[u/mrichter/AliRoot.git] / RICH / AliRICHTracker.cxx

#include "AliRICHTracker.h"
#include <AliESD.h>
#include <TVector3.h>
#include <TTree.h>
#include "AliRICH.h"
#include "AliRICHHelix.h"
#include <AliMagF.h>
#include "AliRICHRecon.h"
#include <AliStack.h>
#include <TParticle.h>
#include <TMath.h>
#include <AliRun.h>
ClassImp(AliRICHTracker)
//__________________________________________________________________________________________________
Int_t AliRICHTracker::PropagateBack(AliESD *pESD)
{
// Interface callback methode invoked by AliRecontruction during tracking after TOF
// It steers to different way to provide the final reconstructed information sutable for analisys:
// 1. AliESD  - reconstructed tracks are used     
// 2. RICH private ntuple for debug- stack particles used instead of reconstructed tracks     
  AliDebug(1,"Start pattern recognition");
  if(pESD->GetNumberOfTracks()) {
    Int_t iNtracks=pESD->GetNumberOfTracks();
    AliDebug(1,Form("Start with %i tracks",iNtracks));
    AliRICH *pRich=((AliRICH*)gAlice->GetDetector("RICH"));  
    for(Int_t iTrackN=0;iTrackN<iNtracks;iTrackN++){//ESD tracks loop
      RecWithESD(pESD,pRich,iTrackN);
    }
  }
  else RecWithStack(0);
  AliDebug(1,"Stop pattern recognition");
  return 0; // error code: 0=no error;
}//PropagateBack()
//__________________________________________________________________________________________________
void AliRICHTracker::RecWithESD(AliESD *pESD,AliRICH *pRich,Int_t iTrackN)
{
//recontruction from ESD- primary way to reconstruct particle ID signal from tracks provided by core detectors
    fnPhotBKG = 0;

    Double_t fField=GetFieldMap()->SolenoidField()/10;// magnetic field in Tesla
    AliESDtrack *pTrack = pESD->GetTrack(iTrackN);// get next reconstructed track
//  if((pTrack->GetStatus()&AliESDtrack::kTOFout)==0) continue; //ignore tracks not recontructed by TOF
//    pTrack->GetXYZ(xb); 
//    pTrack->GetPxPyPz(pb); 
    Int_t status=pTrack->GetStatus()&AliESDtrack::kTOFout;//get running track parameters
    Int_t charge = (Int_t)(-TMath::Sign(1.,pTrack->GetSign()*fField));
    AliDebug(1,Form("Track %i pmod=%f charge=%i stat=%i",iTrackN,pTrack->GetP(),charge,status));
    AliRICHHelix helix(pTrack->X3(),pTrack->P3(),charge,fField);   
    Int_t iChamber=helix.RichIntersect(pRich->P());        
    AliDebug(1,Form("intersection with %i chamber found",iChamber));
    if(!iChamber) return;//intersection with no chamber found
//find MIP cluster candidate (cluster which is closest to track intersection point)    
    Double_t distMip=9999,distX=0,distY=0; //min distance between clusters and track position on PC 
    Int_t iMipId=0; //index of that min distance cluster
    Double_t chargeMip=0; //charge of the MIP
    for(Int_t iClusN=0;iClusN<pRich->Clusters(iChamber)->GetEntries();iClusN++){//clusters loop for intersected chamber
      AliRICHCluster *pClus=(AliRICHCluster*)pRich->Clusters(iChamber)->UncheckedAt(iClusN);//get pointer to current cluster
      Double_t distCurrent=pClus->DistTo(helix.PosPc());//distance between current cluster and helix intersection with PC
      if(distCurrent<distMip){
        distMip=distCurrent;
        iMipId=iClusN;
        distX=pClus->DistX(helix.PosPc());
        distY=pClus->DistY(helix.PosPc());
        chargeMip=pClus->Q();
      }//find cluster nearest to the track       
      AliDebug(1,Form("Ploc (%f,%f,%f) dist= %f",helix.Ploc().Mag(),helix.Ploc().Theta()*TMath::RadToDeg(),
                                       helix.Ploc().Phi()*TMath::RadToDeg(),pClus->DistTo(helix.PosPc())));
    }//clusters loop for intersected chamber
    
    AliDebug(1,Form("Min distance cluster: %i dist is %f",iMipId,distMip));
//
// HERE CUTS ON GOLD RINGS....
//
    if(distMip>AliRICHParam::DmatchMIP()||chargeMip<AliRICHParam::QthMIP()) {
      //track not accepted for pattern recognition
      pTrack->SetRICHsignal(-999.); //to be improved by flags...
      return;
    }
//
    AliRICHRecon recon(&helix,pRich->Clusters(iChamber),iMipId); //actual job is done there

