
	54	fXsection(0),
	55	fHerwig(0x0),
	56	fProcess(0),
	57	fPtHardMin(0.),
	58	fPtHardMax(9999.),
	59	fPtRMS(0.),
	60	fMaxPr(10),
	61	fMaxErrors(1000),
	62	fEnSoft(1),
	63	fEv1Pr(0),
	64	fEv2Pr(0),
	65	fFileName(0),
	66	fEtaMinParton(-20.),
	67	fEtaMaxParton(20.),
	68	fPhiMinParton(0.),
	69	fPhiMaxParton(2.* TMath::Pi()),
	70	fEtaMinGamma(-20.),
	71	fEtaMaxGamma(20.),
	72	fPhiMinGamma(0.),
	73	fPhiMaxGamma(2. * TMath::Pi()),
	74	fHeader(0)
	75	{
	76	// Constructor
	77	fEnergyCMS = 14000;
	78	}
	79
	80	AliGenHerwig::AliGenHerwig(Int_t npart)
	81	:AliGenMC(npart),
	82	fAutPDF("LHAPDF"),
	83	fModPDF(19070),
	84	fStrucFunc(kCTEQ5L),
	85	fKeep(0),
	86	fDecaysOff(1),
	87	fTrigger(0),
	88	fSelectAll(0),
	89	fFlavor(0),
	90	fMomentum1(7000),
	91	fMomentum2(7000),
	92	fKineBias(1),
	93	fTrials(0),
	94	fXsection(0),
	95	fHerwig(0x0),
	96	fProcess(0),
	97	fPtHardMin(0.),
	98	fPtHardMax(9999.),
	99	fPtRMS(0.),
	100	fMaxPr(10),
	101	fMaxErrors(1000),
	102	fEnSoft(1),
	103	fEv1Pr(0),
	104	fEv2Pr(0),
	105	fFileName(0),
	106	fEtaMinParton(-20.),
	107	fEtaMaxParton(20.),
	108	fPhiMinParton(0.),
	109	fPhiMaxParton(2.* TMath::Pi()),
	110	fEtaMinGamma(-20.),
	111	fEtaMaxGamma(20.),
	112	fPhiMinGamma(0.),
	113	fPhiMaxGamma(2. * TMath::Pi()),
	114	fHeader(0)
	115	{
	116	fEnergyCMS = 14000;
	117	SetTarget();
	118	SetProjectile();
	119	// Set random number generator
	120	AliHerwigRndm::SetHerwigRandom(GetRandom());
	121	}
	122
	123	AliGenHerwig::~AliGenHerwig()
	124	{
	125	// Destructor
	126	}
	127
	128	void AliGenHerwig::SetEventListRange(Int_t eventFirst, Int_t eventLast)
	129	{
	130	fEv1Pr = eventFirst;
	131	fEv2Pr = eventLast;
	132	if ( fEv2Pr == -1 ) fEv2Pr = fEv2Pr;
	133	}
	134
	135	void AliGenHerwig::Init()
	136	{
	137	// Initialisation
	138	fTarget.Resize(8);
	139	fProjectile.Resize(8);
	140	SetMC(new THerwig6());
	141	fHerwig=(THerwig6*) fMCEvGen;
	142	// initialize common blocks
	143	fHerwig->Initialize(fProjectile.Data(), fTarget.Data(), fMomentum1, fMomentum2, fProcess); //
	144	// reset parameters according to user needs
	145	InitPDF();
	146	fHerwig->SetPTMIN(fPtHardMin);
	147	fHerwig->SetPTMAX(fPtHardMax);
	148	fHerwig->SetPTRMS(fPtRMS);
	149	fHerwig->SetMAXPR(fMaxPr);
	150	fHerwig->SetMAXER(fMaxErrors);
	151	fHerwig->SetENSOF(fEnSoft);
	152	// C---D,U,S,C,B,T QUARK AND GLUON MASSES (IN THAT ORDER)
	153	// RMASS(1)=0.32
	154	// RMASS(2)=0.32
	155	// RMASS(3)=0.5
	156	// RMASS(4)=1.55
	157	// RMASS(5)=4.75
	158	// RMASS(6)=174.3
	159	// RMASS(13)=0.75
	160
	161	fHerwig->SetRMASS(4,1.2);
	162	fHerwig->SetRMASS(5,4.75);
	163
	164	if ( fProcess < 0 ) strncpy(VVJIN.QQIN,fFileName.Data(), 49);
	165
	166	//fHerwig->Hwusta("PI0 ");
	167
	168	// compute parameter dependent constants
	169	fHerwig->PrepareRun();
	170	}
	171
	172	void AliGenHerwig::InitJimmy()
	173	{
	174	// Initialisation
	175	fTarget.Resize(8);
	176	fProjectile.Resize(8);
	177	SetMC(new THerwig6());
	178	fHerwig=(THerwig6*) fMCEvGen;
	179	// initialize common blocks
	180	fHerwig->InitializeJimmy(fProjectile, fTarget, fMomentum1, fMomentum2, fProcess);
