// for single chamber //
//////////////////////////////////////////////////////////////////////////
-#include "AliHMPIDRecon.h" //class header
+#include "AliHMPIDRecon.h" //class header
+#include "AliHMPIDParam.h" //CkovAngle()
#include "AliHMPIDCluster.h" //CkovAngle()
-#include <TRotation.h> //TracePhoton()
-#include <TH1D.h> //HoughResponse()
-#include <TClonesArray.h> //CkovAngle()
-#include <AliESDtrack.h> //CkovAngle()
+#include <TMinuit.h> //FitEllipse()
+#include <TRotation.h> //TracePhot()
+#include <TH1D.h> //HoughResponse()
+#include <TClonesArray.h> //CkovAngle()
+#include <AliESDtrack.h> //CkovAngle()
const Double_t AliHMPIDRecon::fgkRadThick=1.5;
const Double_t AliHMPIDRecon::fgkWinThick=0.5;
const Double_t AliHMPIDRecon::fgkGapThick=8.0;
-const Double_t AliHMPIDRecon::fgkRadIdx =1.292;
const Double_t AliHMPIDRecon::fgkWinIdx =1.5787;
const Double_t AliHMPIDRecon::fgkGapIdx =1.0005;
-
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AliHMPIDRecon::AliHMPIDRecon():TTask("RichRec","RichPat"),
+ fRadNmean(1.292),
fPhotCnt(-1),
fCkovSigma2(0),
fIsWEIGHT(kFALSE),
fPhotPhi [i] = -1;
fPhotWei [i] = 0;
}
+//hidden algorithm
+ fMipX=fMipY=fThTrkFit=fPhTrkFit=fCkovFit=fMipQ=fRadX=fRadY=-999;
+ fIdxMip=fNClu=0;
+ fCkovSig2=0;
+ for (Int_t i=0; i<100; i++) {
+ fXClu[i] = fYClu[i] = 0;
+ fClCk[i] = kTRUE;
+ }
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-void AliHMPIDRecon::CkovAngle(AliESDtrack *pTrk,TClonesArray *pCluLst)
+void AliHMPIDRecon::CkovAngle(AliESDtrack *pTrk,TClonesArray *pCluLst,Double_t nmean,Double_t qthre)
{
// Pattern recognition method based on Hough transform
// Arguments: pTrk - track for which Ckov angle is to be found
// pCluLst - list of clusters for this chamber
// Returns: - track ckov angle, [rad],
+
+ AliHMPIDParam *pParam=AliHMPIDParam::Instance();
- if(pCluLst->GetEntries()>200) fIsWEIGHT = kTRUE; // offset to take into account bkg in reconstruction
- else fIsWEIGHT = kFALSE;
+ if(pCluLst->GetEntries()>pParam->MultCut()) fIsWEIGHT = kTRUE; // offset to take into account bkg in reconstruction
+ else fIsWEIGHT = kFALSE;
- // Photon Flag: Flag = 0 initial set; Flag = 1 good candidate (charge compatible with photon); Flag = 2 photon used for the ring;
- Float_t xPc,yPc,th,ph; pTrk->GetHMPIDtrk(xPc,yPc,th,ph); SetTrack(xPc,yPc,th,ph); //initialize this track
+ Float_t xRa,yRa,th,ph;
+ pTrk->GetHMPIDtrk(xRa,yRa,th,ph); //initialize this track: th and ph angles at middle of RAD
+ SetTrack(xRa,yRa,th,ph);
+
+ fRadNmean=nmean;
-
-
Float_t dMin=999,mipX=-1,mipY=-1;Int_t chId=-1,mipId=-1,mipQ=-1;
fPhotCnt=0;
for (Int_t iClu=0; iClu<pCluLst->GetEntriesFast();iClu++){//clusters loop
AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluLst->UncheckedAt(iClu); //get pointer to current cluster
chId=pClu->Ch();
- if(pClu->Q()>100){ //charge compartible with MIP clusters
- Float_t dX=xPc-pClu->X(),dY=yPc-pClu->Y(),d =TMath::Sqrt(dX*dX+dY*dY); //distance between current cluster and intersection point
- if( d < dMin) {mipId=iClu; dMin=d;mipX=pClu->X();mipY=pClu->Y();mipQ=(Int_t)pClu->Q();}//current cluster is closer, overwrite data for min cluster
- }else{ //charge compartible with photon cluster
- fPhotCkov[fPhotCnt]=FindPhotCkov(pClu->X(),pClu->Y()); //find ckov angle for this photon candidate
- fPhotCnt++; //increment counter of photon candidates
+ if(pClu->Q()>qthre){ //charge compartible with MIP clusters
+ Float_t dX=fPc.X()-pClu->X(),dY=fPc.Y()-pClu->Y(),d =TMath::Sqrt(dX*dX+dY*dY); //distance between current cluster and intersection point
+ if( d < dMin) {mipId=iClu; dMin=d;mipX=pClu->X();mipY=pClu->Y();mipQ=(Int_t)pClu->Q();} //current cluster is closer, overwrite data for min cluster
+ }else{ //charge compatible with photon cluster
+ Double_t thetaCer,phiCer;
+ if(FindPhotCkov(pClu->X(),pClu->Y(),thetaCer,phiCer)){ //find ckov angle for this photon candidate
+ fPhotCkov[fPhotCnt]=thetaCer; //actual theta Cerenkov (in TRS)
