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

/*
$Log$
Revision 1.2  2002/07/19 11:43:10  morsch
- Write full stack.
- Use SetTrack passing energy.

Revision 1.1  2002/07/16 11:33:26  morsch
First commit.

*/


// 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 "AliGenHerwig.h"
#include "AliRun.h"

#include <TParticle.h>
#include "THerwig6.h"


 ClassImp(AliGenHerwig)

AliGenHerwig::AliGenHerwig()
{
// Constructor
}

AliGenHerwig::AliGenHerwig(Int_t npart)
    :AliGenMC(npart)
{
    SetBeamMomenta();
    SetTarget();
    SetProjectile();
    SetStrucFunc(kGRVLO98);
    fKeep=0;
    fTrigger=0;
    fDecaysOff=1;
    fSelectAll=0;
    fFlavor=0;
    fPtHardMin=10.;
    fPtRMS=0.0;
    fEnSoft=1.0;
    fMaxPr=1;
    fMaxErrors=1000;
//  Set random number
    if (!sRandom) sRandom=fRandom;
}

AliGenHerwig::AliGenHerwig(const AliGenHerwig & Herwig)
{
// copy constructor
}


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

void AliGenHerwig::Init()
{
// Initialisation
  fTarget.Resize(8);
  fProjectile.Resize(8);
  SetMC(new THerwig6());
  fHerwig=(THerwig6*) fgMCEvGen;
  // initialize common blocks
  fHerwig->Initialize(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);
  // compute parameter dependent constants
  fHerwig->PrepareRun();
}

void AliGenHerwig::InitPDF()
{
  switch(fStrucFunc)
    {
    case kGRVLO:
      fModPDF=5;
      fAutPDF="GRV";
      break;
    case kGRVHO:
      fModPDF=6;
      fAutPDF="GRV";
      break;
    case kGRVLO98:
      fModPDF=12;
      fAutPDF="GRV";
      break;
    case kMRSDminus:
      fModPDF=31;
      fAutPDF="MRS";
      break;
    case kMRSD0:
      fModPDF=30;
      fAutPDF="MRS";
      break;
    case kMRSG:
      fModPDF=41;
      fAutPDF="MRS";
      break;
    case kMRSTcgLO:
      fModPDF=72;
      fAutPDF="MRS";
      break;
    case kCTEQ4M:
      fModPDF=34;
      fAutPDF="CTEQ";
      break;
    case kCTEQ5L:
      fModPDF=46;
      fAutPDF="CTEQ";
      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 origin0[3]=  {0,0,0};
  Float_t 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 jev=0;
  Int_t j, kf, ks, imo;
  kf=0;
  
  if(!particles) particles=new TClonesArray("TParticle",10000);
  
  fTrials=0;
  for (j=0;j<3;j++) origin0[j]=fOrigin[j];
  if(fVertexSmear==kPerEvent) {
    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]));
    }
  }
  
  while(1)
    {
	fHerwig->GenerateEvent();
	fTrials++;
	fHerwig->ImportParticles(particles,"All");
	Int_t np = particles->GetEntriesFast()-1;
	if (np == 0 ) continue;
	
	Int_t nc=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]=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();
		Int_t   iparent = (imo > -1) ? newPos[imo] : -1;
		Int_t   trackIt = (ks == 1) && fTrackIt;
		gAlice->SetTrack(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, 1., ks);
		KeepTrack(nt);
		newPos[i]=nt;
	    } // end of if: selection of particle
	} // end of for: particle loop
	if (newPos) delete[] newPos;
	printf("\n I've put %i particles on the stack \n",nc);
	//      MakeHeader();
	printf("nc: %d %d\n", nc, fNpart);
	
	if (nc > 0) {
	    jev+=nc;
	    if (jev >= fNpart || fNpart == -1) {
		fKineBias=Float_t(fNpart)/Float_t(fTrials);
		printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
		break;
	    }
	}
    }
  SetHighWaterMark(nt);
//  adjust weight due to kinematic selection
  AdjustWeights();
//  get cross-section
  fXsection=fHerwig->GetAVWGT();
}

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


AliGenHerwig& AliGenHerwig::operator=(const  AliGenHerwig& rhs)
{
// Assignment operator
    return *this;
}