    Double_t thetaCerenkov=recon.ThetaCerenkov(); //search for mean Cerenkov angle for this track
    
    pTrack->SetRICHcluster(((Int_t)chargeMip)+1000000*iChamber);
    pTrack->SetRICHdxdy(distX,distY);
    pTrack->SetRICHthetaPhi(helix.Ploc().Theta(),helix.Ploc().Phi());
    pTrack->SetRICHsignal(thetaCerenkov);
    pTrack->SetRICHnclusters(recon.GetHoughPhotons());

    fnPhotBKG = recon.GetPhotBKG();
        
    AliDebug(1,Form("FINAL Theta Cerenkov=%f",pTrack->GetRICHsignal()));
//
    if(pTrack->GetRICHsignal()>0) {
      AliDebug(1,Form("Start to assign the probabilities"));
      Double_t sigmaPID[AliPID::kSPECIES];
      Double_t richPID[AliPID::kSPECIES];
      for (Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++) {
        sigmaPID[iPart] = 0;
        fErrPar[iPart] = 0;
        for(Int_t iphot=0;iphot<pRich->Clusters(iChamber)->GetEntries();iphot++) {
          recon.SetPhotonIndex(iphot);
          if(recon.GetPhotonFlag() == 2) {
            Double_t theta_g=recon.GetTrackTheta();
            Double_t phi_g=(recon.GetPhiPoint()-recon.GetTrackPhi());
            Double_t sigma = AliRICHParam::SigmaSinglePhoton(iPart,pTrack->GetP(),theta_g,phi_g).Mag(); 
            sigmaPID[iPart] += 1/(sigma*sigma);
          }
        }
	if (sigmaPID[iPart]>0)
          sigmaPID[iPart] *= (Double_t)(recon.GetHoughPhotons()-fnPhotBKG)/(Double_t)(recon.GetHoughPhotons()); // n total phots, m are background...the sigma are scaled..
	  sigmaPID[iPart] = 1/TMath::Sqrt(sigmaPID[iPart])*0.001; // sigma from parametrization are in mrad...
          fErrPar[iPart]=sigmaPID[iPart];
        AliDebug(1,Form("sigma for %s is %f rad",AliPID::ParticleName(iPart),sigmaPID[iPart]));
      }
      CalcProb(thetaCerenkov,pTrack->GetP(),sigmaPID,richPID);
      pTrack->SetRICHpid(richPID);         
      AliDebug(1,Form("PROBABILITIES ---> %f - %f - %f - %f - %f",richPID[0],richPID[1],richPID[2],richPID[3],richPID[4]));
    }    
  AliDebug(1,"Stop.");  
} //RecWithESD
//__________________________________________________________________________________________________
void AliRICHTracker::RecWithStack(TNtupleD *hn)
{
//Reconstruction for particles from STACK. This methode is to be used for RICH standalone when no other detectors are switched on,
//so normal tracking is not available   
  AliDebug(1,"Start.");  
  AliRICH *pRich=((AliRICH*)gAlice->GetDetector("RICH"));
  
//  pRich->GetLoader()->GetRunLoader()->LoadHeader();
  if(!pRich->GetLoader()->GetRunLoader()->TreeK()) pRich->GetLoader()->GetRunLoader()->LoadKinematics();
  AliStack *pStack =   pRich->GetLoader()->GetRunLoader()->Stack();
  if(!pStack) {AliDebug(1,Form("No STACK found in AliRoot"));return;}
  Int_t iNtracks=pStack->GetNtrack();
  AliDebug(1,Form(" Start reconstruction with %i track(s) from Stack",iNtracks));
  
  Double_t hnvec[20];
  