	181	// reset parameters according to user needs
	182	InitPDF();
	183	fHerwig->SetPTMIN(fPtHardMin);
	184	fHerwig->SetPTRMS(fPtRMS);
	185	fHerwig->SetMAXPR(fMaxPr);
	186	fHerwig->SetMAXER(fMaxErrors);
	187	fHerwig->SetENSOF(fEnSoft);
	188
	189	// C---D,U,S,C,B,T QUARK AND GLUON MASSES (IN THAT ORDER)
	190	// RMASS(1)=0.32
	191	// RMASS(2)=0.32
	192	// RMASS(3)=0.5
	193	// RMASS(4)=1.55
	194	// RMASS(5)=4.75
	195	// RMASS(6)=174.3
	196	// RMASS(13)=0.75
	197
	198	fHerwig->SetRMASS(4,1.2);
	199	fHerwig->SetRMASS(5,4.75);
	200
	201	if ( fProcess < 0 ) strncpy(VVJIN.QQIN,fFileName.Data(), 49);
	202
	203	// fHerwig->Hwusta("PI0 ");
	204
	205	// compute parameter dependent constants
	206	fHerwig->PrepareRunJimmy();
	207	}
	208
	209	void AliGenHerwig::InitPDF()
	210	{
	211	switch(fStrucFunc)
	212	{
	213	// ONLY USES LHAPDF STRUCTURE FUNCTIONS
	214	case kGRVLO98:
	215	fModPDF=80060;
	216	fAutPDF="HWLHAPDF";
	217	break;
	218	case kCTEQ6:
	219	fModPDF=10040;
	220	fAutPDF="HWLHAPDF";
	221	break;
	222	case kCTEQ61:
	223	fModPDF=10100;
	224	fAutPDF="HWLHAPDF";
	225	break;
	226	case kCTEQ6m:
	227	fModPDF=10050;
	228	fAutPDF="HWLHAPDF";
	229	break;
	230	case kCTEQ6l:
	231	fModPDF=10041;
	232	fAutPDF="HWLHAPDF";
	233	break;
	234	case kCTEQ6ll:
	235	fModPDF=10042;
	236	fAutPDF="HWLHAPDF";
	237	break;
	238	case kCTEQ5M:
	239	fModPDF=19050;
	240	fAutPDF="HWLHAPDF";
	241	break;
	242	case kCTEQ5L:
	243	fModPDF=19070;
	244	fAutPDF="HWLHAPDF";
	245	break;
	246	case kCTEQ4M:
	247	fModPDF=19150;
	248	fAutPDF="HWLHAPDF";
	249	break;
	250	case kCTEQ4L:
	251	fModPDF=19170;
	252	fAutPDF="HWLHAPDF";
	253	break;
	254	// case kMRST2004nlo:
	255	// fModPDF=20400;
	256	// fAutPDF="HWLHAPDF";
	257	// break;
	258	default:
	259	cerr << "This structure function is not inplemented " << fStrucFunc << endl;
	260	break;
	261	}
	262	fAutPDF.Resize(20);
	263	fHerwig->SetMODPDF(1,fModPDF);
	264	fHerwig->SetMODPDF(2,fModPDF);
	265	fHerwig->SetAUTPDF(1,fAutPDF);
	266	fHerwig->SetAUTPDF(2,fAutPDF);
	267	}
	268
	269	void AliGenHerwig::Generate()
	270	{
	271	// Generate one event
	272
	273	Float_t polar[3] = {0,0,0};
	274	Float_t origin[3] = {0,0,0};
	275	Float_t p[4];
	276
	277	static TClonesArray *particles;
	278	// converts from mm/c to s
	279	const Float_t kconv=0.001/2.999792458e8;
	280	//
	281	Int_t nt=0;
	282	Int_t jev=0;
	283	Int_t kf, ks, imo;
	284	kf=0;
	285
	286	if(!particles) particles=new TClonesArray("TParticle",10000);
	287
	288	fTrials=0;
	289
	290	// Set collision vertex position
	291	if (fVertexSmear == kPerEvent) Vertex();
	292
	293	while(1)
	294	{
	295	fHerwig->GenerateEvent();
	296	fTrials++;
	297	fHerwig->ImportParticles(particles,"All");
	298	Int_t np = particles->GetEntriesFast()-1;
	299	if (np == 0 ) continue;
	300
	301	//Check hard partons or direct gamma in kine range
	302
	303	if (fProcess == kHeJets \|\| fProcess == kHeDirectGamma) {
	304	TParticle* parton1 = (TParticle *) particles->At(6);
	305	TParticle* parton2 = (TParticle *) particles->At(7);
	306	if (!CheckParton(parton1, parton2)) continue ;
	307	}
	308
	309	//
	310	if (gAlice) {
	311	if (gAlice->GetEvNumber()>=fEv1Pr &&
