New class AliHMPIDPid added. Now HMPID could run PID even on ESD within the same...
[u/mrichter/AliRoot.git] / HMPID / AliHMPIDRecon.cxx
index cf23978fbd01483e7ba0e46dbd2fc2bfbeb18648..0f3257c5fe29372c6d34b284311f48d40ef7f96b 100644 (file)
@@ -324,7 +324,7 @@ Double_t AliHMPIDRecon::FindRingCkov(Int_t)
       weightThetaCerenkov += fPhotCkov[i]*fPhotWei[i];
       wei += fPhotWei[i];                                                    //collect weight as sum of all candidate weghts   
       
-      sigma2 += 1./Sigma2(fPhotCkov[i],fPhotPhi[i]);
+      sigma2 += 1./fParam->Sigma2(fTrkDir.Theta(),fTrkDir.Phi(),fPhotCkov[i],fPhotPhi[i]);
     }
   }//candidates loop
   
@@ -456,118 +456,3 @@ Double_t AliHMPIDRecon::HoughResponse()
   return (Double_t)(locMax*fDTheta+0.5*fDTheta); //final most probable track theta ckov   
 }//HoughResponse()
 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-Double_t AliHMPIDRecon::Sigma2(Double_t ckovTh, Double_t ckovPh)const
-{
-// Analithical calculation of total error (as a sum of localization, geometrical and chromatic errors) on Cerenkov angle for a given Cerenkov photon 
-// created by a given MIP. Fromulae according to CERN-EP-2000-058 
-// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
-//            dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]        
-//            MIP beta
-//   Returns: absolute error on Cerenkov angle, [radians]    
-  
-  TVector3 v(-999,-999,-999);
-  Double_t trkBeta = 1./(TMath::Cos(ckovTh)*fParam->GetRefIdx());
-  
-  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));
-  v.SetZ(SigCrom(ckovTh,ckovPh,trkBeta));
-
-  return v.Mag2();
-}
-//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-Double_t AliHMPIDRecon::SigLoc(Double_t thetaC, Double_t phiC,Double_t betaM)const
-{
-// Analithical calculation of localization error (due to finite segmentation of PC) on Cerenkov angle for a given Cerenkov photon 
-// created by a given MIP. Fromulae according to CERN-EP-2000-058 
-// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
-//            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 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.-fParam->GetRefIdx()*fParam->GetRefIdx()+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 kk = betaM*TMath::Sqrt(k)/(fParam->GapThick()*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
-
-  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
-{
-// Analithical calculation of chromatic error (due to lack of knowledge of Cerenkov photon energy) on Cerenkov angle for a given Cerenkov photon 
-// created by a given MIP. Fromulae according to CERN-EP-2000-058 
-// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
-//            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 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*fParam->GetRefIdx()*betaM*betaM/(alpha*tantheta);                    // formula (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()
-//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-Double_t AliHMPIDRecon::SigGeom(Double_t thetaC, Double_t phiC,Double_t betaM)const
-{
-// Analithical calculation of geometric error (due to lack of knowledge of creation point in radiator) on Cerenkov angle for a given Cerenkov photon 
-// created by a given MIP. Formulae according to CERN-EP-2000-058 
-// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
-//            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 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.-fParam->GetRefIdx()*fParam->GetRefIdx()+alpha*alpha/(betaM*betaM);         // formula (after 8 in the text)
-  if (k<0) return 1e10;
-
-  Double_t eTr = 0.5*fParam->RadThick()*betaM*TMath::Sqrt(k)/(fParam->GapThick()*alpha);     // formula (14)
-  Double_t lambda = 1.-sint*sint*sinf*sinf;                                                  // formula (15)
-
-  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/(fParam->GapThick()*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)/(fParam->GapThick()*betaM);               // formula (13.d)
-  Double_t dtdT = c1 * (c2+c3*c4);
-  Double_t trErr = fParam->RadThick()/(TMath::Sqrt(12.)*cost);
-
-  return trErr*dtdT;
-}//SigGeom()