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fd1d0cb9 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-2006, 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 | ||
27de2dfb | 16 | /* $Id$ */ |
17 | ||
fd1d0cb9 | 18 | ///////////////////////////////////////////////////////////// |
19 | // | |
20 | // class used to extract and store reco info of dimu candidate | |
21 | // | |
22 | // Author: X-M. Zhang, zhang@clermont.in2p3.fr | |
23 | // zhangxm@iopp.ccnu.edu.cn | |
24 | ///////////////////////////////////////////////////////////// | |
25 | ||
26 | #include <TDatabasePDG.h> | |
27 | #include <TLorentzVector.h> | |
28 | ||
29 | #include "AliMuonInfoStoreRD.h" | |
30 | #include "AliDimuInfoStoreRD.h" | |
31 | ||
32 | ClassImp(AliDimuInfoStoreRD) | |
33 | ||
34 | const TString AliDimuInfoStoreRD::fgkStdBranchName("DimuRD"); | |
fd1d0cb9 | 35 | |
36 | //----------------------------------------------------------------------------- | |
37 | AliDimuInfoStoreRD::AliDimuInfoStoreRD() : | |
38 | TObject(), | |
9bbc42ca | 39 | fSelMask(0), |
fd1d0cb9 | 40 | fMomentum(), |
41 | fCharge(0), | |
42 | fInvM(0.) | |
43 | { | |
44 | // | |
45 | // default constructor | |
46 | // | |
47 | for (Int_t i=2; i--;) fMuonRef[i] = 0; | |
48 | } | |
49 | ||
50 | //----------------------------------------------------------------------------- | |
9bbc42ca | 51 | AliDimuInfoStoreRD::AliDimuInfoStoreRD(AliMuonInfoStoreRD* const trk0, AliMuonInfoStoreRD* const trk1, UInt_t selMask) : |
fd1d0cb9 | 52 | TObject(), |
9bbc42ca | 53 | fSelMask(selMask), |
fd1d0cb9 | 54 | fMomentum(), |
55 | fCharge(0), | |
56 | fInvM(0.) | |
57 | { | |
58 | // | |
59 | // default constructor | |
60 | // | |
61 | fMuonRef[0] = trk0; | |
62 | fMuonRef[1] = trk1; | |
63 | FillDimuInfo(); | |
64 | } | |
65 | ||
66 | //----------------------------------------------------------------------------- | |
67 | AliDimuInfoStoreRD::AliDimuInfoStoreRD(const AliDimuInfoStoreRD &src) : | |
68 | TObject(src), | |
9bbc42ca | 69 | fSelMask(src.fSelMask), |
fd1d0cb9 | 70 | fMomentum(src.fMomentum), |
71 | fCharge(src.fCharge), | |
72 | fInvM(src.fInvM) | |
73 | { | |
74 | // | |
75 | // copy constructor | |
76 | // | |
77 | for (Int_t i=2; i--;) fMuonRef[i] = src.fMuonRef[i]; | |
78 | } | |
79 | ||
80 | //----------------------------------------------------------------------------- | |
81 | AliDimuInfoStoreRD& AliDimuInfoStoreRD::operator=(const AliDimuInfoStoreRD &src) | |
82 | { | |
83 | // | |
84 | // assignment constructor | |
85 | // | |
86 | if(&src==this) return *this; | |
87 | ||
9bbc42ca | 88 | fSelMask = src.fSelMask; |
fd1d0cb9 | 89 | fMomentum = src.fMomentum; |
90 | fCharge = src.fCharge; | |
91 | fInvM = src.fInvM; | |
92 | for (Int_t i=2; i--;) fMuonRef[i] = src.fMuonRef[i]; | |
93 | ||
94 | return *this; | |
95 | } | |
96 | ||
97 | //----------------------------------------------------------------------------- | |
98 | AliDimuInfoStoreRD::~AliDimuInfoStoreRD() | |
99 | { | |
100 | // | |
101 | // destructor | |
102 | // | |
103 | } | |
104 | ||
105 | //----------------------------------------------------------------------------- | |
106 | void AliDimuInfoStoreRD::FillDimuInfo() | |
107 | { | |
108 | // fill dimuon candidate info from the corresponding two muon tracks | |
109 | ||
110 | AliMuonInfoStoreRD *trk0 = (AliMuonInfoStoreRD*)fMuonRef[0].GetObject(); | |
111 | AliMuonInfoStoreRD *trk1 = (AliMuonInfoStoreRD*)fMuonRef[1].GetObject(); | |
112 | ||
9bbc42ca | 113 | fMomentum = trk0->MomentumAtVtx() + trk1->MomentumAtVtx(); |
fd1d0cb9 | 114 | fCharge = trk0->Charge() + trk1->Charge(); |
115 | ||
116 | Double_t mMu = TDatabasePDG::Instance()->GetParticle(13)->Mass(); | |
117 | TLorentzVector lorentzP0, lorentzP1, lorentzP; | |
9bbc42ca | 118 | lorentzP0.SetVectM(trk0->MomentumAtVtx(), mMu); |
119 | lorentzP1.SetVectM(trk1->MomentumAtVtx(), mMu); | |
fd1d0cb9 | 120 | lorentzP = lorentzP0 + lorentzP1; |
121 | fInvM = lorentzP.Mag(); | |
122 | ||
123 | trk0 = 0; | |
124 | trk1 = 0; | |
125 | return; | |
126 | } |