+ fPhotPhi [fPhotCnt]=phiCer; //actual phi Cerenkov (in TRS): -pi to come back to "unusual" ref system (X,Y,-Z)
+ //PH Printf("photon n. %i reconstructed theta = %f",fPhotCnt,fPhotCkov[fPhotCnt]);
+ fPhotCnt++; //increment counter of photon candidates
+ }
}
}//clusters loop
- Int_t iNacc=FlagPhot(HoughResponse()); //flag photons according to individual theta ckov with respect to most probable
-
- pTrk->SetHMPIDmip (mipX,mipY,mipQ,iNacc); //store mip info
+ fMipPos.Set(mipX,mipY);
+ if(fPhotCnt<=3) pTrk->SetHMPIDsignal(kNoPhotAccept); //no reconstruction with <=3 photon candidates
+ Int_t iNacc=FlagPhot(HoughResponse()); //flag photons according to individual theta ckov with respect to most probable
+ pTrk->SetHMPIDmip(mipX,mipY,mipQ,iNacc); //store mip info
- if(mipId==-1) {pTrk->SetHMPIDsignal (kMipQdcCut); return;} //no clusters with QDC more the threshold at all
- if(dMin>1) {pTrk->SetHMPIDsignal (kMipDistCut); return;} //closest cluster with enough charge is still too far from intersection
- pTrk->SetHMPIDcluIdx(chId,mipId);
- if(iNacc<1) pTrk->SetHMPIDsignal(kNoPhotAccept); //no photon candidates is accepted
- else pTrk->SetHMPIDsignal(FindRingCkov(pCluLst->GetEntries())); //find best Theta ckov for ring i.e. track
-
- pTrk->SetHMPIDchi2(fCkovSigma2); //error squared
+ if(mipId==-1) {pTrk->SetHMPIDsignal(kMipQdcCut); return;} //no clusters with QDC more the threshold at all
+ if(dMin>pParam->DistCut()) {pTrk->SetHMPIDsignal(kMipDistCut); return;} //closest cluster with enough charge is still too far from intersection
+ pTrk->SetHMPIDcluIdx(chId,mipId); //set index of cluster
+ if(iNacc<1){
+ pTrk->SetHMPIDsignal(kNoPhotAccept); //no photon candidates is accepted
+ }
+ else {
+ pTrk->SetHMPIDsignal(FindRingCkov(pCluLst->GetEntries())); //find best Theta ckov for ring i.e. track
+ pTrk->SetHMPIDchi2(fCkovSigma2); //errors squared
+ }
-}//ThetaCerenkov()
+}//CkovAngle()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-Double_t AliHMPIDRecon::FindPhotCkov(Double_t cluX,Double_t cluY)
+Bool_t AliHMPIDRecon::FindPhotCkov(Double_t cluX,Double_t cluY,Double_t &thetaCer,Double_t &phiCer)
{
// Finds Cerenkov angle for this photon candidate
// Arguments: cluX,cluY - position of cadidate's cluster
-// Returns: Cerenkov angle
+// Returns: Cerenkov angle
- TVector2 pos(cluX,cluY); Double_t cluR=(pos-fTrkPos).Mod(); Double_t phi=FindPhotPhi(cluX,cluY);
- Double_t ckov1=0,ckov2=0.75;
- const Double_t kTol=0.05;
+ TVector3 dirCkov;
+
+ Double_t zRad= -0.5*fgkRadThick-0.5*fgkWinThick; //z position of middle of RAD
+ TVector3 rad(fTrkPos.X(),fTrkPos.Y(),zRad); //impact point at middle of RAD
+ TVector3 pc(cluX,cluY,0.5*fgkWinThick+fgkGapIdx); //mip at PC
+ Double_t cluR = TMath::Sqrt((cluX-fTrkPos.X())*(cluX-fTrkPos.X())+
+ (cluY-fTrkPos.Y())*(cluY-fTrkPos.Y()));//ref. distance impact RAD-CLUSTER
+ Double_t phi=(pc-rad).Phi(); //phi of photon
+
+ Double_t ckov1=0;
+ Double_t ckov2=0.75+fTrkDir.Theta(); //start to find theta cerenkov in DRS
+ const Double_t kTol=0.01;
Int_t iIterCnt = 0;
while(1){
- if(iIterCnt>=50) return -1;
+ if(iIterCnt>=50) return kFALSE;
Double_t ckov=0.5*(ckov1+ckov2);
- Double_t dist=cluR-TracePhot(ckov,phi,pos); iIterCnt++; //get distance between trial point and cluster position
- if (dist> kTol) ckov1=ckov; //cluster @ larger ckov
+ dirCkov.SetMagThetaPhi(1,ckov,phi);
+ TVector2 posC=TraceForward(dirCkov); //trace photon with actual angles
+ Double_t dist=cluR-(posC-fTrkPos).Mod(); //get distance between trial point and cluster position
+ if(posC.X()==-999) dist = - 999; //total reflection problem
+ iIterCnt++; //counter step
+ if (dist> kTol) ckov1=ckov; //cluster @ larger ckov
else if(dist<-kTol) ckov2=ckov; //cluster @ smaller ckov
- else return ckov; //precision achived
+ else{ //precision achived: ckov in DRS found
+ dirCkov.SetMagThetaPhi(1,ckov,phi); //
+ RecPhot(dirCkov,thetaCer,phiCer); //find ckov (in TRS:the effective Cherenkov angle!)
