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4 * Author: The ALICE Off-line Project. *
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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)
25 // --- ROOT system ---
27 // --- Standard library ---
31 // --- AliRoot header files ---
33 #include "AliPHOSPIDv1.h"
34 #include "AliPHOSTrackSegment.h"
35 #include "AliPHOSRecParticle.h"
37 ClassImp( AliPHOSPIDv1)
39 //____________________________________________________________________________
40 void AliPHOSPIDv1::MakeParticles(TrackSegmentsList * trsl, RecParticlesList * rpl)
42 // Makes a RecParticle out of a TrackSegment
45 AliPHOSTrackSegment * tracksegment ;
47 AliPHOSRecParticle * rp ;
50 while ( (tracksegment = (AliPHOSTrackSegment *)next()) ) {
51 new( (*rpl)[index] ) AliPHOSRecParticle(tracksegment) ;
52 rp = (AliPHOSRecParticle *)(*rpl)[index] ;
54 // try to figure out the type of particle:
55 // 1. just looking at the PPSD information
56 if( tracksegment->GetPpsdUp() == 0 ) { // Neutral
58 if( tracksegment->GetPpsdLow() == 0 ) // Neutral
60 else { // check the shower profile
61 AliPHOSEmcRecPoint * recp = tracksegment->GetEmcRecPoint() ;
62 Float_t * lambda = new Float_t[2];
63 recp->GetElipsAxis(lambda) ;
64 if ( ( lambda[0] > fLambda1m && lambda[0] < fLambda1M ) && // shower profile cut
65 ( lambda[1] > fLambda2m && lambda[1] < fLambda2M ) )
66 type = kGAMMA ; // a well identified photon
68 type = kGAMMAHADRON ; // looks like a photon but is a hadron (most likely)
74 // 2. from the shower profile analysis
75 if ( type == kNEUTRAL ) {
76 AliPHOSEmcRecPoint * recp = tracksegment->GetEmcRecPoint() ;
77 Float_t * lambda = new Float_t[2];
78 recp->GetElipsAxis(lambda) ;
79 if ( ( lambda[0] > fLambda1m && lambda[0] < fLambda1M ) && // shower profile cut
80 ( lambda[1] > fLambda2m && lambda[1] < fLambda2M ) )
83 type = kNEUTRALHADRON ;
87 // 3. from the shower dispersion
88 if (type == kCHARGED) {
89 if( tracksegment->GetEmcRecPoint()->GetDispersion() > fCutOnDispersion) // shower dispersion cut
90 type = kCHARGEDHADRON ;
100 //____________________________________________________________________________
101 void AliPHOSPIDv1:: Print()
103 // Print the parameters used for the particle type identification
105 cout << "AliPHOSPIDv1 : cuts for the particle idendification based on the shower profile " << endl
106 << fLambda1m << " < value1 < " << fLambda1M << endl
107 << fLambda2m << " < value2 < " << fLambda2M << endl ;
111 //____________________________________________________________________________
112 void AliPHOSPIDv1::SetShowerProfileCuts(Float_t l1m, Float_t l1M, Float_t l2m, Float_t l2M)
114 // Modifies the parameters used for the particle type identification