1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
16 //_________________________________________________________________________
17 // Algorithm class to identify the type of particle from the PHOS TrackSegment alone
18 //*-- Author : Y. Schutz SUBATECH
19 //////////////////////////////////////////////////////////////////////////////
21 // --- ROOT system ---
23 // --- Standard library ---
27 // --- AliRoot header files ---
29 #include "AliPHOSPIDv1.h"
30 #include "AliPHOSTrackSegment.h"
31 #include "AliPHOSRecParticle.h"
33 ClassImp( AliPHOSPIDv1)
36 //____________________________________________________________________________
37 AliPHOSPIDv1::AliPHOSPIDv1(): fCutOnDispersion(1.5)
44 //____________________________________________________________________________
45 AliPHOSPIDv1::~AliPHOSPIDv1()
51 //____________________________________________________________________________
52 void AliPHOSPIDv1::MakeParticles(TrackSegmentsList * trsl, RecParticlesList * rpl)
54 // main function, does the job
57 AliPHOSTrackSegment * tracksegment ;
59 AliPHOSRecParticle * rp ;
62 while ( (tracksegment = (AliPHOSTrackSegment *)next()) ) {
63 new( (*rpl)[index] ) AliPHOSRecParticle(tracksegment) ;
64 rp = (AliPHOSRecParticle *)(*rpl)[index] ;
66 // try to figure out the type of particle:
67 // 1. just looking at the PPSD information
68 if( tracksegment->GetPpsdUp() == 0 ) { // Neutral
70 if( tracksegment->GetPpsdLow() == 0 ) // Neutral
72 else { // check the shower profile
73 AliPHOSEmcRecPoint * recp = tracksegment->GetEmcRecPoint() ;
74 Float_t * lambda = new Float_t[2];
75 recp->GetElipsAxis(lambda) ;
76 if ( ( lambda[0] > fLambda1m && lambda[0] < fLambda1M ) && // shower profile cut
77 ( lambda[1] > fLambda2m && lambda[1] < fLambda2M ) )
78 type = kGAMMA ; // a well identified photon
80 type = kGAMMAHADRON ; // looks like a photon but is a hadron (most likely)
86 // 2. from the shower profile analysis
87 if ( type == kNEUTRAL ) {
88 AliPHOSEmcRecPoint * recp = tracksegment->GetEmcRecPoint() ;
89 Float_t * lambda = new Float_t[2];
90 recp->GetElipsAxis(lambda) ;
91 if ( ( lambda[0] > fLambda1m && lambda[0] < fLambda1M ) && // shower profile cut
92 ( lambda[1] > fLambda2m && lambda[1] < fLambda2M ) )
95 type = kNEUTRALHADRON ;
99 // 3. from the shower dispersion
100 if (type == kCHARGED) {
101 if( tracksegment->GetEmcRecPoint()->GetDispersion() > fCutOnDispersion) // shower dispersion cut
102 type = kCHARGEDHADRON ;
112 //____________________________________________________________________________
113 void AliPHOSPIDv1:: Print()
115 cout << "AliPHOSPIDv1 : cuts for the particle idendification based on the shower profile " << endl
116 << fLambda1m << " < value1 < " << fLambda1M << endl
117 << fLambda2m << " < value2 < " << fLambda2M << endl ;
121 //____________________________________________________________________________
122 void AliPHOSPIDv1::SetShowerProfileCuts(Float_t l1m, Float_t l1M, Float_t l2m, Float_t l2M)