  Double_t b=GetFieldMap()->SolenoidField()/10;// magnetic field in Tesla
  AliDebug(1,Form("Start with simulated %i tracks in %f Tesla field",iNtracks,b));
  TVector3 x0(0,0,0); TVector3 p0(0,0,0);//tmp storage for AliRICHHelix
  

  if(pRich->GetLoader()->LoadRecPoints()) {AliDebug(1,Form("No clusters found in RICH"));return;}
  pRich->GetLoader()->TreeR()->GetEntry(0);

  for(Int_t iTrackN=0;iTrackN<iNtracks;iTrackN++){//stack particles loop
    TParticle *pParticle = pStack->Particle(iTrackN);
    if(!pParticle) {AliDebug(1,Form("Not a valid TParticle pointer. Track skipped"));continue;}
    AliDebug(1,Form(" PDG code : %i",pParticle->GetPdgCode()));
//
// problem of PDG code of some extra particles to be solved!!!!!!!!!
//
// found problem! Look in TRD directory : codes from Fluka are :
//
//    if ((pdg_code == 10010020) ||
//        (pdg_code == 10010030) ||
//        (pdg_code == 50000050) ||
//        (pdg_code == 50000051) ||
//        (pdg_code == 10020040)) {
//
    if(pParticle->GetPdgCode()>=50000050||pParticle->GetPdgCode()==0||pParticle->GetPdgCode()>10000) {AliDebug(1,Form("A photon as track... Track skipped"));continue;}
//
// to be updated for us!!
//
    AliDebug(1,Form("Track %i is a %s with charge %i and momentum %f",
            iTrackN,pParticle->GetPDG()->GetName(),Int_t(pParticle->GetPDG()->Charge()),pParticle->P()));
//    if(pParticle->GetMother(0)!=-1) continue; //consider only primaries
    if(pParticle->GetPDG()->Charge()==0||TMath::Abs(Int_t(pParticle->GetPDG()->Charge()))!=3) continue; //to avoid photons from stack...
    hnvec[0]=pParticle->P();
    hnvec[1]=pParticle->GetPDG()->Charge();
    p0.SetMagThetaPhi(pParticle->P(),pParticle->Theta(),pParticle->Phi());
    x0.SetXYZ(pParticle->Vx(),pParticle->Vy(),pParticle->Vz());
    AliRICHHelix helix(x0,p0,TMath::Sign(1,(Int_t)pParticle->GetPDG()->Charge()),b);   
    Int_t iChamber=helix.RichIntersect(pRich->P());        
    hnvec[2]=helix.Ploc().Theta();
    hnvec[3]=helix.Ploc().Phi();
    AliDebug(1,Form("intersection with %i chamber found",iChamber));
    if(!iChamber) continue;// no intersection with RICH found
    hnvec[4]=helix.PosPc().X();
    hnvec[5]=helix.PosPc().Y();
    Double_t distMip=9999;   //min distance between clusters and track position on PC 
    Double_t mipX=-1;      //min distance between clusters and track position on PC 
    Double_t mipY=-1;      //min distance between clusters and track position on PC 
    Double_t chargeMip=-1; // charge MIP to find
    Int_t iMipId=-1;       //index of that min distance cluster 
    for(Int_t iClusN=0;iClusN<pRich->Clusters(iChamber)->GetEntries();iClusN++){//clusters loop for intersected chamber
      AliRICHCluster *pClus=(AliRICHCluster*)pRich->Clusters(iChamber)->UncheckedAt(iClusN);//get pointer to current cluster
      Double_t distCurrent=pClus->DistTo(helix.PosPc());//ditance between current cluster and helix intersection with PC
      if(distCurrent<distMip){distMip=distCurrent;mipX=pClus->X();
                                                  mipY=pClus->Y();
                                                  chargeMip=pClus->Q();iMipId=1000000*iChamber+iClusN;}//find cluster nearest to the track 
      
      AliDebug(1,Form("Ploc (%f,%f,%f) dist= %f",helix.Ploc().Mag(),helix.Ploc().Theta()*TMath::RadToDeg(),
                                                                    helix.Ploc().Phi()*TMath::RadToDeg(),pClus->DistTo(helix.PosPc())));
    }//clusters loop for intersected chamber
    
    AliDebug(1,Form("Min distance cluster: %i dist is %f",iMipId,distMip));
    hnvec[6]=mipX;hnvec[7]=mipY;
    hnvec[8]=chargeMip;
    AliRICHRecon recon(&helix,pRich->Clusters(iChamber),iMipId);
    Double_t thetaCerenkov=recon.ThetaCerenkov(); //search for mean Cerenkov angle for this track
    hnvec[9]=thetaCerenkov;
    hnvec[10]=recon.GetHoughPhotons();
    hnvec[11]=(Double_t)iMipId;
    hnvec[12]=(Double_t)iChamber;
    hnvec[13]=(Double_t)pParticle->GetPdgCode();
    if(hn) hn->Fill(hnvec);
    AliDebug(1,Form("FINAL Theta Cerenkov=%f",thetaCerenkov));
  }//stack particles loop
  