+ return kTRUE;
+ }
}
}//FindPhotTheta()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-Double_t AliHMPIDRecon::FindPhotPhi(Double_t cluX,Double_t cluY)
+TVector2 AliHMPIDRecon::TraceForward(TVector3 dirCkov)const
{
-// Finds phi angle og photon candidate by considering the cluster's position of this candudate w.r.t track position
-
- Double_t emiss=0;
- return fPhotPhi[fPhotCnt]=TMath::ATan2(cluY-fTrkPos.Y()-emiss*TMath::Tan(fTrkDir.Theta())*TMath::Sin(fTrkDir.Phi()),
- cluX-fTrkPos.X()-emiss*TMath::Tan(fTrkDir.Theta())*TMath::Cos(fTrkDir.Phi()));
+ //Trace forward a photon from (x,y) up to PC
+ // Arguments: dirCkov photon vector in LORS
+ // Returns: pos of traced photon at PC
+ TVector2 pos(-999,-999);
+ Double_t thetaCer = dirCkov.Theta();
+ if(thetaCer > TMath::ASin(1./fRadNmean)) return pos; //total refraction on WIN-GAP boundary
+ Double_t zRad= -0.5*fgkRadThick-0.5*fgkWinThick; //z position of middle of RAD
+ TVector3 posCkov(fTrkPos.X(),fTrkPos.Y(),zRad); //RAD: photon position is track position @ middle of RAD
+ Propagate(dirCkov,posCkov, -0.5*fgkWinThick); //go to RAD-WIN boundary
+ Refract (dirCkov, fRadNmean,fgkWinIdx); //RAD-WIN refraction
+ Propagate(dirCkov,posCkov, 0.5*fgkWinThick); //go to WIN-GAP boundary
+ Refract (dirCkov, fgkWinIdx,fgkGapIdx); //WIN-GAP refraction
+ Propagate(dirCkov,posCkov,0.5*fgkWinThick+fgkGapThick); //go to PC
+ pos.Set(posCkov.X(),posCkov.Y());
+ return pos;
+}//TraceForward()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+void AliHMPIDRecon::RecPhot(TVector3 dirCkov,Double_t &thetaCer,Double_t &phiCer)
+{
+ //Theta Cerenkov reconstruction
+ // Arguments: (x,y) of initial point in LORS, dirCkov photon vector in LORS
+ // Returns: thetaCer theta cerenkov reconstructed
+// TVector3 dirTrk;
+// dirTrk.SetMagThetaPhi(1,fTrkDir.Theta(),fTrkDir.Phi());
+// Double_t thetaCer = TMath::ACos(dirCkov*dirTrk);
+ TRotation mtheta; mtheta.RotateY(- fTrkDir.Theta());
+ TRotation mphi; mphi.RotateZ(- fTrkDir.Phi());
+ TRotation mrot=mtheta*mphi;
+ TVector3 dirCkovTRS;
+ dirCkovTRS=mrot*dirCkov;
+ phiCer = dirCkovTRS.Phi(); //actual value of the phi of the photon
+ thetaCer= dirCkovTRS.Theta(); //actual value of thetaCerenkov of the photon
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Double_t AliHMPIDRecon::FindRingArea(Double_t ckovAng)const
{
-// Find area inside the cerenkov ring which lays inside PCs
-// Arguments: ckovThe - cernkov
+// Find area covered in the PC acceptance
+// Arguments: ckovAng - cerenkov angle
// Returns: area of the ring in cm^2 for given theta ckov
-
- TVector2 pos1,pos2;
-
const Int_t kN=100;
+ TVector2 pos1;
Double_t area=0;
+ Bool_t first=kFALSE;
for(Int_t i=0;i<kN;i++){
- TracePhot(ckovAng,Double_t(TMath::TwoPi()*i /kN),pos1);//trace this photon
- TracePhot(ckovAng,Double_t(TMath::TwoPi()*(i+1)/kN),pos2);//trace this photon
- area+=(pos1-fTrkPos)*(pos2-fTrkPos);
-
+ if(!first) {
+ pos1=TracePhot(ckovAng,Double_t(TMath::TwoPi()*(i+1)/kN)); //find a good trace for the first photon
+ if(pos1.X()==-999) continue; //no area: open ring
+ if(!AliHMPIDParam::IsInside(pos1.X(),pos1.Y(),0)) pos1 = IntWithEdge(fMipPos,pos1); // ffind the very first intersection...
+ first=kTRUE;
+ continue;
+ }
+ TVector2 pos2=TracePhot(ckovAng,Double_t(TMath::TwoPi()*(i+1)/kN)); //trace the next photon
+ if(pos2.X()==-999) continue; //no area: open ring
+ if(!AliHMPIDParam::IsInside(pos2.X(),pos2.Y(),0)) {
+ pos2 = IntWithEdge(fMipPos,pos2);
+ }
+ area+=TMath::Abs((pos1-fMipPos).X()*(pos2-fMipPos).Y()-(pos1-fMipPos).Y()*(pos2-fMipPos).X()); //add area of the triangle...
+ pos1 = pos2;
}
+//--- find points from ring
+ area*=0.5;
return area;
}//FindRingArea()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+TVector2 AliHMPIDRecon::IntWithEdge(TVector2 p1,TVector2 p2)const
+{
+// It finds the intersection of the line for 2 points traced as photons
+// and the edge of a given PC
+// Arguments: 2 points obtained tracing the photons
+// Returns: intersection point with detector (PC) edges
+
+ AliHMPIDParam *pParam = AliHMPIDParam::Instance();
+
+ Double_t xmin = (p1.X()<p2.X())? p1.X():p2.X();
+ Double_t xmax = (p1.X()<p2.X())? p2.X():p1.X();
+ Double_t ymin = (p1.Y()<p2.Y())? p1.Y():p2.Y();
+ Double_t ymax = (p1.Y()<p2.Y())? p2.Y():p1.Y();
+
+ Double_t m = TMath::Tan((p2-p1).Phi());
+ TVector2 pint;
+ //intersection with low X
+ pint.Set((Double_t)(p1.X() + (0-p1.Y())/m),0.);
+ pint.Print();
+ if(pint.X()>=0 && pint.X()<=pParam->SizeAllX() &&
+ pint.X()>=xmin && pint.X()<=xmax &&
+ pint.Y()>=ymin && pint.Y()<=ymax) return pint;
+ //intersection with high X
+ pint.Set((Double_t)(p1.X() + (pParam->SizeAllY()-p1.Y())/m),(Double_t)(pParam->SizeAllY()));
+ pint.Print();
+ if(pint.X()>=0 && pint.X()<=pParam->SizeAllX() &&
+ pint.X()>=xmin && pint.X()<=xmax &&
+ pint.Y()>=ymin && pint.Y()<=ymax) return pint;
+ //intersection with left Y
+ pint.Set(0.,(Double_t)(p1.Y() + m*(0-p1.X())));
+ pint.Print();
+ if(pint.Y()>=0 && pint.Y()<=pParam->SizeAllY() &&
+ pint.Y()>=ymin && pint.Y()<=ymax &&
+ pint.X()>=xmin && pint.X()<=xmax) return pint;
+ //intersection with righ Y
+ pint.Set((Double_t)(pParam->SizeAllX()),(Double_t)(p1.Y() + m*(pParam->SizeAllX()-p1.X())));
+ pint.Print();
+ if(pint.Y()>=0 && pint.Y()<=pParam->SizeAllY() &&
+ pint.Y()>=ymin && pint.Y()<=ymax &&
+ pint.X()>=xmin && pint.X()<=xmax) return pint;
+ return p1;
+}//IntWithEdge()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Double_t AliHMPIDRecon::FindRingCkov(Int_t)
{
// Loops on all Ckov candidates and estimates the best Theta Ckov for a ring formed by those candidates. Also estimates an error for that Theat Ckov
for(Int_t i=0;i<fPhotCnt;i++){//candidates loop
if(fPhotFlag[i] == 2){
- if(fPhotCkov[i]<=0) continue;//?????????????????Flag photos = 2 may imply CkovEta = 0??????????????