extern "C" {
  Double_t hwr_() {return sRandom->Rndm();}
}
Commit	Line	Data
b46943fe	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	$Log$
1784616d	18	Revision 1.2 2002/07/19 11:43:10 morsch
	19	- Write full stack.
	20	- Use SetTrack passing energy.
	21
dc2691e2	22	Revision 1.1 2002/07/16 11:33:26 morsch
	23	First commit.
	24
b46943fe	25	*/
	26
	27
	28
	29	// Generator using Herwig as an external generator
	30	// The main Herwig options are accessable for the user through this interface.
	31	// Uses the THerwig implementation of TGenerator.
	32
b46943fe	33	#include "AliGenHerwig.h"
	34	#include "AliRun.h"
	35
	36	#include <TParticle.h>
	37	#include "THerwig6.h"
	38
	39
	40	ClassImp(AliGenHerwig)
	41
	42	AliGenHerwig::AliGenHerwig()
	43	{
	44	// Constructor
	45	}
	46
	47	AliGenHerwig::AliGenHerwig(Int_t npart)
dc2691e2	48	:AliGenMC(npart)
b46943fe	49	{
	50	SetBeamMomenta();
	51	SetTarget();
	52	SetProjectile();
	53	SetStrucFunc(kGRVLO98);
	54	fKeep=0;
	55	fTrigger=0;
	56	fDecaysOff=1;
	57	fSelectAll=0;
	58	fFlavor=0;
	59	fPtHardMin=10.;
	60	fPtRMS=0.0;
	61	fEnSoft=1.0;
	62	fMaxPr=1;
	63	fMaxErrors=1000;
	64	// Set random number
	65	if (!sRandom) sRandom=fRandom;
	66	}
	67
	68	AliGenHerwig::AliGenHerwig(const AliGenHerwig & Herwig)
	69	{
	70	// copy constructor
	71	}
	72
	73
	74	AliGenHerwig::~AliGenHerwig()
	75	{
	76	// Destructor
	77	}
	78
	79	void AliGenHerwig::Init()
	80	{
	81	// Initialisation
	82	fTarget.Resize(8);
	83	fProjectile.Resize(8);
	84	SetMC(new THerwig6());
	85	fHerwig=(THerwig6*) fgMCEvGen;
	86	// initialize common blocks
	87	fHerwig->Initialize(fProjectile, fTarget, fMomentum1, fMomentum2, fProcess);
	88	// reset parameters according to user needs
	89	InitPDF();
	90	fHerwig->SetPTMIN(fPtHardMin);
	91	fHerwig->SetPTRMS(fPtRMS);
	92	fHerwig->SetMAXPR(fMaxPr);
	93	fHerwig->SetMAXER(fMaxErrors);
	94	fHerwig->SetENSOF(fEnSoft);
	95	// compute parameter dependent constants
	96	fHerwig->PrepareRun();
	97	}
	98
	99	void AliGenHerwig::InitPDF()
	100	{
	101	switch(fStrucFunc)
	102	{
	103	case kGRVLO:
	104	fModPDF=5;
	105	fAutPDF="GRV";
	106	break;
	107	case kGRVHO:
	108	fModPDF=6;
	109	fAutPDF="GRV";
	110	break;
	111	case kGRVLO98:
	112	fModPDF=12;
113	fAutPDF="GRV";
114	break;
115	case kMRSDminus:
116	fModPDF=31;
117	fAutPDF="MRS";
118	break;
119	case kMRSD0:
120	fModPDF=30;
121	fAutPDF="MRS";
122	break;
123	case kMRSG:
124	fModPDF=41;
125	fAutPDF="MRS";
126	break;
127	case kMRSTcgLO:
128	fModPDF=72;
129	fAutPDF="MRS";
130	break;
131	case kCTEQ4M:
132	fModPDF=34;
133	fAutPDF="CTEQ";
134	break;
135	case kCTEQ5L:
136	fModPDF=46;
137	fAutPDF="CTEQ";
138	break;
139	}
140	fAutPDF.Resize(20);
141	fHerwig->SetMODPDF(1,fModPDF);
142	fHerwig->SetMODPDF(2,fModPDF);
143	fHerwig->SetAUTPDF(1,fAutPDF);
144	fHerwig->SetAUTPDF(2,fAutPDF);
145	}
146
147	void AliGenHerwig::Generate()
148	{
149	// Generate one event
150
151	Float_t polar[3] = {0,0,0};
152	Float_t origin[3]= {0,0,0};
153	Float_t origin0[3]= {0,0,0};
dc2691e2	154	Float_t p[4], random[6];
b46943fe	155
	156	static TClonesArray *particles;
	157	// converts from mm/c to s
	158	const Float_t kconv=0.001/2.999792458e8;
	159	//
	160	Int_t nt=0;
	161	Int_t jev=0;
	162	Int_t j, kf, ks, imo;
	163	kf=0;
	164
	165	if(!particles) particles=new TClonesArray("TParticle",10000);
	166
	167	fTrials=0;
	168	for (j=0;j<3;j++) origin0[j]=fOrigin[j];
	169	if(fVertexSmear==kPerEvent) {
	170	Rndm(random,6);
	171	for (j=0;j<3;j++) {
	172	origin0[j]+=fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
	173	TMath::Sqrt(-2TMath::Log(random[2j+1]));
	174	}
	175	}
dc2691e2	176
b46943fe	177	while(1)
b46943fe	178	{
dc2691e2	179	fHerwig->GenerateEvent();
	180	fTrials++;
	181	fHerwig->ImportParticles(particles,"All");
	182	Int_t np = particles->GetEntriesFast()-1;
	183	if (np == 0 ) continue;
	184
	185	Int_t nc=0;
	186
	187	Int_t * newPos = new Int_t[np];