	312	gAlice->GetEvNumber()<=fEv2Pr) fHerwig->PrintEvt();
	313
	314	}
	315
	316
	317	Int_t nc = 0;
	318	fNprimaries = 0;
	319
	320	Int_t * newPos = new Int_t[np];
	321	for (Int_t i = 0; i<np; i++) *(newPos+i)=-1;
	322
	323	for (Int_t i = 0; i<np; i++) {
	324	TParticle * iparticle = (TParticle *) particles->At(i);
	325	imo = iparticle->GetFirstMother();
	326	kf = iparticle->GetPdgCode();
	327	ks = iparticle->GetStatusCode();
	328	if (ks != 3 &&
	329	KinematicSelection(iparticle,0))
	330	{
	331	nc++;
	332	p[0]=iparticle->Px();
	333	p[1]=iparticle->Py();
	334	p[2]=iparticle->Pz();
	335	p[3]=iparticle->Energy();
	336
	337	origin[0] = fVertex[0] + iparticle->Vx()/10; // [cm]
	338	origin[1] = fVertex[1] + iparticle->Vy()/10; // [cm]
	339	origin[2] = fVertex[2] + iparticle->Vz()/10; // [cm]
	340
	341	Float_t tof = kconv*iparticle->T();
	342	Int_t iparent = (imo > -1) ? newPos[imo] : -1;
	343	Int_t trackIt = (ks == 1) && fTrackIt;
	344	PushTrack(trackIt, iparent, kf,
	345	p[0], p[1], p[2], p[3],
	346	origin[0], origin[1], origin[2],
	347	tof,
	348	polar[0], polar[1], polar[2],
	349	kPPrimary, nt, fHerwig->GetEVWGT(), ks);
	350	KeepTrack(nt);
	351	newPos[i]=nt;
	352	fNprimaries++;
	353	} // end of if: selection of particle
	354	} // end of for: particle loop
	355	if (newPos) delete[] newPos;
	356	if (nc > 0) {
	357	jev+=nc;
	358	if (jev >= fNpart \|\| fNpart == -1) {
	359	fKineBias=Float_t(fNpart)/Float_t(fTrials);
	360	break;
	361	}
	362	}
	363	}
	364	//
	365	MakeHeader();
	366	//
	367	SetHighWaterMark(nt);
	368	// adjust weight due to kinematic selection
	369	AdjustWeights();
	370	// get cross-section
	371	fXsection=fHerwig->GetAVWGT();
	372	//printf(">> trials << %d\n",fTrials);
	373	}
	374
	375	Bool_t AliGenHerwig::CheckParton(TParticle* parton1, TParticle* parton2)
	376	{
	377	// Check the kinematic trigger condition
	378	//
	379	//Select events with parton max energy
	380	if(fPtHardMax < parton1->Pt()) return kFALSE;
	381
	382	// Select events within angular window
	383	Double_t eta[2];
	384	eta[0] = parton1->Eta();
	385	eta[1] = parton2->Eta();
	386	Double_t phi[2];
	387	phi[0] = parton1->Phi();
	388	phi[1] = parton2->Phi();
	389	Int_t pdg[2];
	390	pdg[0] = parton1->GetPdgCode();
	391	pdg[1] = parton2->GetPdgCode();
	392	printf("min %f, max %f\n",fPtHardMin, fPtHardMax);
	393	printf("Parton 1: %s, pT= %2.2f, eta = %1.2f, phi = %2.2f\n", parton1->GetName(),parton1->Pt(), eta[0],phi[0]*TMath::RadToDeg());
	394	printf("Parton 2: %s, pT= %2.2f, eta = %1.2f, phi = %2.2f\n", parton2->GetName(),parton2->Pt(), eta[1],phi[1]*TMath::RadToDeg());
	395
	396	if (fProcess == kHeJets) {
	397	//Check if one of the 2 outgoing partons are in the eta-phi window
	398	for(Int_t i = 0; i < 2; i++)
	399	if ((eta[i] < fEtaMaxParton && eta[i] > fEtaMinParton) &&
	400	(phi[i] < fPhiMaxParton && phi[i] > fPhiMinParton)) return kTRUE ;
	401	}
	402
	403	else {
	404	//Check if the gamma and the jet are in the eta-phi window
	405	Int_t igj = 0;
	406	Int_t ijj = 0;
	407	if(pdg[0] == 22) ijj=1;
	408	else igj=1;