- if(fPhotCkov[i]<ckovMin) ckovMin=fPhotCkov[i]; //find max and min Theta ckov from all candidates within probable window
+ if(fPhotCkov[i]<ckovMin) ckovMin=fPhotCkov[i]; //find max and min Theta ckov from all candidates within probable window
if(fPhotCkov[i]>ckovMax) ckovMax=fPhotCkov[i];
- weightThetaCerenkov += fPhotCkov[i]*fPhotWei[i]; wei += fPhotWei[i]; //collect weight as sum of all candidate weghts
+ weightThetaCerenkov += fPhotCkov[i]*fPhotWei[i];
+ wei += fPhotWei[i]; //collect weight as sum of all candidate weghts
sigma2 += 1./Sigma2(fPhotCkov[i],fPhotPhi[i]);
}
if(sigma2>0) fCkovSigma2=1./sigma2;
else fCkovSigma2=1e10;
- if(wei != 0.) weightThetaCerenkov /= wei; else weightThetaCerenkov = 0.;
+ if(wei != 0.) weightThetaCerenkov /= wei; else weightThetaCerenkov = 0.;
return weightThetaCerenkov;
}//FindCkovRing()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Arguments: ckov- value of most probable ckov angle for track as returned by HoughResponse()
// Returns: number of photon candidates happened to be inside the window
+// Photon Flag: Flag = 0 initial set;
+// Flag = 1 good candidate (charge compatible with photon);
+// Flag = 2 photon used for the ring;
Int_t steps = (Int_t)((ckov )/ fDTheta); //how many times we need to have fDTheta to fill the distance between 0 and thetaCkovHough
Int_t iInsideCnt = 0; //count photons which Theta ckov inside the window
for(Int_t i=0;i<fPhotCnt;i++){//photon candidates loop
+ fPhotFlag[i] = 0;
if(fPhotCkov[i] >= tmin && fPhotCkov[i] <= tmax) {
fPhotFlag[i]=2;
iInsideCnt++;
return iInsideCnt;
}//FlagPhot()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-Double_t AliHMPIDRecon::TracePhot(Double_t ckovThe,Double_t ckovPhi,TVector2 &pos)const
+TVector2 AliHMPIDRecon::TracePhot(Double_t ckovThe,Double_t ckovPhi)const
{
// Trace a single Ckov photon from emission point somewhere in radiator up to photocathode taking into account ref indexes of materials it travereses
-// Arguments: ckovThe,ckovPhi- photon ckov angles, [rad] (warning: not photon theta and phi)
+// Arguments: ckovThe,ckovPhi- photon ckov angles in DRS, [rad]
// Returns: distance between photon point on PC and track projection
TRotation mtheta; mtheta.RotateY(fTrkDir.Theta());
TRotation mphi; mphi.RotateZ(fTrkDir.Phi());
TRotation mrot=mphi*mtheta;
-
- TVector3 posCkov(fTrkPos.X(),fTrkPos.Y(),-0.5*fgkRadThick-fgkWinThick-fgkGapThick); //RAD: photon position is track position @ middle of RAD
- TVector3 dirCkov; dirCkov.SetMagThetaPhi(1,ckovThe,ckovPhi); //initially photon is directed according to requested ckov angle
- dirCkov=mrot*dirCkov; //now we know photon direction in LORS
- dirCkov.SetPhi(ckovPhi);
- if(dirCkov.Theta() > TMath::ASin(1./fgkRadIdx)) return -999;//total refraction on WIN-GAP boundary
-
- Propagate(dirCkov,posCkov,-fgkWinThick-fgkGapThick); //go to RAD-WIN boundary remeber that z=0 is PC plane
- Refract (dirCkov, fgkRadIdx,fgkWinIdx ); //RAD-WIN refraction
- Propagate(dirCkov,posCkov,-fgkGapThick ); //go to WIN-GAP boundary
- Refract (dirCkov, fgkWinIdx,fgkGapIdx ); //WIN-GAP refraction
- Propagate(dirCkov,posCkov,0 ); //go to PC
-
- pos.Set(posCkov.X(),posCkov.Y());
- return (pos-fTrkPos).Mod();
-}//TracePhoton()
+ TVector3 dirCkov,dirCkovTors;
+
+ dirCkovTors.SetMagThetaPhi(1,ckovThe,ckovPhi); //initially photon is directed according to requested ckov angle
+ dirCkov=mrot*dirCkovTors; //now we know photon direction in LORS
+ return TraceForward(dirCkov);
+}//TracePhot()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-void AliHMPIDRecon::Propagate(const TVector3 &dir,TVector3 &pos,Double_t z)const
+void AliHMPIDRecon::Propagate(const TVector3 dir,TVector3 &pos,Double_t z)const
{
// Finds an intersection point between a line and XY plane shifted along Z.
