[u/mrichter/AliRoot.git] / EVGEN / AliGenParam.cxx

#include "AliGenParam.h"
#include "AliGenMUONlib.h"
#include "AliRun.h"
#include "TGeant3.h"
#include "AliPythia.h"
#include <TDirectory.h>
#include <TFile.h>
#include <TTree.h>
#include <stdlib.h>
#include <TMCParticle.h>

ClassImp(AliGenParam)

//------------------------------------------------------------

  //Begin_Html
  /*
    <img src="gif/AliGenParam.gif">
  */
  //End_Html

//____________________________________________________________
//____________________________________________________________
AliGenParam::AliGenParam()
                 :AliGenerator()
{
  fPtPara = 0;
  fYPara  = 0;
  fParam  = jpsi_p;
  fAnalog = analog;
}

//____________________________________________________________
AliGenParam::AliGenParam(Int_t npart, Param_t param) 
//				   Double_t (*PtPara)(Double_t*, Double_t*), 
//				   Double_t (*YPara) (Double_t* ,Double_t*))
    :AliGenerator(npart)
{
  //
  //  fName="HMESONpara";
  //  fTitle="Heavy Mesons Parametrisation";
  fPtParaFunc = AliGenMUONlib::GetPt(param);
  fYParaFunc  = AliGenMUONlib::GetY(param);
  fIpParaFunc = AliGenMUONlib::GetIp(param);
  
  fPtPara = 0;
  fYPara  = 0;
  fParam  = param;
  fAnalog = analog;
  fChildSelect.Set(5);
  for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
  ForceDecay();
}

//____________________________________________________________
AliGenParam::~AliGenParam()
{
    delete  fPtPara;
    delete  fYPara;
}

//____________________________________________________________
void AliGenParam::Init()
{
    SetMC(new AliPythia());
    fPythia= (AliPythia*) fgMCEvGen;

//  End of the test !!!
  //Begin_Html
  /*
    <img src="gif/AliGenParam.gif">
  */
  //End_Html
 
  fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0);
  fYPara  = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0);
  TF1* PtPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0);
  TF1* YPara  = new TF1("Y -Parametrization",fYParaFunc,-6,6,0);

//
// dN/dy| y=0
  Double_t y1=0;
  Double_t y2=0;
  
  fdNdy0=fYParaFunc(&y1,&y2);
//
// Integral over generation region
  Float_t IntYS  = YPara ->Integral(fYMin, fYMax);
  Float_t IntPt0 = PtPara->Integral(0,15);
  Float_t IntPtS = PtPara->Integral(fPtMin,fPtMax);
  Float_t PhiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi();
  if (fAnalog) {
     fYWgt  = IntYS/fdNdy0;
     fPtWgt = IntPtS/IntPt0;
     fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart;
  } else {
      fYWgt = IntYS/fdNdy0;
      fPtWgt = (fPtMax-fPtMin)/IntPt0;
      fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart;
  }
//
// particle decay related initialization
  fPythia->DefineParticles();
// semimuonic decays of charm and beauty
  fPythia->ForceDecay(fForceDecay);
//
    switch (fForceDecay) 
    {
    case semielectronic:
    case dielectron:
    case b_jpsi_dielectron:
    case b_psip_dielectron:
	fChildSelect[0]=11;	
	break;
    case semimuonic:
    case dimuon:
    case b_jpsi_dimuon:
    case b_psip_dimuon:
	fChildSelect[0]=13;
	break;
    case pitomu:
	fChildSelect[0]=13;
	break;
    case katomu:
	fChildSelect[0]=13;
	break;
    }

}

//____________________________________________________________
void AliGenParam::Generate()
{
// Generate 'npart' of heavy mesons (J/Psi, upsilon or phi) in the
// the desired theta, phi and momentum windows; Gaussian smearing 
// on the vertex is done if selected

  AliMC* pMC = AliMC::GetMC();

  Float_t polar[3]= {0,0,0};
  //
  Float_t origin[3], origin0[3];
  Float_t pt, pl, ptot;
  Float_t phi, theta;
  Float_t p[3];
  Float_t ty, xmt;
  Int_t i, nt, j;
  Float_t  wgtp, wgtch;
  Double_t dummy;
  //
  //
  Float_t random[6];
  for (j=0;j<3;j++) origin0[j]=fOrigin[j];
  if(fVertexSmear==perEvent) {
      pMC->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]));
      }
  }
  for(i=0;i<fNpart;i++) {
      while(1) {
//
// particle type
	  Int_t Ipart = fIpParaFunc();
	  fChildWeight=(fPythia->GetBraPart(Ipart))*fParentWeight;	  
	  Float_t am=fPythia->GetPMAS(fPythia->LuComp(Ipart),1);
	  pMC->Rndm(random,2);
//
// phi
	  phi=fPhiMin+random[0]*(fPhiMax-fPhiMin);
//
// y
	  ty=Float_t(TMath::TanH(fYPara->GetRandom()));
//
// pT
	  if (fAnalog) {
	      pt=fPtPara->GetRandom();
	      wgtp=fParentWeight;
	      wgtch=fChildWeight;
	  } else {
	      pt=fPtMin+random[1]*(fPtMax-fPtMin);
	      Double_t ptd=pt;
	      wgtp=fParentWeight*fPtParaFunc(& ptd, &dummy);
	      wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy);
	  }
	  xmt=sqrt(pt*pt+am*am);
	  pl=xmt*ty/sqrt(1.-ty*ty);
	  theta=TMath::ATan2(pt,pl);
	  if(theta<fThetaMin || theta>fThetaMax) continue;
	  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==perTrack) {
	      pMC->Rndm(random,6);
	      for (j=0;j<3;j++) {
		  origin0[j]=
		      fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
		      TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
	      }
	  }
	  
	  Int_t kg=fPythia->GetGeantCode(Ipart);
//
// parent

	  gAlice->
	      SetTrack(0,-1,kg,p,origin,polar,0,"Primary",nt,wgtp);
	  Int_t iparent=nt;
//
// use lujet to decay particle

	  Float_t energy=TMath::Sqrt(ptot*ptot+am*am);
	  fPythia->DecayParticle(Ipart,energy,theta,phi);
//	  fPythia->LuList(1);
	  
//
// select muons
	  TObjArray* particles = fPythia->GetPrimaries() ;
	  Int_t np = particles->GetEntriesFast();
	  for (Int_t i = 0; i<np; i++) {
	      TMCParticle *  iparticle = (TMCParticle *) particles->At(i);
	      Int_t kf = iparticle->GetKF();
//
// children
	      if (ChildSelected(TMath::Abs(kf)))
	      {
		  p[0]=iparticle->GetPx();
		  p[1]=iparticle->GetPy();
		  p[2]=iparticle->GetPz();
		  origin[0]=origin0[0]+iparticle->GetVx()/10;
		  origin[1]=origin0[1]+iparticle->GetVy()/10;
		  origin[2]=origin0[2]+iparticle->GetVz()/10;
		  gAlice->SetTrack(fTrackIt,iparent,fPythia->GetGeantCode(kf),
				   p,origin,polar,
  				   0,"Decay",nt,wgtch);
		  gAlice->KeepTrack(nt);
	      } // select muon
	  } // decay particle loop
	  break;
      } // kinematic selection
  } // event loop
}

Bool_t AliGenParam::ChildSelected(Int_t ip)
{
    for (Int_t i=0; i<5; i++)
    {
	if (fChildSelect[i]==ip) return kTRUE;
    }
    return kFALSE;
}

Bool_t AliGenParam::KinematicSelection(TMCParticle *particle)
{
    Float_t px=particle->GetPx();
    Float_t py=particle->GetPy();
    Float_t pz=particle->GetPz();
//
// momentum cut
    Float_t p=TMath::Sqrt(px*px+py*py+pz*pz);
    if (p > fPMax || p < fPMin) 
    {
//	printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	return kFALSE;
    }
    Float_t pt=TMath::Sqrt(px*px+py*py);
    
//
// theta cut
    Float_t  theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(p)));
    if (theta > fThetaMax || theta < fThetaMin) 
    {
//	printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	return kFALSE;
    }

    return kTRUE;
}
Commit	Line	Data
fe4da5cc	1	#include "AliGenParam.h"
	2	#include "AliGenMUONlib.h"
	3	#include "AliRun.h"
	4	#include "TGeant3.h"
	5	#include "AliPythia.h"
	6	#include <TDirectory.h>
	7	#include <TFile.h>
	8	#include <TTree.h>
	9	#include <stdlib.h>
	10	#include <TMCParticle.h>
	11
	12	ClassImp(AliGenParam)
	13
	14	//------------------------------------------------------------
	15
	16	//Begin_Html
	17	/*
	18	<img src="gif/AliGenParam.gif">
	19	*/
	20	//End_Html
	21
	22	//____________________________________________________________
	23	//____________________________________________________________
	24	AliGenParam::AliGenParam()
	25	:AliGenerator()
	26	{
	27	fPtPara = 0;
	28	fYPara = 0;
b7601ac4	29	fParam = jpsi_p;
b7601ac4	30	fAnalog = analog;
fe4da5cc	31	}
	32
	33	//____________________________________________________________
b7601ac4	34	AliGenParam::AliGenParam(Int_t npart, Param_t param)
fe4da5cc	35	// Double_t (PtPara)(Double_t, Double_t*),
	36	// Double_t (YPara) (Double_t ,Double_t*))
	37	:AliGenerator(npart)
	38	{
	39	//
	40	// fName="HMESONpara";
	41	// fTitle="Heavy Mesons Parametrisation";
b7601ac4	42	fPtParaFunc = AliGenMUONlib::GetPt(param);
	43	fYParaFunc = AliGenMUONlib::GetY(param);
	44	fIpParaFunc = AliGenMUONlib::GetIp(param);
fe4da5cc	45
	46	fPtPara = 0;
	47	fYPara = 0;
b7601ac4	48	fParam = param;
b7601ac4	49	fAnalog = analog;
fe4da5cc	50	fChildSelect.Set(5);
	51	for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
	52	ForceDecay();
	53	}
	54
	55	//____________________________________________________________
	56	AliGenParam::~AliGenParam()
	57	{
	58	delete fPtPara;
	59	delete fYPara;
	60	}
	61
	62	//____________________________________________________________
	63	void AliGenParam::Init()
	64	{
	65	SetMC(new AliPythia());
	66	fPythia= (AliPythia*) fgMCEvGen;
	67
	68	// End of the test !!!
	69	//Begin_Html
	70	/*
	71	<img src="gif/AliGenParam.gif">
	72	*/
	73	//End_Html
	74
b7601ac4	75	fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0);
	76	fYPara = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0);
	77	TF1* PtPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0);
	78	TF1* YPara = new TF1("Y -Parametrization",fYParaFunc,-6,6,0);
	79
fe4da5cc	80	//
	81	// dN/dy\| y=0
	82	Double_t y1=0;
	83	Double_t y2=0;
	84
	85	fdNdy0=fYParaFunc(&y1,&y2);
	86	//
	87	// Integral over generation region
b7601ac4	88	Float_t IntYS = YPara ->Integral(fYMin, fYMax);
	89	Float_t IntPt0 = PtPara->Integral(0,15);
	90	Float_t IntPtS = PtPara->Integral(fPtMin,fPtMax);
fe4da5cc	91	Float_t PhiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi();
	92	if (fAnalog) {
	93	fYWgt = IntYS/fdNdy0;
	94	fPtWgt = IntPtS/IntPt0;
	95	fParentWeight = fYWgtfPtWgtPhiWgt/fNpart;
	96	} else {
	97	fYWgt = IntYS/fdNdy0;
	98	fPtWgt = (fPtMax-fPtMin)/IntPt0;
	99	fParentWeight = fYWgtfPtWgtPhiWgt/fNpart;
	100	}
	101	//
	102	// particle decay related initialization
	103	fPythia->DefineParticles();
	104	// semimuonic decays of charm and beauty
	105	fPythia->ForceDecay(fForceDecay);
	106	//
	107	switch (fForceDecay)
	108	{
	109	case semielectronic:
	110	case dielectron:
	111	case b_jpsi_dielectron:
	112	case b_psip_dielectron:
	113	fChildSelect[0]=11;
	114	break;
	115	case semimuonic:
	116	case dimuon:
	117	case b_jpsi_dimuon:
	118	case b_psip_dimuon:
	119	fChildSelect[0]=13;
	120	break;
b7601ac4	121	case pitomu:
	122	fChildSelect[0]=13;
	123	break;
	124	case katomu:
	125	fChildSelect[0]=13;
	126	break;
fe4da5cc	127	}
	128
	129	}
	130
	131	//____________________________________________________________
	132	void AliGenParam::Generate()
	133	{
	134	// Generate 'npart' of heavy mesons (J/Psi, upsilon or phi) in the
	135	// the desired theta, phi and momentum windows; Gaussian smearing
	136	// on the vertex is done if selected
	137
	138	AliMC* pMC = AliMC::GetMC();
	139
	140	Float_t polar[3]= {0,0,0};
