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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
21 // Why should I put meaningless comments
25 //*-- Author: Yves Schutz (SUBATECH) & Gines Martinez (SUBATECH)
28 // --- ROOT system ---
30 // --- Standard library ---
34 // --- AliRoot header files ---
36 #include "AliPHOSPIDv1.h"
37 #include "AliPHOSTrackSegment.h"
38 #include "AliPHOSRecParticle.h"
39 #include "AliPHOSIndexToObject.h"
41 ClassImp( AliPHOSPIDv1)
43 //____________________________________________________________________________
44 AliPHOSPIDv1::AliPHOSPIDv1():AliPHOSPID()
46 fCutOnDispersion = 2.0;
47 fCutOnRelativeDistance = 3.0 ;
50 //____________________________________________________________________________
51 Float_t AliPHOSPIDv1::GetDistanceInPHOSPlane(AliPHOSEmcRecPoint * emcclu,AliPHOSPpsdRecPoint * PpsdClu, Bool_t &toofar, Option_t * Axis)
53 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
59 emcclu->GetLocalPosition(vecEmc) ;
60 PpsdClu->GetLocalPosition(vecPpsd) ;
61 if(emcclu->GetPHOSMod() == PpsdClu->GetPHOSMod())
64 // Correct to difference in CPV and EMC position due to different distance to center.
65 // we assume, that particle moves from center
66 Float_t dCPV = fGeom->GetIPtoOuterCoverDistance();
67 Float_t dEMC = fGeom->GetIPtoCrystalSurface() ;
69 vecPpsd = dEMC * vecPpsd - vecEmc ;
71 if (Axis == "X") r = vecPpsd.X();
72 if (Axis == "Y") r = vecPpsd.Y();
73 if (Axis == "Z") r = vecPpsd.Z();
74 if (Axis == "R") r = vecPpsd.Mag();
84 //____________________________________________________________________________
85 void AliPHOSPIDv1::MakeParticles(AliPHOSTrackSegment::TrackSegmentsList * trsl,
86 AliPHOSRecParticle::RecParticlesList * rpl)
88 // Makes a RecParticle out of a TrackSegment
91 AliPHOSTrackSegment * tracksegment ;
93 AliPHOSRecParticle * rp ;
96 Int_t showerprofile; // 0 narrow and 1 wide
97 Int_t cpvdetector ; // 1 hit and 0 no hit
98 Int_t pcdetector ; // 1 hit and 0 no hit
100 while ( (tracksegment = (AliPHOSTrackSegment *)next()) ) {
101 new( (*rpl)[index] ) AliPHOSRecParticle(tracksegment) ;
102 rp = (AliPHOSRecParticle *)rpl->At(index) ;
103 AliPHOSEmcRecPoint * recp = tracksegment->GetEmcRecPoint() ;
104 AliPHOSPpsdRecPoint * rpcpv = tracksegment->GetPpsdUpRecPoint() ;
105 AliPHOSPpsdRecPoint * rppc = tracksegment->GetPpsdLowRecPoint() ;
107 // Float_t * lambda = new Float_t[2];
108 // recp->GetElipsAxis(lambda) ;
110 // // Looking at the lateral development of the shower
111 // if ( ( lambda[0] > fLambda1m && lambda[0] < fLambda1M ) && // shower profile cut
112 // ( lambda[1] > fLambda2m && lambda[1] < fLambda2M ) )
114 // //R=(lambda[0]-1.386)*(lambda[0]-1.386)+1.707*1.707*(lambda[1]-1.008)*(lambda[1]-1.008) ;
118 dispersion = recp->GetDispersion();
119 if (dispersion < fCutOnDispersion)
120 showerprofile = 0 ; // NARROW PROFILE
122 showerprofile = 1 ;// WIDE PROFILE
125 // Looking at the photon conversion detector
126 if( tracksegment->GetPpsdLowRecPoint() == 0 )
127 pcdetector = 0 ; // No hit
129 if (GetDistanceInPHOSPlane(recp, rppc, tDistance, "R") < fCutOnRelativeDistance)
130 pcdetector = 1 ; // hit
135 // Looking at the photon conversion detector
136 if( tracksegment->GetPpsdUpRecPoint() == 0 )
137 cpvdetector = 0 ; // No hit
139 if (GetDistanceInPHOSPlane(recp, rpcpv, tDistance, "R")< fCutOnRelativeDistance)
140 cpvdetector = 1 ; // Hit
145 type = showerprofile + 2 * pcdetector + 4 * cpvdetector ;
152 //____________________________________________________________________________
153 void AliPHOSPIDv1:: Print(const char * opt)
155 // Print the parameters used for the particle type identification
157 cout << "AliPHOSPIDv1 : cuts for the particle idendification based on the shower profile " << endl
158 << fLambda1m << " < value1 < " << fLambda1M << endl
159 << fLambda2m << " < value2 < " << fLambda2M << endl ;
163 //____________________________________________________________________________
164 void AliPHOSPIDv1::SetShowerProfileCuts(Float_t l1m, Float_t l1M, Float_t l2m, Float_t l2M)
166 // Modifies the parameters used for the particle type identification
174 //____________________________________________________________________________
175 void AliPHOSPIDv1::SetRelativeDistanceCut(Float_t CutOnRelativeDistance)
177 // Modifies the parameters used for the particle type identification
179 fCutOnRelativeDistance = CutOnRelativeDistance ;