	409	if ((eta[ijj] < fEtaMaxParton && eta[ijj] > fEtaMinParton) &&
	410	(phi[ijj] < fPhiMaxParton && phi[ijj] > fPhiMinParton)) {
	411
	412	if ((eta[igj] < fEtaMaxGamma && eta[igj] > fEtaMinGamma) &&
	413	(phi[igj] < fPhiMaxGamma && phi[igj] > fPhiMinGamma)) return kTRUE;
	414
	415	}
	416	}
	417
	418	return kFALSE ;
	419	}
	420
	421	void AliGenHerwig::AdjustWeights()
	422	{
	423	// Adjust the weights after generation of all events
	424	TParticle *part;
	425	Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
	426	for (Int_t i=0; i<ntrack; i++) {
	427	part= gAlice->GetMCApp()->Particle(i);
	428	part->SetWeight(part->GetWeight()*fKineBias);
	429	}
	430	}
	431
	432
	433	void AliGenHerwig::KeepFullEvent()
	434	{
	435	fKeep=1;
	436	}
	437
	438	Bool_t AliGenHerwig::DaughtersSelection(TParticle* iparticle, TClonesArray* particles)
	439	{
	440	//
	441	// Looks recursively if one of the daughters has been selected
	442	//
	443	// printf("\n Consider daughters %d:",iparticle->GetPdgCode());
	444	Int_t imin=-1;
	445	Int_t imax=-1;
	446	Int_t i;
	447	Bool_t hasDaughters= (iparticle->GetFirstDaughter() >=0);
	448	Bool_t selected=kFALSE;
	449	if (hasDaughters) {
	450	imin=iparticle->GetFirstDaughter();
	451	imax=iparticle->GetLastDaughter();
	452	for (i=imin; i<= imax; i++){
	453	TParticle * jparticle = (TParticle *) particles->At(i);
	454	Int_t ip=jparticle->GetPdgCode();
	455	if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
	456	selected=kTRUE; break;
	457	}
	458	if (DaughtersSelection(jparticle, particles)) {selected=kTRUE; break; }
	459	}
	460	} else {
	461	return kFALSE;
	462	}
	463
	464	return selected;
	465	}
	466
	467
	468	Bool_t AliGenHerwig::SelectFlavor(Int_t pid)
	469	{
	470	// Select flavor of particle
	471	// 0: all
	472	// 4: charm and beauty
	473	// 5: beauty
	474	if (fFlavor == 0) return kTRUE;
	475
	476	Int_t ifl=TMath::Abs(pid/100);
	477	if (ifl > 10) ifl/=10;
	478	return (fFlavor == ifl);
	479	}
	480
	481	Bool_t AliGenHerwig::Stable(TParticle* particle)
	482	{
	483	// Return true for a stable particle
	484	//
	485	Int_t kf = TMath::Abs(particle->GetPdgCode());
	486
	487	if ( (particle->GetFirstDaughter() < 0 ) \|\| (kf == 1000*fFlavor+122))
	488
	489	{
	490	return kTRUE;
	491	} else {
	492	return kFALSE;
	493	}
	494	}
	495
	496	void AliGenHerwig::FinishRun()
	497	{
	498	fHerwig->Hwefin();
	499	}
	500
	501	void AliGenHerwig::FinishRunJimmy()
	502	{
	503	fHerwig->Hwefin();
	504	fHerwig->Jmefin();
	505
	506	}
	507
	508
	509	void AliGenHerwig::MakeHeader()
	510	{
	511	//
	512	// Make header for the simulated event
	513	//
	514	if (fHeader) delete fHeader;
	515	fHeader = new AliGenHerwigEventHeader("Herwig");
	516	//
	517	// Event type
	518	((AliGenHerwigEventHeader*) fHeader)->SetProcessType(fHerwig->GetIHPRO());
	519	//
	520	// Number of trials
	521	((AliGenHerwigEventHeader*) fHeader)->SetTrials(fTrials);
	522	//
	523	// Event Vertex
	524	fHeader->SetPrimaryVertex(fVertex);
	525
	526	//
	527	// Number of primaries
	528	fHeader->SetNProduced(fNprimaries);
	529	// Pass header
	530	//
	531	AddHeader(fHeader);
	532	fHeader = 0x0;
	533	}