  pRich->GetLoader()->UnloadRecPoints();
  AliDebug(1,"Stop.");  
}//RecWithStack
//__________________________________________________________________________________________________
Int_t AliRICHTracker::LoadClusters(TTree *pTree)
{
// Load clusters for RICH
  AliDebug(1,"Start.");  pTree->GetEntry(0);  AliDebug(1,"Stop."); return 0;
}
//__________________________________________________________________________________________________
void AliRICHTracker::CalcProb(Double_t thetaCer,Double_t pmod, Double_t *sigmaPID, Double_t *richPID)
{
// Calculates probability to be a electron-muon-pion-kaon-proton
// from the given Cerenkov angle and momentum assuming no initial particle composition
// (i.e. apriory probability to be the particle of the given sort is the same for all sorts)
  Double_t height[AliPID::kSPECIES];Double_t totalHeight=0;
  Double_t thetaTh[AliPID::kSPECIES];
  for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++){
    height[iPart]=0;
    Double_t mass = AliRICHParam::fgMass[iPart];
    Double_t refIndex=AliRICHParam::RefIdxC6F14(AliRICHParam::MeanCkovEnergy());
    Double_t cosThetaTh = TMath::Sqrt(mass*mass+pmod*pmod)/(refIndex*pmod);
    thetaTh[iPart]=0;
    if(cosThetaTh>=1) continue;
    thetaTh[iPart] = TMath::ACos(cosThetaTh);
//    Double_t sinThetaThNorm = TMath::Sin(thetaTh)/TMath::Sqrt(1-1/(refIndex*refIndex));
//    Double_t sigmaThetaTh = (0.014*(1/sinThetaThNorm-1) + 0.0043)*1.25;
//    height[iPart] = TMath::Gaus(thetaCer,thetaTh,sigmaThetaTh);
    height[iPart] = TMath::Gaus(thetaCer,thetaTh[iPart],sigmaPID[iPart],kTRUE);
    totalHeight +=height[iPart];
    AliDebug(1,Form(" Particle %s with mass %f with height %f and thetaTH %f",AliPID::ParticleName(iPart),mass,height[iPart],thetaTh[iPart]));
    AliDebug(1,Form(" partial height %15.14f total height %15.14f",height[iPart],totalHeight));
  }
  if(totalHeight<1e-5) {for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++)richPID[iPart]=1.0/AliPID::kSPECIES;return;}
  for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++) richPID[iPart] = height[iPart]/totalHeight;
  Int_t iPartNear = TMath::LocMax(AliPID::kSPECIES,richPID);
  if(TMath::Abs(thetaCer-thetaTh[iPartNear])/sigmaPID[iPartNear]>5) for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++)richPID[iPart]=1.0/AliPID::kSPECIES;
  //last line is to check if the nearest thetacerenkov to the teorethical one is within 5 sigma, otherwise no response (equal prob to every particle