// Arguments: dir,pos - vector along the line and any point of the line
// Returns: none
// On exit: dir is new direction
Double_t sinref=(n1/n2)*TMath::Sin(dir.Theta());
- if(sinref>1.) dir.SetXYZ(-999,-999,-999);
+ if(TMath::Abs(sinref)>1.) dir.SetXYZ(-999,-999,-999);
else dir.SetTheta(TMath::ASin(sinref));
}//Refract()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Double_t AliHMPIDRecon::HoughResponse()
{
//
-//
+// fIdxMip = mipId;
+
//
Double_t kThetaMax=0.75;
Int_t nChannels = (Int_t)(kThetaMax/fDTheta+0.5);
Int_t bin = (Int_t)(0.5+angle/(fDTheta));
Double_t weight=1.;
if(fIsWEIGHT){
- Double_t lowerlimit = ((Double_t)bin)*fDTheta - 0.5*fDTheta; Double_t upperlimit = ((Double_t)bin)*fDTheta + 0.5*fDTheta;
+ Double_t lowerlimit = ((Double_t)bin)*fDTheta - 0.5*fDTheta; Double_t upperlimit = ((Double_t)bin)*fDTheta + 0.5*fDTheta;
Double_t diffArea = FindRingArea(upperlimit)-FindRingArea(lowerlimit);
if(diffArea>0) weight = 1./diffArea;
}
// evaluate the "BEST" theta ckov as the maximum value of histogramm
Double_t *pVec = resultw->GetArray();
Int_t locMax = TMath::LocMax(nBin,pVec);
- phots->Delete();photsw->Delete();resultw->Delete(); // Reset and delete objects
+ delete phots;delete photsw;delete resultw; // Reset and delete objects
return (Double_t)(locMax*fDTheta+0.5*fDTheta); //final most probable track theta ckov
}//HoughResponse()
// Returns: absolute error on Cerenkov angle, [radians]
TVector3 v(-999,-999,-999);
- Double_t trkBeta = 1./(TMath::Cos(ckovTh)*fgkRadIdx);
+ Double_t trkBeta = 1./(TMath::Cos(ckovTh)*fRadNmean);
+
+ if(trkBeta > 1) trkBeta = 1; //protection against bad measured thetaCer
+ if(trkBeta < 0) trkBeta = 0.0001; //
v.SetX(SigLoc (ckovTh,ckovPh,trkBeta));
v.SetY(SigGeom(ckovTh,ckovPh,trkBeta));
// dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
// MIP beta
// Returns: absolute error on Cerenkov angle, [radians]
+
Double_t phiDelta = phiC - fTrkDir.Phi();
- Double_t alpha =TMath::Cos(fTrkDir.Theta())-TMath::Tan(thetaC)*TMath::Cos(phiDelta)*TMath::Sin(fTrkDir.Theta());
- Double_t k = 1.-fgkRadIdx*fgkRadIdx+alpha*alpha/(betaM*betaM);
+ Double_t sint = TMath::Sin(fTrkDir.Theta());
+ Double_t cost = TMath::Cos(fTrkDir.Theta());
+ Double_t sinf = TMath::Sin(fTrkDir.Phi());
+ Double_t cosf = TMath::Cos(fTrkDir.Phi());
+ Double_t sinfd = TMath::Sin(phiDelta);
+ Double_t cosfd = TMath::Cos(phiDelta);
+ Double_t tantheta = TMath::Tan(thetaC);
+
+ Double_t alpha =cost-tantheta*cosfd*sint; // formula (11)
+ Double_t k = 1.-fRadNmean*fRadNmean+alpha*alpha/(betaM*betaM); // formula (after 8 in the text)
if (k<0) return 1e10;
+ Double_t mu =sint*sinf+tantheta*(cost*cosfd*sinf+sinfd*cosf); // formula (10)
+ Double_t e =sint*cosf+tantheta*(cost*cosfd*cosf-sinfd*sinf); // formula (9)
- Double_t mu =TMath::Sin(fTrkDir.Theta())*TMath::Sin(fTrkDir.Phi())+TMath::Tan(thetaC)*(TMath::Cos(fTrkDir.Theta())*TMath::Cos(phiDelta)*TMath::Sin(fTrkDir.Phi())+TMath::Sin(phiDelta)*TMath::Cos(fTrkDir.Phi()));
- Double_t e =TMath::Sin(fTrkDir.Theta())*TMath::Cos(fTrkDir.Phi())+TMath::Tan(thetaC)*(TMath::Cos(fTrkDir.Theta())*TMath::Cos(phiDelta)*TMath::Cos(fTrkDir.Phi())-TMath::Sin(phiDelta)*TMath::Sin(fTrkDir.Phi()));
-
- Double_t kk = betaM*TMath::Sqrt(k)/(8*alpha);
- Double_t dtdxc = kk*(k*(TMath::Cos(phiDelta)*TMath::Cos(fTrkDir.Phi())-TMath::Cos(fTrkDir.Theta())*TMath::Sin(phiDelta)*TMath::Sin(fTrkDir.Phi()))-(alpha*mu/(betaM*betaM))*TMath::Sin(fTrkDir.Theta())*TMath::Sin(phiDelta));
- Double_t dtdyc = kk*(k*(TMath::Cos(phiDelta)*TMath::Sin(fTrkDir.Phi())+TMath::Cos(fTrkDir.Theta())*TMath::Sin(phiDelta)*TMath::Cos(fTrkDir.Phi()))+(alpha* e/(betaM*betaM))*TMath::Sin(fTrkDir.Theta())*TMath::Sin(phiDelta));
+ Double_t kk = betaM*TMath::Sqrt(k)/(fgkGapThick*alpha); // formula (6) and (7)
+ Double_t dtdxc = kk*(k*(cosfd*cosf-cost*sinfd*sinf)-(alpha*mu/(betaM*betaM))*sint*sinfd); // formula (6)
+ Double_t dtdyc = kk*(k*(cosfd*sinf+cost*sinfd*cosf)+(alpha* e/(betaM*betaM))*sint*sinfd); // formula (7) pag.4
- return TMath::Sqrt(0.2*0.2*dtdxc*dtdxc + 0.25*0.25*dtdyc*dtdyc);
+ Double_t errX = 0.2,errY=0.25; //end of page 7
+ return TMath::Sqrt(errX*errX*dtdxc*dtdxc + errY*errY*dtdyc*dtdyc);
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Double_t AliHMPIDRecon::SigCrom(Double_t thetaC, Double_t phiC,Double_t betaM)const
// dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
// MIP beta
// Returns: absolute error on Cerenkov angle, [radians]
+
Double_t phiDelta = phiC - fTrkDir.Phi();
- Double_t alpha =TMath::Cos(fTrkDir.Theta())-TMath::Tan(thetaC)*TMath::Cos(phiDelta)*TMath::Sin(fTrkDir.Theta());
- Double_t dtdn = TMath::Cos(fTrkDir.Theta())*fgkRadIdx*betaM*betaM/(alpha*TMath::Tan(thetaC));
+ Double_t sint = TMath::Sin(fTrkDir.Theta());
