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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 Float_t AliPHOSPIDv1::GetDistanceInPHOSPlane(AliPHOSEmcRecPoint * emcclu,AliPHOSPpsdRecPoint * PpsdClu, Bool_t &toofar, Option_t * Axis)
43 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
49 emcclu->GetLocalPosition(vecEmc) ;
50 PpsdClu->GetLocalPosition(vecPpsd) ;
51 if(emcclu->GetPHOSMod() == PpsdClu->GetPHOSMod())
54 // Correct to difference in CPV and EMC position due to different distance to center.
55 // we assume, that particle moves from center
56 Float_t dCPV = fGeom->GetIPtoOuterCoverDistance();
57 Float_t dEMC = fGeom->GetIPtoCrystalSurface() ;
59 vecPpsd = dEMC * vecPpsd - vecEmc ;
61 if (Axis == "X") r = vecPpsd.X();
62 if (Axis == "Y") r = vecPpsd.Y();
63 if (Axis == "Z") r = vecPpsd.Z();
64 if (Axis == "R") r = vecPpsd.Mag();
77 //____________________________________________________________________________
78 void AliPHOSPIDv1::MakeParticles(AliPHOSTrackSegment::TrackSegmentsList * trsl,
79 AliPHOSRecParticle::RecParticlesList * rpl)
81 // Makes a RecParticle out of a TrackSegment
84 AliPHOSTrackSegment * tracksegment ;
86 AliPHOSRecParticle * rp ;
89 Int_t showerprofile; // 0 narrow and 1 wide
90 Int_t cpvdetector; // 1 hit and 0 no hit
91 Int_t pcdetector; // 1 hit and 0 no hit
93 while ( (tracksegment = (AliPHOSTrackSegment *)next()) ) {
94 new( (*rpl)[index] ) AliPHOSRecParticle(tracksegment) ;
95 rp = (AliPHOSRecParticle *)rpl->At(index) ;
96 AliPHOSEmcRecPoint * recp = tracksegment->GetEmcRecPoint() ;
97 AliPHOSPpsdRecPoint * rpcpv = tracksegment->GetPpsdUpRecPoint() ;
98 AliPHOSPpsdRecPoint * rppc = tracksegment->GetPpsdLowRecPoint() ;
100 // Float_t * lambda = new Float_t[2];
101 // recp->GetElipsAxis(lambda) ;
103 // // Looking at the lateral development of the shower
104 // if ( ( lambda[0] > fLambda1m && lambda[0] < fLambda1M ) && // shower profile cut
105 // ( lambda[1] > fLambda2m && lambda[1] < fLambda2M ) )
107 // //R=(lambda[0]-1.386)*(lambda[0]-1.386)+1.707*1.707*(lambda[1]-1.008)*(lambda[1]-1.008) ;
111 Dispersion = recp->GetDispersion();
112 if (Dispersion < fCutOnDispersion)
113 showerprofile = 0 ; // NARROW PROFILE
115 showerprofile = 1 ;// WIDE PROFILE
117 // Looking at the photon conversion detector
118 if( tracksegment->GetPpsdLowRecPoint() == 0 )
119 pcdetector = 0 ; // No hit
121 if (GetDistanceInPHOSPlane(recp, rppc, tDistance, "R")< fCutOnRelativeDistance) pcdetector = 1 ; // hit
123 // Looking at the photon conversion detector
124 if( tracksegment->GetPpsdUpRecPoint() == 0 )
125 cpvdetector = 0 ; // No hit
127 if (GetDistanceInPHOSPlane(recp, rpcpv, tDistance, "R")< fCutOnRelativeDistance) cpvdetector = 1 ; // Hit
129 type = showerprofile + 2 * pcdetector + 4 * cpvdetector ;
136 //____________________________________________________________________________
137 void AliPHOSPIDv1:: Print(const char * opt)
139 // Print the parameters used for the particle type identification
141 cout << "AliPHOSPIDv1 : cuts for the particle idendification based on the shower profile " << endl
142 << fLambda1m << " < value1 < " << fLambda1M << endl
143 << fLambda2m << " < value2 < " << fLambda2M << endl ;
147 //____________________________________________________________________________
148 void AliPHOSPIDv1::SetShowerProfileCuts(Float_t l1m, Float_t l1M, Float_t l2m, Float_t l2M)
150 // Modifies the parameters used for the particle type identification
158 //____________________________________________________________________________
159 void AliPHOSPIDv1::SetRelativeDistanceCut(Float_t CutOnRelativeDistance)
161 // Modifies the parameters used for the particle type identification
163 fCutOnRelativeDistance = CutOnRelativeDistance ;