}//CalcProb
//__________________________________________________________________________________________________
Commit	Line	Data
998b831f	1	#include "AliRICHTracker.h"
	2	#include <AliESD.h>
	3	#include <TVector3.h>
	4	#include <TTree.h>
	5	#include "AliRICH.h"
	6	#include "AliRICHHelix.h"
	7	#include <AliMagF.h>
	8	#include "AliRICHRecon.h"
	9	#include <AliStack.h>
	10	#include <TParticle.h>
30c60010	11	#include <TMath.h>
0fe8fa07	12	#include <AliRun.h>
998b831f	13	ClassImp(AliRICHTracker)
30c60010	14	//__________________________________________________________________________________________________
998b831f	15	Int_t AliRICHTracker::PropagateBack(AliESD *pESD)
998b831f	16	{
a25b3368	17	// Interface callback methode invoked by AliRecontruction during tracking after TOF
	18	// It steers to different way to provide the final reconstructed information sutable for analisys:
	19	// 1. AliESD - reconstructed tracks are used
	20	// 2. RICH private ntuple for debug- stack particles used instead of reconstructed tracks
30c60010	21	AliDebug(1,"Start pattern recognition");
910735ae	22	if(pESD->GetNumberOfTracks()) {
	23	Int_t iNtracks=pESD->GetNumberOfTracks();
	24	AliDebug(1,Form("Start with %i tracks",iNtracks));
	25	AliRICH pRich=((AliRICH)gAlice->GetDetector("RICH"));
	26	for(Int_t iTrackN=0;iTrackN<iNtracks;iTrackN++){//ESD tracks loop
	27	RecWithESD(pESD,pRich,iTrackN);
	28	}
	29	}
	30	else RecWithStack(0);
30c60010	31	AliDebug(1,"Stop pattern recognition");
30c60010	32	return 0; // error code: 0=no error;
a25b3368	33	}//PropagateBack()
30c60010	34	//__________________________________________________________________________________________________
910735ae	35	void AliRICHTracker::RecWithESD(AliESD pESD,AliRICH pRich,Int_t iTrackN)
30c60010	36	{
d3eb6079	37	//recontruction from ESD- primary way to reconstruct particle ID signal from tracks provided by core detectors
fab9e039	38	fnPhotBKG = 0;
d3eb6079	39
910735ae	40	Double_t fField=GetFieldMap()->SolenoidField()/10;// magnetic field in Tesla
998b831f	41	AliESDtrack *pTrack = pESD->GetTrack(iTrackN);// get next reconstructed track
998b831f	42	// if((pTrack->GetStatus()&AliESDtrack::kTOFout)==0) continue; //ignore tracks not recontructed by TOF
d3eb6079	43	// pTrack->GetXYZ(xb);
d3eb6079	44	// pTrack->GetPxPyPz(pb);
1cb5a97c	45	Int_t status=pTrack->GetStatus()&AliESDtrack::kTOFout;//get running track parameters
910735ae	46	Int_t charge = (Int_t)(-TMath::Sign(1.,pTrack->GetSign()*fField));
39853df5	47	AliDebug(1,Form("Track %i pmod=%f charge=%i stat=%i",iTrackN,pTrack->GetP(),charge,status));
910735ae	48	AliRICHHelix helix(pTrack->X3(),pTrack->P3(),charge,fField);
998b831f	49	Int_t iChamber=helix.RichIntersect(pRich->P());
998b831f	50	AliDebug(1,Form("intersection with %i chamber found",iChamber));
910735ae	51	if(!iChamber) return;//intersection with no chamber found
0fe8fa07	52	//find MIP cluster candidate (cluster which is closest to track intersection point)
d3eb6079	53	Double_t distMip=9999,distX=0,distY=0; //min distance between clusters and track position on PC
f770edb5	54	Int_t iMipId=0; //index of that min distance cluster
f770edb5	55	Double_t chargeMip=0; //charge of the MIP
998b831f	56	for(Int_t iClusN=0;iClusN<pRich->Clusters(iChamber)->GetEntries();iClusN++){//clusters loop for intersected chamber
0fe8fa07	57	AliRICHCluster pClus=(AliRICHCluster)pRich->Clusters(iChamber)->UncheckedAt(iClusN);//get pointer to current cluster
d3eb6079	58	Double_t distCurrent=pClus->DistTo(helix.PosPc());//distance between current cluster and helix intersection with PC
a25b3368	59	if(distCurrent<distMip){
	60	distMip=distCurrent;
	61	iMipId=iClusN;
d3eb6079	62	distX=pClus->DistX(helix.PosPc());
d3eb6079	63	distY=pClus->DistY(helix.PosPc());
f770edb5	64	chargeMip=pClus->Q();
a25b3368	65	}//find cluster nearest to the track
998b831f	66	AliDebug(1,Form("Ploc (%f,%f,%f) dist= %f",helix.Ploc().Mag(),helix.Ploc().Theta()*TMath::RadToDeg(),
a25b3368	67	helix.Ploc().Phi()*TMath::RadToDeg(),pClus->DistTo(helix.PosPc())));
a25b3368	68	}//clusters loop for intersected chamber
998b831f	69
998b831f	70	AliDebug(1,Form("Min distance cluster: %i dist is %f",iMipId,distMip));
f770edb5	71	//
	72	// HERE CUTS ON GOLD RINGS....
	73	//
fab9e039	74	if(distMip>AliRICHParam::DmatchMIP()\|\|chargeMip<AliRICHParam::QthMIP()) {
f770edb5	75	//track not accepted for pattern recognition
f770edb5	76	pTrack->SetRICHsignal(-999.); //to be improved by flags...
910735ae	77	return;
f770edb5	78	}
f770edb5	79	//
d3eb6079	80	AliRICHRecon recon(&helix,pRich->Clusters(iChamber),iMipId); //actual job is done there
101624cd	81
101624cd	82	Double_t thetaCerenkov=recon.ThetaCerenkov(); //search for mean Cerenkov angle for this track
d3eb6079	83
910735ae	84	pTrack->SetRICHcluster(((Int_t)chargeMip)+1000000*iChamber);
d3eb6079	85	pTrack->SetRICHdxdy(distX,distY);
d3eb6079	86	pTrack->SetRICHthetaPhi(helix.Ploc().Theta(),helix.Ploc().Phi());
101624cd	87	pTrack->SetRICHsignal(thetaCerenkov);
d3eb6079	88	pTrack->SetRICHnclusters(recon.GetHoughPhotons());
fab9e039	89
	90	fnPhotBKG = recon.GetPhotBKG();
	91
d3eb6079	92	AliDebug(1,Form("FINAL Theta Cerenkov=%f",pTrack->GetRICHsignal()));
101624cd	93	//
	94	if(pTrack->GetRICHsignal()>0) {
	95	AliDebug(1,Form("Start to assign the probabilities"));
	96	Double_t sigmaPID[AliPID::kSPECIES];
	97	Double_t richPID[AliPID::kSPECIES];
	98	for (Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++) {
	99	sigmaPID[iPart] = 0;
068217e3	100	fErrPar[iPart] = 0;
101624cd	101	for(Int_t iphot=0;iphot<pRich->Clusters(iChamber)->GetEntries();iphot++) {
	102	recon.SetPhotonIndex(iphot);
	103	if(recon.GetPhotonFlag() == 2) {
fab9e039	104	Double_t theta_g=recon.GetTrackTheta();
	105	Double_t phi_g=(recon.GetPhiPoint()-recon.GetTrackPhi());
	106	Double_t sigma = AliRICHParam::SigmaSinglePhoton(iPart,pTrack->GetP(),theta_g,phi_g).Mag();
910735ae	107	sigmaPID[iPart] += 1/(sigma*sigma);
101624cd	108	}
101624cd	109	}
d1be0d8a	110	if (sigmaPID[iPart]>0)
fab9e039	111	sigmaPID[iPart] *= (Double_t)(recon.GetHoughPhotons()-fnPhotBKG)/(Double_t)(recon.GetHoughPhotons()); // n total phots, m are background...the sigma are scaled..
fab9e039	112	sigmaPID[iPart] = 1/TMath::Sqrt(sigmaPID[iPart])*0.001; // sigma from parametrization are in mrad...
068217e3	113	fErrPar[iPart]=sigmaPID[iPart];
101624cd	114	AliDebug(1,Form("sigma for %s is %f rad",AliPID::ParticleName(iPart),sigmaPID[iPart]));
	115	}
	116	CalcProb(thetaCerenkov,pTrack->GetP(),sigmaPID,richPID);
	117	pTrack->SetRICHpid(richPID);
	118	AliDebug(1,Form("PROBABILITIES ---> %f - %f - %f - %f - %f",richPID[0],richPID[1],richPID[2],richPID[3],richPID[4]));
910735ae	119	}
998b831f	120	AliDebug(1,"Stop.");
30c60010	121	} //RecWithESD
30c60010	122	//__________________________________________________________________________________________________
1cb5a97c	123	void AliRICHTracker::RecWithStack(TNtupleD *hn)
30c60010	124	{
d3eb6079	125	//Reconstruction for particles from STACK. This methode is to be used for RICH standalone when no other detectors are switched on,
	126	//so normal tracking is not available
	127	AliDebug(1,"Start.");
30c60010	128	AliRICH pRich=((AliRICH)gAlice->GetDetector("RICH"));
30c60010	129
1cb5a97c	130	// pRich->GetLoader()->GetRunLoader()->LoadHeader();
d3eb6079	131	if(!pRich->GetLoader()->GetRunLoader()->TreeK()) pRich->GetLoader()->GetRunLoader()->LoadKinematics();
30c60010	132	AliStack *pStack = pRich->GetLoader()->GetRunLoader()->Stack();
39853df5	133	if(!pStack) {AliDebug(1,Form("No STACK found in AliRoot"));return;}
30c60010	134	Int_t iNtracks=pStack->GetNtrack();
1cb5a97c	135	AliDebug(1,Form(" Start reconstruction with %i track(s) from Stack",iNtracks));
1cb5a97c	136
ab92fbe6	137	Double_t hnvec[20];
1cb5a97c	138
30c60010	139	Double_t b=GetFieldMap()->SolenoidField()/10;// magnetic field in Tesla
	140	AliDebug(1,Form("Start with simulated %i tracks in %f Tesla field",iNtracks,b));
	141	TVector3 x0(0,0,0); TVector3 p0(0,0,0);//tmp storage for AliRICHHelix
	142
	143
1cb5a97c	144	if(pRich->GetLoader()->LoadRecPoints()) {AliDebug(1,Form("No clusters found in RICH"));return;}
	145	pRich->GetLoader()->TreeR()->GetEntry(0);
	146
a25b3368	147	for(Int_t iTrackN=0;iTrackN<iNtracks;iTrackN++){//stack particles loop
30c60010	148	TParticle *pParticle = pStack->Particle(iTrackN);
39853df5	149	if(!pParticle) {AliDebug(1,Form("Not a valid TParticle pointer. Track skipped"));continue;}
39853df5	150	AliDebug(1,Form(" PDG code : %i",pParticle->GetPdgCode()));
ab92fbe6	151	//
	152	// problem of PDG code of some extra particles to be solved!!!!!!!!!
	153	//
	154	// found problem! Look in TRD directory : codes from Fluka are :
	155	//
	156	// if ((pdg_code == 10010020) \|\|
	157	// (pdg_code == 10010030) \|\|
	158	// (pdg_code == 50000050) \|\|
	159	// (pdg_code == 50000051) \|\|
	160	// (pdg_code == 10020040)) {
	161	//
	162	if(pParticle->GetPdgCode()>=50000050\|\|pParticle->GetPdgCode()==0\|\|pParticle->GetPdgCode()>10000) {AliDebug(1,Form("A photon as track... Track skipped"));continue;}
	163	//
	164	// to be updated for us!!
	165	//
9f873529	166	AliDebug(1,Form("Track %i is a %s with charge %i and momentum %f",
	167	iTrackN,pParticle->GetPDG()->GetName(),Int_t(pParticle->GetPDG()->Charge()),pParticle->P()));
	168	// if(pParticle->GetMother(0)!=-1) continue; //consider only primaries
	169	if(pParticle->GetPDG()->Charge()==0\|\|TMath::Abs(Int_t(pParticle->GetPDG()->Charge()))!=3) continue; //to avoid photons from stack...
1cb5a97c	170	hnvec[0]=pParticle->P();
1cb5a97c	171	hnvec[1]=pParticle->GetPDG()->Charge();
30c60010	172	p0.SetMagThetaPhi(pParticle->P(),pParticle->Theta(),pParticle->Phi());
30c60010	173	x0.SetXYZ(pParticle->Vx(),pParticle->Vy(),pParticle->Vz());
9f873529	174	AliRICHHelix helix(x0,p0,TMath::Sign(1,(Int_t)pParticle->GetPDG()->Charge()),b);
30c60010	175	Int_t iChamber=helix.RichIntersect(pRich->P());
ef210ba6	176	hnvec[2]=helix.Ploc().Theta();
ef210ba6	177	hnvec[3]=helix.Ploc().Phi();
30c60010	178	AliDebug(1,Form("intersection with %i chamber found",iChamber));
1cb5a97c	179	if(!iChamber) continue;// no intersection with RICH found
	180	hnvec[4]=helix.PosPc().X();
	181	hnvec[5]=helix.PosPc().Y();
	182	Double_t distMip=9999; //min distance between clusters and track position on PC
0fe8fa07	183	Double_t mipX=-1; //min distance between clusters and track position on PC
	184	Double_t mipY=-1; //min distance between clusters and track position on PC
	185	Double_t chargeMip=-1; // charge MIP to find
	186	Int_t iMipId=-1; //index of that min distance cluster
30c60010	187	for(Int_t iClusN=0;iClusN<pRich->Clusters(iChamber)->GetEntries();iClusN++){//clusters loop for intersected chamber
0fe8fa07	188	AliRICHCluster pClus=(AliRICHCluster)pRich->Clusters(iChamber)->UncheckedAt(iClusN);//get pointer to current cluster
30c60010	189	Double_t distCurrent=pClus->DistTo(helix.PosPc());//ditance between current cluster and helix intersection with PC
1cb5a97c	190	if(distCurrent<distMip){distMip=distCurrent;mipX=pClus->X();
	191	mipY=pClus->Y();
	192	chargeMip=pClus->Q();iMipId=1000000*iChamber+iClusN;}//find cluster nearest to the track
30c60010	193
	194	AliDebug(1,Form("Ploc (%f,%f,%f) dist= %f",helix.Ploc().Mag(),helix.Ploc().Theta()*TMath::RadToDeg(),
	195	helix.Ploc().Phi()*TMath::RadToDeg(),pClus->DistTo(helix.PosPc())));