+ Double_t cost = TMath::Cos(fTrkDir.Theta());
+ Double_t cosfd = TMath::Cos(phiDelta);
+ Double_t tantheta = TMath::Tan(thetaC);
+
+ Double_t alpha =cost-tantheta*cosfd*sint; // formula (11)
+ Double_t dtdn = cost*fRadNmean*betaM*betaM/(alpha*tantheta); // formula (12)
- Double_t f = 0.00928*(7.75-5.635)/TMath::Sqrt(12.);
+// Double_t f = 0.00928*(7.75-5.635)/TMath::Sqrt(12.);
+ Double_t f = 0.0172*(7.75-5.635)/TMath::Sqrt(24.);
return f*dtdn;
}//SigCrom()
// Returns: absolute error on Cerenkov angle, [radians]
Double_t phiDelta = phiC - fTrkDir.Phi();
- Double_t alpha =TMath::Cos(fTrkDir.Theta())-TMath::Tan(thetaC)*TMath::Cos(phiDelta)*TMath::Sin(fTrkDir.Theta());
- Double_t k = 1.-fgkRadIdx*fgkRadIdx+alpha*alpha/(betaM*betaM);
+ Double_t sint = TMath::Sin(fTrkDir.Theta());
+ Double_t cost = TMath::Cos(fTrkDir.Theta());
+ Double_t sinf = TMath::Sin(fTrkDir.Phi());
+ Double_t cosfd = TMath::Cos(phiDelta);
+ Double_t costheta = TMath::Cos(thetaC);
+ Double_t tantheta = TMath::Tan(thetaC);
+
+ Double_t alpha =cost-tantheta*cosfd*sint; // formula (11)
+
+ Double_t k = 1.-fRadNmean*fRadNmean+alpha*alpha/(betaM*betaM); // formula (after 8 in the text)
if (k<0) return 1e10;
- Double_t eTr = 0.5*1.5*betaM*TMath::Sqrt(k)/(8*alpha);
- Double_t lambda = 1.-TMath::Sin(fTrkDir.Theta())*TMath::Sin(fTrkDir.Theta())*TMath::Sin(phiC)*TMath::Sin(phiC);
-
- Double_t c = 1./(1.+ eTr*k/(alpha*alpha*TMath::Cos(thetaC)*TMath::Cos(thetaC)));
- Double_t i = betaM*TMath::Tan(thetaC)*lambda*TMath::Power(k,1.5);
- Double_t ii = 1.+eTr*betaM*i;
+ Double_t eTr = 0.5*fgkRadThick*betaM*TMath::Sqrt(k)/(fgkGapThick*alpha); // formula (14)
+ Double_t lambda = 1.-sint*sint*sinf*sinf; // formula (15)
- Double_t err = c * (i/(alpha*alpha*8) + ii*(1.-lambda) / ( alpha*alpha*8*betaM*(1.+eTr)) );
- Double_t trErr = 1.5/(TMath::Sqrt(12.)*TMath::Cos(fTrkDir.Theta()));
+ Double_t c1 = 1./(1.+ eTr*k/(alpha*alpha*costheta*costheta)); // formula (13.a)
+ Double_t c2 = betaM*TMath::Power(k,1.5)*tantheta*lambda/(fgkGapThick*alpha*alpha); // formula (13.b)
+ Double_t c3 = (1.+eTr*k*betaM*betaM)/((1+eTr)*alpha*alpha); // formula (13.c)
+ Double_t c4 = TMath::Sqrt(k)*tantheta*(1-lambda)/(fgkGapThick*betaM); // formula (13.d)
+ Double_t dtdT = c1 * (c2+c3*c4);
+ Double_t trErr = fgkRadThick/(TMath::Sqrt(12.)*cost);
- return trErr*err;
+ return trErr*dtdT;
}//SigGeom()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+//
+// From here HTA....
+//
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDRecon::CkovHiddenTrk(AliESDtrack *pTrk,TClonesArray *pCluLst,Double_t nmean, Double_t qthre)
+{
+// Pattern recognition method without any infos from tracking:HTA (Hidden Track Algorithm)...
+// The method finds in the chmber the cluster with the highest charge
+// compatibile with a MIP, then the strategy is applied
+// Arguments: pTrk - pointer to ESD track
+// pCluLs - list of clusters for a given chamber
+// nmean - mean freon ref. index
+// Returns: - 0=ok,1=not fitted
+
+ fRadNmean=nmean;
+
+ if(pCluLst->GetEntriesFast()>100) return kFALSE; //boundary check for CluX,CluY...
+ Float_t mipX=-1,mipY=-1;Int_t mipId=-1,mipQ=-1;
+ Double_t qRef = 0;
+ Int_t nCh=0;
+ for (Int_t iClu=0;iClu<pCluLst->GetEntriesFast();iClu++){ //clusters loop
+ AliHMPIDCluster *pClu=(AliHMPIDCluster*)pCluLst->UncheckedAt(iClu); //get pointer to current cluster
+ nCh = pClu->Ch();
+ fXClu[iClu] = pClu->X();fYClu[iClu] = pClu->Y(); //store x,y for fitting procedure
+ fClCk[iClu] = kTRUE; //all cluster are accepted at this stage to be reconstructed
+ if(pClu->Q()>qRef){ //searching the highest charge to select a MIP
+ qRef = pClu->Q();
+ mipId=iClu; mipX=pClu->X();mipY=pClu->Y();mipQ=(Int_t)pClu->Q();
+ }
+ }//clusters loop
+
+ fNClu = pCluLst->GetEntriesFast();
+ if(qRef>qthre){ //charge compartible with MIP clusters
+ fIdxMip = mipId;
+ fClCk[mipId] = kFALSE;
+ fMipX = mipX; fMipY=mipY; fMipQ = qRef;
+ if(!DoRecHiddenTrk(pCluLst)) {
+ pTrk->SetHMPIDsignal(kNoPhotAccept);
+ return kFALSE;
+ } //Do track and ring reconstruction,if problems returns 1
+ pTrk->SetHMPIDtrk(fRadX,fRadY,fThTrkFit,fPhTrkFit); //store track intersection info
+ pTrk->SetHMPIDmip(fMipX,fMipY,(Int_t)fMipQ,fNClu); //store mip info
+ pTrk->SetHMPIDcluIdx(nCh,fIdxMip); //set cham number and index of cluster
+ pTrk->SetHMPIDsignal(fCkovFit); //find best Theta ckov for ring i.e. track
+ pTrk->SetHMPIDchi2(fCkovSig2); //errors squared
+// Printf(" n clusters tot %i accepted %i",pCluLst->GetEntriesFast(),fNClu);
+ return kTRUE;
+ }
+
+ return kFALSE;
+}//CkovHiddenTrk()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDRecon::DoRecHiddenTrk(TClonesArray *pCluLst)
+{
+// Pattern recognition method without any infos from tracking...