	188	for (Int_t i = 0; i<np; i++) *(newPos+i)=-1;
	189
	190	for (Int_t i = 0; i<np; i++) {
	191	TParticle * iparticle = (TParticle *) particles->At(i);
	192	imo = iparticle->GetFirstMother();
	193	kf = iparticle->GetPdgCode();
	194	ks = iparticle->GetStatusCode();
	195	if (ks != 3 &&
	196	KinematicSelection(iparticle,0))
	197	{
	198	nc++;
	199	p[0]=iparticle->Px();
	200	p[1]=iparticle->Py();
	201	p[2]=iparticle->Pz();
	202	p[3]=iparticle->Energy();
	203	origin[0]=origin0[0]+iparticle->Vx()/10;
	204	origin[1]=origin0[1]+iparticle->Vy()/10;
	205	origin[2]=origin0[2]+iparticle->Vz()/10;
	206	Float_t tof = kconv*iparticle->T();
	207	Int_t iparent = (imo > -1) ? newPos[imo] : -1;
	208	Int_t trackIt = (ks == 1) && fTrackIt;
	209	gAlice->SetTrack(trackIt, iparent, kf,
	210	p[0], p[1], p[2], p[3],
	211	origin[0], origin[1], origin[2],
	212	tof,
	213	polar[0], polar[1], polar[2],
	214	kPPrimary, nt, 1., ks);
	215	KeepTrack(nt);
	216	newPos[i]=nt;
	217	} // end of if: selection of particle
	218	} // end of for: particle loop
	219	if (newPos) delete[] newPos;
	220	printf("\n I've put %i particles on the stack \n",nc);
	221	// MakeHeader();
	222	printf("nc: %d %d\n", nc, fNpart);
	223
	224	if (nc > 0) {
	225	jev+=nc;
	226	if (jev >= fNpart \|\| fNpart == -1) {
	227	fKineBias=Float_t(fNpart)/Float_t(fTrials);
	228	printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
	229	break;
	230	}
b46943fe	231	}
b46943fe	232	}
dc2691e2	233	SetHighWaterMark(nt);
b46943fe	234	// adjust weight due to kinematic selection
dc2691e2	235	AdjustWeights();
b46943fe	236	// get cross-section
dc2691e2	237	fXsection=fHerwig->GetAVWGT();
b46943fe	238	}
	239
	240	void AliGenHerwig::AdjustWeights()
	241	{
	242	// Adjust the weights after generation of all events
	243	TParticle *part;
	244	Int_t ntrack=gAlice->GetNtrack();
	245	for (Int_t i=0; i<ntrack; i++) {
	246	part= gAlice->Particle(i);
	247	part->SetWeight(part->GetWeight()*fKineBias);
	248	}
	249	}
	250
	251
	252	void AliGenHerwig::KeepFullEvent()
	253	{
	254	fKeep=1;
	255	}
	256
	257	Bool_t AliGenHerwig::DaughtersSelection(TParticle* iparticle, TClonesArray* particles)
	258	{
	259	//
	260	// Looks recursively if one of the daughters has been selected
	261	//
	262	// printf("\n Consider daughters %d:",iparticle->GetPdgCode());
	263	Int_t imin=-1;
	264	Int_t imax=-1;
	265	Int_t i;
	266	Bool_t hasDaughters= (iparticle->GetFirstDaughter() >=0);
	267	Bool_t selected=kFALSE;
	268	if (hasDaughters) {
	269	imin=iparticle->GetFirstDaughter();
	270	imax=iparticle->GetLastDaughter();
	271	for (i=imin; i<= imax; i++){
	272	TParticle * jparticle = (TParticle *) particles->At(i);
	273	Int_t ip=jparticle->GetPdgCode();
	274	if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
	275	selected=kTRUE; break;
	276	}
	277	if (DaughtersSelection(jparticle, particles)) {selected=kTRUE; break; }
	278	}
	279	} else {
	280	return kFALSE;
	281	}
	282
	283	return selected;
	284	}
	285
	286
	287	Bool_t AliGenHerwig::SelectFlavor(Int_t pid)
	288	{
	289	// Select flavor of particle
	290	// 0: all
	291	// 4: charm and beauty
	292	// 5: beauty
	293	if (fFlavor == 0) return kTRUE;
	294
	295	Int_t ifl=TMath::Abs(pid/100);
	296	if (ifl > 10) ifl/=10;
	297	return (fFlavor == ifl);
	298	}
	299
	300	Bool_t AliGenHerwig::Stable(TParticle* particle)
	301	{
302	// Return true for a stable particle
303	//
304	Int_t kf = TMath::Abs(particle->GetPdgCode());
305
306	if ( (particle->GetFirstDaughter() < 0 ) \|\| (kf == 1000*fFlavor+122))
307
308	{
309	return kTRUE;
310	} else {
311	return kFALSE;
312	}
313	}
314
315	void AliGenHerwig::FinishRun()
316	{
317	fHerwig->Hwefin();
318	}
319
dc2691e2	320
b46943fe	321	AliGenHerwig& AliGenHerwig::operator=(const AliGenHerwig& rhs)
	322	{
	323	// Assignment operator
	324	return *this;
	325	}
	326
	327
	328	extern "C" {
	329	Double_t hwr_() {return sRandom->Rndm();}
	330	}