[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 "AliGenHerwig.h"
#include "AliRun.h"

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

#include "Riostream.h"

ClassImp(AliGenHerwig)

static TRandom * sRandom;

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)
    :AliGenMC(Herwig)
{
// Copy constructor
    Herwig.Copy(*this);
}


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

void AliGenHerwig::Init()
{
// Initialisation
  fTarget.Resize(8);
  fProjectile.Resize(8);
  SetMC(new THerwig6());
  fHerwig=(THerwig6*) fMCEvGen;
  // 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;
    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 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->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, 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
    rhs.Copy(*this);
    return (*this);
}


extern "C" {
  Double_t hwr_() {return sRandom->Rndm();}
}
Commit	Line	Data
618e1dc0	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
7cdba479	16	/* $Id$ */
618e1dc0	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	#include "AliGenHerwig.h"
	24	#include "AliRun.h"
	25
	26	#include <TParticle.h>
	27	#include "THerwig6.h"
	28
	29	#include "Riostream.h"
	30
014a9521	31	ClassImp(AliGenHerwig)
618e1dc0	32
7cdba479	33	static TRandom * sRandom;
7cdba479	34
618e1dc0	35	AliGenHerwig::AliGenHerwig()
	36	{
	37	// Constructor
	38	}
	39
	40	AliGenHerwig::AliGenHerwig(Int_t npart)
	41	:AliGenMC(npart)
	42	{
	43	SetBeamMomenta();
	44	SetTarget();
	45	SetProjectile();
	46	SetStrucFunc(kGRVLO98);
	47	fKeep=0;
	48	fTrigger=0;
	49	fDecaysOff=1;
	50	fSelectAll=0;
	51	fFlavor=0;
	52	fPtHardMin=10.;
	53	fPtRMS=0.0;
	54	fEnSoft=1.0;
	55	fMaxPr=1;
	56	fMaxErrors=1000;
	57	// Set random number
	58	if (!sRandom) sRandom=fRandom;
	59	}
	60
	61	AliGenHerwig::AliGenHerwig(const AliGenHerwig & Herwig)
014a9521	62	:AliGenMC(Herwig)
618e1dc0	63	{
014a9521	64	// Copy constructor
014a9521	65	Herwig.Copy(*this);
618e1dc0	66	}
	67
	68
	69	AliGenHerwig::~AliGenHerwig()
	70	{
	71	// Destructor
	72	}
	73
	74	void AliGenHerwig::Init()
	75	{
	76	// Initialisation
	77	fTarget.Resize(8);
	78	fProjectile.Resize(8);
	79	SetMC(new THerwig6());
d274cd60	80	fHerwig=(THerwig6*) fMCEvGen;
618e1dc0	81	// initialize common blocks
	82	fHerwig->Initialize(fProjectile, fTarget, fMomentum1, fMomentum2, fProcess);
	83	// reset parameters according to user needs
	84	InitPDF();
	85	fHerwig->SetPTMIN(fPtHardMin);
	86	fHerwig->SetPTRMS(fPtRMS);
	87	fHerwig->SetMAXPR(fMaxPr);
	88	fHerwig->SetMAXER(fMaxErrors);
	89	fHerwig->SetENSOF(fEnSoft);
	90	// compute parameter dependent constants
	91	fHerwig->PrepareRun();
	92	}
	93
	94	void AliGenHerwig::InitPDF()
	95	{
	96	switch(fStrucFunc)
	97	{
	98	case kGRVLO:
	99	fModPDF=5;
	100	fAutPDF="GRV";
	101	break;
	102	case kGRVHO:
	103	fModPDF=6;
	104	fAutPDF="GRV";
	105	break;
	106	case kGRVLO98:
	107	fModPDF=12;
	108	fAutPDF="GRV";
	109	break;
	110	case kMRSDminus:
	111	fModPDF=31;
	112	fAutPDF="MRS";
	113	break;
	114	case kMRSD0:
	115	fModPDF=30;
	116	fAutPDF="MRS";
	117	break;
	118	case kMRSG:
	119	fModPDF=41;
	120	fAutPDF="MRS";
	121	break;
	122	case kMRSTcgLO:
	123	fModPDF=72;
	124	fAutPDF="MRS";
	125	break;
	126	case kCTEQ4M:
	127	fModPDF=34;
	128	fAutPDF="CTEQ";
	129	break;
	130	case kCTEQ5L:
	131	fModPDF=46;
	132	fAutPDF="CTEQ";
	133	break;
	134	default:
	135	cerr << "This structure function is not inplemented " << fStrucFunc << endl;
	136	break;
	137	}
	138	fAutPDF.Resize(20);
	139	fHerwig->SetMODPDF(1,fModPDF);
	140	fHerwig->SetMODPDF(2,fModPDF);
	141	fHerwig->SetAUTPDF(1,fAutPDF);
	142	fHerwig->SetAUTPDF(2,fAutPDF);
	143	}
	144
145	void AliGenHerwig::Generate()
146	{
147	// Generate one event
148
149	Float_t polar[3] = {0,0,0};
150	Float_t origin[3]= {0,0,0};
151	Float_t origin0[3]= {0,0,0};
152	Float_t p[4], random[6];
153
154	static TClonesArray *particles;
155	// converts from mm/c to s
156	const Float_t kconv=0.001/2.999792458e8;
157	//
158	Int_t nt=0;
159	Int_t jev=0;
160	Int_t j, kf, ks, imo;
161	kf=0;
162
163	if(!particles) particles=new TClonesArray("TParticle",10000);
164
165	fTrials=0;
166	for (j=0;j<3;j++) origin0[j]=fOrigin[j];
167	if(fVertexSmear==kPerEvent) {
