[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)
{
// copy constructor
}


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