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14 **************************************************************************/
18 //_________________________________________________________________________
19 // Implementation version v1 of the PHOS particle identifier
20 // Identification is based on information from PPSD and EMC
22 //*-- Author: Yves Schutz (SUBATECH) & Gines Martinez (SUBATECH)
25 // --- ROOT system ---
27 // --- Standard library ---
31 // --- AliRoot header files ---
33 #include "AliPHOSPIDv1.h"
34 #include "AliPHOSTrackSegment.h"
35 #include "AliPHOSRecParticle.h"
36 #include "AliPHOSIndexToObject.h"
38 ClassImp( AliPHOSPIDv1)
40 //____________________________________________________________________________
41 AliPHOSPIDv1::AliPHOSPIDv1():AliPHOSPID()
43 fCutOnDispersion = 2.0;
44 fCutOnRelativeDistance = 3.0 ;
47 //____________________________________________________________________________
48 Float_t AliPHOSPIDv1::GetDistanceInPHOSPlane(AliPHOSEmcRecPoint * emcclu,AliPHOSPpsdRecPoint * PpsdClu, Bool_t &toofar, Option_t * Axis)
50 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
56 emcclu->GetLocalPosition(vecEmc) ;
57 PpsdClu->GetLocalPosition(vecPpsd) ;
58 if(emcclu->GetPHOSMod() == PpsdClu->GetPHOSMod())
61 // Correct to difference in CPV and EMC position due to different distance to center.
62 // we assume, that particle moves from center
63 Float_t dCPV = fGeom->GetIPtoOuterCoverDistance();
64 Float_t dEMC = fGeom->GetIPtoCrystalSurface() ;
66 vecPpsd = dEMC * vecPpsd - vecEmc ;
68 if (Axis == "X") r = vecPpsd.X();
69 if (Axis == "Y") r = vecPpsd.Y();
70 if (Axis == "Z") r = vecPpsd.Z();
71 if (Axis == "R") r = vecPpsd.Mag();
81 //____________________________________________________________________________
82 void AliPHOSPIDv1::MakeParticles(AliPHOSTrackSegment::TrackSegmentsList * trsl,
83 AliPHOSRecParticle::RecParticlesList * rpl)
85 // Makes a RecParticle out of a TrackSegment
88 AliPHOSTrackSegment * tracksegment ;
90 AliPHOSRecParticle * rp ;
93 Int_t showerprofile; // 0 narrow and 1 wide
94 Int_t cpvdetector ; // 1 hit and 0 no hit
95 Int_t pcdetector ; // 1 hit and 0 no hit
97 while ( (tracksegment = (AliPHOSTrackSegment *)next()) ) {
98 new( (*rpl)[index] ) AliPHOSRecParticle(tracksegment) ;
99 rp = (AliPHOSRecParticle *)rpl->At(index) ;
100 AliPHOSEmcRecPoint * recp = tracksegment->GetEmcRecPoint() ;
101 AliPHOSPpsdRecPoint * rpcpv = tracksegment->GetPpsdUpRecPoint() ;
102 AliPHOSPpsdRecPoint * rppc = tracksegment->GetPpsdLowRecPoint() ;
104 // Float_t * lambda = new Float_t[2];
105 // recp->GetElipsAxis(lambda) ;
107 // // Looking at the lateral development of the shower
108 // if ( ( lambda[0] > fLambda1m && lambda[0] < fLambda1M ) && // shower profile cut
109 // ( lambda[1] > fLambda2m && lambda[1] < fLambda2M ) )
111 // //R=(lambda[0]-1.386)*(lambda[0]-1.386)+1.707*1.707*(lambda[1]-1.008)*(lambda[1]-1.008) ;
115 Dispersion = recp->GetDispersion();
116 if (Dispersion < fCutOnDispersion)
117 showerprofile = 0 ; // NARROW PROFILE
119 showerprofile = 1 ;// WIDE PROFILE
122 // Looking at the photon conversion detector
123 if( tracksegment->GetPpsdLowRecPoint() == 0 )
124 pcdetector = 0 ; // No hit
126 if (GetDistanceInPHOSPlane(recp, rppc, tDistance, "R") < fCutOnRelativeDistance)
127 pcdetector = 1 ; // hit
132 // Looking at the photon conversion detector
133 if( tracksegment->GetPpsdUpRecPoint() == 0 )
134 cpvdetector = 0 ; // No hit
136 if (GetDistanceInPHOSPlane(recp, rpcpv, tDistance, "R")< fCutOnRelativeDistance)
137 cpvdetector = 1 ; // Hit
142 type = showerprofile + 2 * pcdetector + 4 * cpvdetector ;
149 //____________________________________________________________________________
150 void AliPHOSPIDv1:: Print(const char * opt)
152 // Print the parameters used for the particle type identification
154 cout << "AliPHOSPIDv1 : cuts for the particle idendification based on the shower profile " << endl
155 << fLambda1m << " < value1 < " << fLambda1M << endl
156 << fLambda2m << " < value2 < " << fLambda2M << endl ;
160 //____________________________________________________________________________
161 void AliPHOSPIDv1::SetShowerProfileCuts(Float_t l1m, Float_t l1M, Float_t l2m, Float_t l2M)
163 // Modifies the parameters used for the particle type identification
171 //____________________________________________________________________________
172 void AliPHOSPIDv1::SetRelativeDistanceCut(Float_t CutOnRelativeDistance)
174 // Modifies the parameters used for the particle type identification
176 fCutOnRelativeDistance = CutOnRelativeDistance ;