168	Rndm(random,6);
169	for (j=0;j<3;j++) {
170	origin0[j]+=fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
171	TMath::Sqrt(-2TMath::Log(random[2j+1]));
172	}
173	}
174
175	while(1)
176	{
177	fHerwig->GenerateEvent();
178	fTrials++;
179	fHerwig->ImportParticles(particles,"All");
180	Int_t np = particles->GetEntriesFast()-1;
181	if (np == 0 ) continue;
182
183	Int_t nc=0;
184
185	Int_t * newPos = new Int_t[np];
186	for (Int_t i = 0; i<np; i++) *(newPos+i)=-1;
187
188	for (Int_t i = 0; i<np; i++) {
189	TParticle * iparticle = (TParticle *) particles->At(i);
190	imo = iparticle->GetFirstMother();
191	kf = iparticle->GetPdgCode();
192	ks = iparticle->GetStatusCode();
193	if (ks != 3 &&
194	KinematicSelection(iparticle,0))
195	{
196	nc++;
197	p[0]=iparticle->Px();
198	p[1]=iparticle->Py();
199	p[2]=iparticle->Pz();
200	p[3]=iparticle->Energy();
201	origin[0]=origin0[0]+iparticle->Vx()/10;
202	origin[1]=origin0[1]+iparticle->Vy()/10;
203	origin[2]=origin0[2]+iparticle->Vz()/10;
204	Float_t tof = kconv*iparticle->T();
205	Int_t iparent = (imo > -1) ? newPos[imo] : -1;
206	Int_t trackIt = (ks == 1) && fTrackIt;
642f15cf	207	gAlice->PushTrack(trackIt, iparent, kf,
618e1dc0	208	p[0], p[1], p[2], p[3],
	209	origin[0], origin[1], origin[2],
	210	tof,
	211	polar[0], polar[1], polar[2],
	212	kPPrimary, nt, 1., ks);
	213	KeepTrack(nt);
	214	newPos[i]=nt;
	215	} // end of if: selection of particle
	216	} // end of for: particle loop
	217	if (newPos) delete[] newPos;
	218	printf("\n I've put %i particles on the stack \n",nc);
	219	// MakeHeader();
	220	printf("nc: %d %d\n", nc, fNpart);
	221
	222	if (nc > 0) {
	223	jev+=nc;
	224	if (jev >= fNpart \|\| fNpart == -1) {
	225	fKineBias=Float_t(fNpart)/Float_t(fTrials);
	226	printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
	227	break;
	228	}
	229	}
	230	}
	231	SetHighWaterMark(nt);
	232	// adjust weight due to kinematic selection
	233	AdjustWeights();
	234	// get cross-section
	235	fXsection=fHerwig->GetAVWGT();
	236	}
	237
	238	void AliGenHerwig::AdjustWeights()
	239	{
	240	// Adjust the weights after generation of all events
	241	TParticle *part;
	242	Int_t ntrack=gAlice->GetNtrack();
	243	for (Int_t i=0; i<ntrack; i++) {
	244	part= gAlice->Particle(i);
	245	part->SetWeight(part->GetWeight()*fKineBias);
	246	}
	247	}
	248
	249
	250	void AliGenHerwig::KeepFullEvent()
	251	{
	252	fKeep=1;
	253	}
	254
	255	Bool_t AliGenHerwig::DaughtersSelection(TParticle* iparticle, TClonesArray* particles)
	256	{
	257	//
	258	// Looks recursively if one of the daughters has been selected
	259	//
	260	// printf("\n Consider daughters %d:",iparticle->GetPdgCode());
	261	Int_t imin=-1;
	262	Int_t imax=-1;
	263	Int_t i;
	264	Bool_t hasDaughters= (iparticle->GetFirstDaughter() >=0);
	265	Bool_t selected=kFALSE;
	266	if (hasDaughters) {
	267	imin=iparticle->GetFirstDaughter();
	268	imax=iparticle->GetLastDaughter();
	269	for (i=imin; i<= imax; i++){
	270	TParticle * jparticle = (TParticle *) particles->At(i);
	271	Int_t ip=jparticle->GetPdgCode();
272	if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
273	selected=kTRUE; break;
274	}
275	if (DaughtersSelection(jparticle, particles)) {selected=kTRUE; break; }
276	}
277	} else {
278	return kFALSE;
279	}
280
281	return selected;
282	}
283
284
285	Bool_t AliGenHerwig::SelectFlavor(Int_t pid)
286	{
287	// Select flavor of particle
288	// 0: all
289	// 4: charm and beauty
290	// 5: beauty
291	if (fFlavor == 0) return kTRUE;
292
293	Int_t ifl=TMath::Abs(pid/100);
294	if (ifl > 10) ifl/=10;
295	return (fFlavor == ifl);
296	}
297
298	Bool_t AliGenHerwig::Stable(TParticle* particle)
299	{
300	// Return true for a stable particle
301	//
302	Int_t kf = TMath::Abs(particle->GetPdgCode());
303
304	if ( (particle->GetFirstDaughter() < 0 ) \|\| (kf == 1000*fFlavor+122))
305
306	{
307	return kTRUE;
308	} else {
309	return kFALSE;
310	}
311	}
312
313	void AliGenHerwig::FinishRun()
314	{
315	fHerwig->Hwefin();
316	}
317
318
319	AliGenHerwig& AliGenHerwig::operator=(const AliGenHerwig& rhs)
320	{
321	// Assignment operator
014a9521	322	rhs.Copy(*this);
014a9521	323	return (*this);
618e1dc0	324	}
	325
	326
	327	extern "C" {
	328	Double_t hwr_() {return sRandom->Rndm();}
	329	}