+// First a preclustering filter to avoid part of the noise
+// Then only ellipsed-rings are fitted (no possibility,
+// for the moment, to reconstruct very inclined tracks)
+// Finally a fitting with (th,ph) free, starting by very close values
+// previously evaluated.
+// Arguments: none
+// Returns: none
+ Double_t phiRec;
+ if(!CluPreFilter(pCluLst)) {return kFALSE;}
+ if(!FitEllipse(phiRec)) {return kFALSE;}
+ Int_t nClTmp1 = pCluLst->GetEntriesFast()-1; //minus MIP...
+ Int_t nClTmp2 = 0;
+ while(nClTmp1 != nClTmp2){
+ SetNClu(pCluLst->GetEntriesFast());
+ if(!FitFree(phiRec)) {return kFALSE;}
+ nClTmp2 = NClu();
+ if(nClTmp2!=nClTmp1) {nClTmp1=nClTmp2;nClTmp2=0;}
+ }
+ fNClu = nClTmp2;
+ return kTRUE;
+}//DoRecHiddenTrk()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDRecon::CluPreFilter(TClonesArray *pCluLst)
+{
+// Filter of bkg clusters
+// based on elliptical-shapes...
+//
+ if(pCluLst->GetEntriesFast()>50||pCluLst->GetEntriesFast()<4) return kFALSE;
+ else return kTRUE;
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDRecon::FitEllipse(Double_t &phiRec)
+{
+//Fit a set of clusters with an analitical conical section function:
+ //
+ // Ax^2 + B*y^2 + 2Hxy + 2Gx + 2Fy + 1 = 0 ---> conical section
+ //
+ // H*H - A*B > 0 hyperbola
+ // < 0 ellipse
+ // = 0 parabola
+ //
+ // tan 2alfa = 2H/(A-B) alfa=angle of rotation
+ //
+ // coordinate of the centre of the conical section:
+ // x = x' + a
+ // y = y' + b
+ //
+ // HF - BG
+ // a = ---------
+ // AB - H^2
+ //
+ // HG - AF
+ // b = --------
+ // AB - H^2
+ Double_t cA,cB,cF,cG,cH;
+ Double_t aArg=-1; Int_t iErrFlg; //tmp vars for TMinuit
+
+ if(!gMinuit) gMinuit = new TMinuit(5); //init MINUIT with this number of parameters (5 params)
+ gMinuit->mncler(); // reset Minuit list of paramters
+ gMinuit->SetObjectFit((TObject*)this); gMinuit->SetFCN(AliHMPIDRecon::FunMinEl); //set fit function
+ gMinuit->mnexcm("SET PRI",&aArg,1,iErrFlg); //suspend all printout from TMinuit
+ gMinuit->mnexcm("SET NOW",&aArg,0,iErrFlg); //suspend all warning printout from TMinuit
+
+ Double_t d1,d2,d3;
+ TString sName;
+
+ gMinuit->mnparm(0," A ",1,0.01,0,0,iErrFlg);
+ gMinuit->mnparm(1," B ",1,0.01,0,0,iErrFlg);
+ gMinuit->mnparm(2," H ",1,0.01,0,0,iErrFlg);
+ gMinuit->mnparm(3," G ",1,0.01,0,0,iErrFlg);
+ gMinuit->mnparm(4," F ",1,0.01,0,0,iErrFlg);
+
+ gMinuit->mnexcm("SIMPLEX",&aArg,0,iErrFlg);
+ gMinuit->mnexcm("MIGRAD" ,&aArg,0,iErrFlg);
+ gMinuit->mnpout(0,sName,cA,d1,d2,d3,iErrFlg);
+ gMinuit->mnpout(1,sName,cB,d1,d2,d3,iErrFlg);
+ gMinuit->mnpout(2,sName,cH,d1,d2,d3,iErrFlg);
+ gMinuit->mnpout(3,sName,cG,d1,d2,d3,iErrFlg);
+ gMinuit->mnpout(4,sName,cF,d1,d2,d3,iErrFlg);
+ delete gMinuit;
+
+ Double_t i2 = cA*cB-cH*cH; //quartic invariant : i2 > 0 ellipse, i2 < 0 hyperbola
+ if(i2<=0) return kFALSE;
+ Double_t aX = (cH*cF-cB*cG)/i2; //x centre of the canonical section
+ Double_t bY = (cH*cG-cA*cF)/i2; //y centre of the canonical section
+ Double_t alfa1 = TMath::ATan(2*cH/(cA-cB)); //alpha = angle of rotation of the conical section
+ if(alfa1<0) alfa1+=TMath::Pi();
+ alfa1*=0.5;
+// Double_t alfa2 = alfa1+TMath::Pi();
+ Double_t phiref = TMath::ATan2(bY-fMipY,aX-fMipX); //evaluate in a unique way the angle of rotation comparing it
+ if(phiref<0) phiref+=TMath::TwoPi(); //with the vector that points to the centre from the mip
+ if(i2<0) phiref+=TMath::Pi();
+ if(phiref>TMath::TwoPi()) phiref-=TMath::TwoPi();
+
+// Printf(" alfa1 %f",alfa1*TMath::RadToDeg());
+// Printf(" alfa2 %f",alfa2*TMath::RadToDeg());
+// Printf(" firef %f",phiref*TMath::RadToDeg());
+// if(TMath::Abs(alfa1-phiref)<TMath::Abs(alfa2-phiref)) phiRec = alfa1; else phiRec = alfa2;
+
+// Printf("FitEllipse: phi reconstructed %f",phiRec*TMath::RadToDeg());
+ phiRec=phiref;
+ return kTRUE;
+//
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Bool_t AliHMPIDRecon::FitFree(Double_t phiRec)
+{
+// Fit performed by minimizing RMS/sqrt(n) of the