a25b3368	196	}//clusters loop for intersected chamber
30c60010	197
30c60010	198	AliDebug(1,Form("Min distance cluster: %i dist is %f",iMipId,distMip));
1cb5a97c	199	hnvec[6]=mipX;hnvec[7]=mipY;
1cb5a97c	200	hnvec[8]=chargeMip;
30c60010	201	AliRICHRecon recon(&helix,pRich->Clusters(iChamber),iMipId);
30c60010	202	Double_t thetaCerenkov=recon.ThetaCerenkov(); //search for mean Cerenkov angle for this track
1cb5a97c	203	hnvec[9]=thetaCerenkov;
	204	hnvec[10]=recon.GetHoughPhotons();
	205	hnvec[11]=(Double_t)iMipId;
ab92fbe6	206	hnvec[12]=(Double_t)iChamber;
ab92fbe6	207	hnvec[13]=(Double_t)pParticle->GetPdgCode();
1cb5a97c	208	if(hn) hn->Fill(hnvec);
30c60010	209	AliDebug(1,Form("FINAL Theta Cerenkov=%f",thetaCerenkov));
a25b3368	210	}//stack particles loop
1cb5a97c	211
39853df5	212	pRich->GetLoader()->UnloadRecPoints();
30c60010	213	AliDebug(1,"Stop.");
a25b3368	214	}//RecWithStack
a25b3368	215	//__________________________________________________________________________________________________
998b831f	216	Int_t AliRICHTracker::LoadClusters(TTree *pTree)
	217	{
	218	// Load clusters for RICH
	219	AliDebug(1,"Start."); pTree->GetEntry(0); AliDebug(1,"Stop."); return 0;
	220	}
30c60010	221	//__________________________________________________________________________________________________
101624cd	222	void AliRICHTracker::CalcProb(Double_t thetaCer,Double_t pmod, Double_t sigmaPID, Double_t richPID)
30c60010	223	{
12b0e5f4	224	// Calculates probability to be a electron-muon-pion-kaon-proton
a25b3368	225	// from the given Cerenkov angle and momentum assuming no initial particle composition
12b0e5f4	226	// (i.e. apriory probability to be the particle of the given sort is the same for all sorts)
304864ab	227	Double_t height[AliPID::kSPECIES];Double_t totalHeight=0;
101624cd	228	Double_t thetaTh[AliPID::kSPECIES];
304864ab	229	for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++){
101624cd	230	height[iPart]=0;
068217e3	231	Double_t mass = AliRICHParam::fgMass[iPart];
101624cd	232	Double_t refIndex=AliRICHParam::RefIdxC6F14(AliRICHParam::MeanCkovEnergy());
30c60010	233	Double_t cosThetaTh = TMath::Sqrt(massmass+pmodpmod)/(refIndex*pmod);
101624cd	234	thetaTh[iPart]=0;
	235	if(cosThetaTh>=1) continue;
	236	thetaTh[iPart] = TMath::ACos(cosThetaTh);
	237	// Double_t sinThetaThNorm = TMath::Sin(thetaTh)/TMath::Sqrt(1-1/(refIndex*refIndex));
	238	// Double_t sigmaThetaTh = (0.014(1/sinThetaThNorm-1) + 0.0043)1.25;
	239	// height[iPart] = TMath::Gaus(thetaCer,thetaTh,sigmaThetaTh);
	240	height[iPart] = TMath::Gaus(thetaCer,thetaTh[iPart],sigmaPID[iPart],kTRUE);
30c60010	241	totalHeight +=height[iPart];
101624cd	242	AliDebug(1,Form(" Particle %s with mass %f with height %f and thetaTH %f",AliPID::ParticleName(iPart),mass,height[iPart],thetaTh[iPart]));
12b0e5f4	243	AliDebug(1,Form(" partial height %15.14f total height %15.14f",height[iPart],totalHeight));
30c60010	244	}
12b0e5f4	245	if(totalHeight<1e-5) {for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++)richPID[iPart]=1.0/AliPID::kSPECIES;return;}
101624cd	246	for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++) richPID[iPart] = height[iPart]/totalHeight;
101624cd	247	Int_t iPartNear = TMath::LocMax(AliPID::kSPECIES,richPID);
07625543	248	if(TMath::Abs(thetaCer-thetaTh[iPartNear])/sigmaPID[iPartNear]>5) for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++)richPID[iPart]=1.0/AliPID::kSPECIES;
07625543	249	//last line is to check if the nearest thetacerenkov to the teorethical one is within 5 sigma, otherwise no response (equal prob to every particle
101624cd	250
30c60010	251	}//CalcProb
a25b3368	252	//__________________________________________________________________________________________________