	141	//
	142	Float_t origin[3], origin0[3];
	143	Float_t pt, pl, ptot;
	144	Float_t phi, theta;
	145	Float_t p[3];
	146	Float_t ty, xmt;
	147	Int_t i, nt, j;
	148	Float_t wgtp, wgtch;
	149	Double_t dummy;
	150	//
	151	//
	152	Float_t random[6];
	153	for (j=0;j<3;j++) origin0[j]=fOrigin[j];
	154	if(fVertexSmear==perEvent) {
	155	pMC->Rndm(random,6);
	156	for (j=0;j<3;j++) {
	157	origin0[j]+=fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
	158	TMath::Sqrt(-2TMath::Log(random[2j+1]));
	159	}
	160	}
	161	for(i=0;i<fNpart;i++) {
	162	while(1) {
	163	//
	164	// particle type
	165	Int_t Ipart = fIpParaFunc();
	166	fChildWeight=(fPythia->GetBraPart(Ipart))*fParentWeight;
	167	Float_t am=fPythia->GetPMAS(fPythia->LuComp(Ipart),1);
	168	pMC->Rndm(random,2);
	169	//
	170	// phi
	171	phi=fPhiMin+random[0]*(fPhiMax-fPhiMin);
	172	//
	173	// y
	174	ty=Float_t(TMath::TanH(fYPara->GetRandom()));
	175	//
	176	// pT
	177	if (fAnalog) {
	178	pt=fPtPara->GetRandom();
	179	wgtp=fParentWeight;
	180	wgtch=fChildWeight;
	181	} else {
	182	pt=fPtMin+random[1]*(fPtMax-fPtMin);
	183	Double_t ptd=pt;
	184	wgtp=fParentWeight*fPtParaFunc(& ptd, &dummy);
	185	wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy);
	186	}
	187	xmt=sqrt(ptpt+amam);
	188	pl=xmtty/sqrt(1.-tyty);
	189	theta=TMath::ATan2(pt,pl);
	190	if(theta<fThetaMin \|\| theta>fThetaMax) continue;
191	ptot=TMath::Sqrt(ptpt+plpl);
192	if(ptot<fPMin \|\| ptot>fPMax) continue;
193	p[0]=pt*TMath::Cos(phi);
194	p[1]=pt*TMath::Sin(phi);
195	p[2]=pl;
196	if(fVertexSmear==perTrack) {
197	pMC->Rndm(random,6);
198	for (j=0;j<3;j++) {
199	origin0[j]=
200	fOrigin[j]+fOsigma[j]TMath::Cos(2random[2j]TMath::Pi())*
201	TMath::Sqrt(-2TMath::Log(random[2j+1]));
202	}
203	}
204
205	Int_t kg=fPythia->GetGeantCode(Ipart);
206	//
207	// parent
208
209	gAlice->
210	SetTrack(0,-1,kg,p,origin,polar,0,"Primary",nt,wgtp);
211	Int_t iparent=nt;
212	//
213	// use lujet to decay particle
214
215	Float_t energy=TMath::Sqrt(ptotptot+amam);
216	fPythia->DecayParticle(Ipart,energy,theta,phi);
b7601ac4	217	// fPythia->LuList(1);
b7601ac4	218
fe4da5cc	219	//
	220	// select muons
	221	TObjArray* particles = fPythia->GetPrimaries() ;
	222	Int_t np = particles->GetEntriesFast();
	223	for (Int_t i = 0; i<np; i++) {
	224	TMCParticle * iparticle = (TMCParticle *) particles->At(i);
	225	Int_t kf = iparticle->GetKF();
	226	//
	227	// children
	228	if (ChildSelected(TMath::Abs(kf)))
	229	{
	230	p[0]=iparticle->GetPx();
	231	p[1]=iparticle->GetPy();
	232	p[2]=iparticle->GetPz();
	233	origin[0]=origin0[0]+iparticle->GetVx()/10;
	234	origin[1]=origin0[1]+iparticle->GetVy()/10;
	235	origin[2]=origin0[2]+iparticle->GetVz()/10;
b7601ac4	236	gAlice->SetTrack(fTrackIt,iparent,fPythia->GetGeantCode(kf),
fe4da5cc	237	p,origin,polar,
	238	0,"Decay",nt,wgtch);
	239	gAlice->KeepTrack(nt);
	240	} // select muon
	241	} // decay particle loop
	242	break;
	243	} // kinematic selection
	244	} // event loop
	245	}
	246
	247	Bool_t AliGenParam::ChildSelected(Int_t ip)
	248	{
	249	for (Int_t i=0; i<5; i++)
	250	{
	251	if (fChildSelect[i]==ip) return kTRUE;
	252	}
	253	return kFALSE;
	254	}
	255
	256	Bool_t AliGenParam::KinematicSelection(TMCParticle *particle)
	257	{
	258	Float_t px=particle->GetPx();
	259	Float_t py=particle->GetPy();
	260	Float_t pz=particle->GetPz();
	261	//
	262	// momentum cut
	263	Float_t p=TMath::Sqrt(pxpx+pypy+pz*pz);
	264	if (p > fPMax \|\| p < fPMin)
	265	{
	266	// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
	267	return kFALSE;
	268	}
	269	Float_t pt=TMath::Sqrt(pxpx+pypy);
	270
	271	//
	272	// theta cut
	273	Float_t theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(p)));
	274	if (theta > fThetaMax \|\| theta < fThetaMin)
	275	{
	276	// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
	277	return kFALSE;
	278	}
	279
	280	return kTRUE;
	281	}
	282
	283
	284
	285