+// photons reconstructed. First phi is fixed and theta
+// is fouond, then (th,ph) of the track
+// as free parameters
+// Arguments: PhiRec phi of the track
+// Returns: none
+ Double_t aArg=-1; Int_t iErrFlg; //tmp vars for TMinuit
+ if(!gMinuit) gMinuit = new TMinuit(2); //init MINUIT with this number of parameters (5 params)
+ gMinuit->mncler(); // reset Minuit list of paramters
+ gMinuit->SetObjectFit((TObject*)this); gMinuit->SetFCN(AliHMPIDRecon::FunMinPhot); //set fit function
+ gMinuit->mnexcm("SET PRI",&aArg,1,iErrFlg); //suspend all printout from TMinuit
+ gMinuit->mnexcm("SET NOW",&aArg,0,iErrFlg); //suspend all warning printout from TMinuit
+
+ Double_t d1,d2,d3;
+ TString sName;
+ Double_t th,ph;
+
+ gMinuit->mnparm(0," theta ", 0.01,0.01,0,TMath::PiOver2(),iErrFlg);
+ gMinuit->mnparm(1," phi ",phiRec,0.01,0,TMath::TwoPi() ,iErrFlg);
+
+ gMinuit->FixParameter(1);
+ gMinuit->mnexcm("SIMPLEX" ,&aArg,0,iErrFlg);
+ gMinuit->mnexcm("MIGRAD" ,&aArg,0,iErrFlg);
+ gMinuit->Release(1);
+ gMinuit->mnexcm("MIGRAD" ,&aArg,0,iErrFlg);
+
+ gMinuit->mnpout(0,sName,th,d1,d2,d3,iErrFlg);
+ gMinuit->mnpout(1,sName,ph,d1,d2,d3,iErrFlg);
+
+ Double_t outPar[2] = {th,ph}; Double_t g; Double_t f;Int_t flag = 3;
+ gMinuit->Eval(2, &g, f, outPar,flag);
+
+ SetTrkFit(th,ph);
+
+ return kTRUE;
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+Double_t AliHMPIDRecon::FunConSect(Double_t *c,Double_t x,Double_t y)
+{
+ return c[0]*x*x+c[1]*y*y+2*c[2]*x*y+2*c[3]*x+2*c[4]*y+1;
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+void AliHMPIDRecon::FunMinEl(Int_t &/* */,Double_t* /* */,Double_t &f,Double_t *par,Int_t /* */)
+{
+ AliHMPIDRecon *pRec=(AliHMPIDRecon*)gMinuit->GetObjectFit();
+ Double_t minFun = 0;
+ Int_t np = pRec->NClu();
+ for(Int_t i=0;i<np;i++) {
+ if(i==pRec->IdxMip()) continue;
+ Double_t el = pRec->FunConSect(par,pRec->XClu(i),pRec->YClu(i));
+ minFun +=el*el;
+ }
+ f = minFun;
+}
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+void AliHMPIDRecon::FunMinPhot(Int_t &/* */,Double_t* /* */,Double_t &f,Double_t *par,Int_t iflag)
+{
+ AliHMPIDRecon *pRec=(AliHMPIDRecon*)gMinuit->GetObjectFit();
+ Double_t sizeCh = 0.5*fgkRadThick+fgkWinThick+fgkGapThick;
+ Double_t thTrk = par[0];
+ Double_t phTrk = par[1];
+ Double_t xrad = pRec->MipX() - sizeCh*TMath::Tan(thTrk)*TMath::Cos(phTrk);
+ Double_t yrad = pRec->MipY() - sizeCh*TMath::Tan(thTrk)*TMath::Sin(phTrk);
+ pRec->SetRadXY(xrad,yrad);
+ pRec->SetTrack(xrad,yrad,thTrk,phTrk);
+
+ Double_t meanCkov =0;
+ Double_t meanCkov2=0;
+ Double_t thetaCer,phiCer;
+ Int_t nClAcc = 0;
+ Int_t nClTot=pRec->NClu();
+
+ for(Int_t i=0;i<nClTot;i++) {
+ if(!(pRec->ClCk(i))) continue;
+ pRec->FindPhotCkov(pRec->XClu(i),pRec->YClu(i),thetaCer,phiCer);
+ meanCkov += thetaCer;
+ meanCkov2 += thetaCer*thetaCer;
+ nClAcc++;
+ }
+ if(nClAcc==0) {f=999;return;}
+ meanCkov/=nClAcc;
+ Double_t rms = (meanCkov2 - meanCkov*meanCkov*nClAcc)/nClAcc;
+ if(rms<0) Printf(" rms2 = %f, strange!!!",rms);
+ rms = TMath::Sqrt(rms);
+ f = rms/TMath::Sqrt(nClAcc);
+
+
+ if(iflag==3) {
+ Printf("FunMinPhot before: photons candidates %i used %i",nClTot,nClAcc);
+ nClAcc = 0;
+ Double_t meanCkov1=0;
+ Double_t meanCkov2=0;
+ for(Int_t i=0;i<nClTot;i++) {
+ if(!(pRec->ClCk(i))) continue;
+ pRec->FindPhotCkov(pRec->XClu(i),pRec->YClu(i),thetaCer,phiCer);
+ if(TMath::Abs(thetaCer-meanCkov)<2*rms) {
+ meanCkov1 += thetaCer;
+ meanCkov2 += thetaCer*thetaCer;
+ nClAcc++;
+ } else pRec->SetClCk(i,kFALSE);
+ }
+ meanCkov1/=nClAcc;
+ Double_t rms2 = (meanCkov2 - meanCkov*meanCkov*nClAcc)/nClAcc;
+ Printf("FunMinPhot after: photons candidates %i used %i thetaCer %f",nClTot,nClAcc,meanCkov1);
+ pRec->SetCkovFit(meanCkov1);
+ pRec->SetCkovSig2(rms2);
+ pRec->SetNClu(nClAcc);
+ }
+}//FunMinPhot()
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+//
+// ended Hidden track algorithm....
+//
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff