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6ad0bfa0 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
b2a60966 | 16 | /* $Id$ */ |
17 | ||
6ad0bfa0 | 18 | //_________________________________________________________________________ |
b2a60966 | 19 | // Implementation version v1 of the PHOS particle identifier |
20 | // Identification is based on information from PPSD and EMC | |
21 | // | |
22 | //*-- Author: Yves Schutz (SUBATECH) | |
23 | ||
6ad0bfa0 | 24 | |
25 | // --- ROOT system --- | |
26 | ||
27 | // --- Standard library --- | |
28 | ||
de9ec31b | 29 | #include <iostream.h> |
6ad0bfa0 | 30 | |
31 | // --- AliRoot header files --- | |
32 | ||
26d4b141 | 33 | #include "AliPHOSPIDv1.h" |
6ad0bfa0 | 34 | #include "AliPHOSTrackSegment.h" |
35 | #include "AliPHOSRecParticle.h" | |
83974468 | 36 | #include "AliPHOSIndexToObject.h" |
6ad0bfa0 | 37 | |
26d4b141 | 38 | ClassImp( AliPHOSPIDv1) |
6ad0bfa0 | 39 | |
6ad0bfa0 | 40 | //____________________________________________________________________________ |
0dd37dda | 41 | void AliPHOSPIDv1::MakeParticles(TrackSegmentsList * trsl, RecParticlesList * rpl) |
6ad0bfa0 | 42 | { |
b2a60966 | 43 | // Makes a RecParticle out of a TrackSegment |
6ad0bfa0 | 44 | |
45 | TIter next(trsl) ; | |
46 | AliPHOSTrackSegment * tracksegment ; | |
47 | Int_t index = 0 ; | |
09fc14a0 | 48 | AliPHOSRecParticle * rp ; |
0dd37dda | 49 | Int_t type ; |
50 | ||
6ad0bfa0 | 51 | while ( (tracksegment = (AliPHOSTrackSegment *)next()) ) { |
09fc14a0 | 52 | new( (*rpl)[index] ) AliPHOSRecParticle(tracksegment) ; |
83974468 | 53 | rp = (AliPHOSRecParticle *)rpl->At(index) ; |
0dd37dda | 54 | |
55 | // try to figure out the type of particle: | |
56 | // 1. just looking at the PPSD information | |
83974468 | 57 | |
58 | if( tracksegment->GetPpsdUpRecPoint() == 0 ) { // Neutral | |
0dd37dda | 59 | |
83974468 | 60 | if( tracksegment->GetPpsdLowRecPoint() == 0 ) // Neutral |
0dd37dda | 61 | type = kNEUTRAL ; |
c1d256cb | 62 | else { // check the shower profile |
63 | AliPHOSEmcRecPoint * recp = tracksegment->GetEmcRecPoint() ; | |
64 | Float_t * lambda = new Float_t[2]; | |
65 | recp->GetElipsAxis(lambda) ; | |
66 | if ( ( lambda[0] > fLambda1m && lambda[0] < fLambda1M ) && // shower profile cut | |
67 | ( lambda[1] > fLambda2m && lambda[1] < fLambda2M ) ) | |
68 | type = kGAMMA ; // a well identified photon | |
69 | else | |
70 | type = kGAMMAHADRON ; // looks like a photon but is a hadron (most likely) | |
71 | } | |
72 | } // Neutral | |
0dd37dda | 73 | else // Charged |
74 | type = kCHARGED ; | |
83974468 | 75 | |
0dd37dda | 76 | // 2. from the shower profile analysis |
77 | if ( type == kNEUTRAL ) { | |
09fc14a0 | 78 | AliPHOSEmcRecPoint * recp = tracksegment->GetEmcRecPoint() ; |
79 | Float_t * lambda = new Float_t[2]; | |
80 | recp->GetElipsAxis(lambda) ; | |
81 | if ( ( lambda[0] > fLambda1m && lambda[0] < fLambda1M ) && // shower profile cut | |
82 | ( lambda[1] > fLambda2m && lambda[1] < fLambda2M ) ) | |
b9bbdad1 | 83 | type = kNEUTRALEM ; |
09fc14a0 | 84 | else |
b9bbdad1 | 85 | type = kNEUTRALHADRON ; |
09fc14a0 | 86 | delete lambda ; |
87 | } | |
0dd37dda | 88 | |
89 | // 3. from the shower dispersion | |
09fc14a0 | 90 | if (type == kCHARGED) { |
83974468 | 91 | |
09fc14a0 | 92 | if( tracksegment->GetEmcRecPoint()->GetDispersion() > fCutOnDispersion) // shower dispersion cut |
93 | type = kCHARGEDHADRON ; | |
83974468 | 94 | // else |
95 | // type = kELECTRON ; | |
09fc14a0 | 96 | } |
97 | rp->SetType(type) ; | |
6ad0bfa0 | 98 | index++ ; |
99 | } | |
100 | ||
101 | } | |
102 | ||
09fc14a0 | 103 | //____________________________________________________________________________ |
104 | void AliPHOSPIDv1:: Print() | |
105 | { | |
b2a60966 | 106 | // Print the parameters used for the particle type identification |
107 | ||
09fc14a0 | 108 | cout << "AliPHOSPIDv1 : cuts for the particle idendification based on the shower profile " << endl |
109 | << fLambda1m << " < value1 < " << fLambda1M << endl | |
110 | << fLambda2m << " < value2 < " << fLambda2M << endl ; | |
111 | ||
112 | } | |
113 | ||
114 | //____________________________________________________________________________ | |
115 | void AliPHOSPIDv1::SetShowerProfileCuts(Float_t l1m, Float_t l1M, Float_t l2m, Float_t l2M) | |
116 | { | |
b2a60966 | 117 | // Modifies the parameters used for the particle type identification |
118 | ||
09fc14a0 | 119 | fLambda1m = l1m ; |
120 | fLambda1M = l1M ; | |
121 | fLambda2m = l2m ; | |
122 | fLambda2M = l2M ; | |
123 | } |