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e62c1aea | 1 | /************************************************************************** |
2 | * Copyright(c) 2005-2007, 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 | ||
16 | //-----------------------------------------------------------------------// | |
17 | // ITS PID class --- method # 2 // | |
18 | // // | |
19 | // // | |
20 | //The PID is based on the likelihood of all the four ITS' layers, // | |
21 | //without using the truncated mean for the dE/dx. The response // | |
22 | //functions for each layer are convoluted Landau-Gaussian functions. // | |
23 | // Origin: Elena Bruna bruna@to.infn.it, Massimo Masera masera@to.infn.it// | |
24 | //-----------------------------------------------------------------------// | |
25 | ||
26 | #include "AliITSpidESD2.h" | |
af885e0f | 27 | #include "AliESDEvent.h" |
e62c1aea | 28 | #include "AliESDtrack.h" |
29 | #include "AliITStrackV2.h" | |
60b9526b | 30 | #include "AliITSRecPoint.h" |
e62c1aea | 31 | #include "AliITStrackerMI.h" |
32 | #include "AliITSLoader.h" | |
33 | #include "AliITSPident.h" | |
34 | #include "AliITSSteerPid.h" | |
35 | #include "AliLog.h" | |
36 | ||
37 | ClassImp(AliITSpidESD2) | |
38 | //_________________________________________________________________________ | |
94631b2f | 39 | AliITSpidESD2::AliITSpidESD2():AliITSpidESD(), |
40 | fTracker(0), | |
41 | fLoader(0), | |
42 | fSp(0) | |
e62c1aea | 43 | { // |
44 | // The main constructor | |
e62c1aea | 45 | } |
46 | //_________________________________________________________________________ | |
94631b2f | 47 | AliITSpidESD2::AliITSpidESD2(AliITStrackerMI* tracker,AliITSLoader* loader):AliITSpidESD(), |
48 | fTracker(0), | |
49 | fLoader(0), | |
50 | fSp(0) | |
e62c1aea | 51 | { // |
52 | // The main constructor | |
53 | fTracker=tracker; | |
54 | fLoader=loader; | |
55 | fSp=new AliITSSteerPid(); | |
56 | fSp->InitLayer(); | |
57 | } | |
58 | //_________________________________________________________________________ | |
59 | AliITSpidESD2::~AliITSpidESD2(){ | |
60 | //destructor | |
61 | ||
62 | if(fSp)delete fSp; | |
63 | ||
64 | } | |
65 | //______________________________________________________________________ | |
94631b2f | 66 | AliITSpidESD2::AliITSpidESD2(const AliITSpidESD2 &ob) :AliITSpidESD(ob), |
67 | fTracker(ob.fTracker), | |
68 | fLoader(ob.fLoader), | |
69 | fSp(ob.fSp) | |
70 | { | |
e62c1aea | 71 | // Copy constructor |
94631b2f | 72 | |
e62c1aea | 73 | } |
74 | ||
75 | //______________________________________________________________________ | |
94631b2f | 76 | AliITSpidESD2& AliITSpidESD2::operator=(const AliITSpidESD2& ob ){ |
e62c1aea | 77 | // Assignment operator |
94631b2f | 78 | this->~AliITSpidESD2(); |
79 | new(this) AliITSpidESD2(ob); | |
e62c1aea | 80 | return *this; |
81 | } | |
82 | ||
83 | //_________________________________________________________________________ | |
af885e0f | 84 | Int_t AliITSpidESD2::MakePID(AliESDEvent *event) |
e62c1aea | 85 | { |
86 | ||
87 | // | |
88 | // This function calculates the "detector response" PID probabilities | |
89 | // | |
90 | Double_t xr,par[5]; | |
91 | AliITStrackV2* track=0; | |
92 | fLoader->LoadRecPoints(); | |
93 | TTree *cTree=fLoader->TreeR(); | |
94 | fTracker->LoadClusters(cTree); | |
b68da4a2 | 95 | printf("==== Landau Fit PID ITS ====== \n"); |
e62c1aea | 96 | Int_t ntrk=event->GetNumberOfTracks(); |
97 | Double_t momits; | |
98 | // for (Int_t i=0; i<ntrk; i++) { | |
99 | for (Int_t i=0; i<ntrk; i++) { | |
100 | AliESDtrack *esdtr=event->GetTrack(i); | |
101 | if ((esdtr->GetStatus()&AliESDtrack::kITSin )==0) | |
102 | if ((esdtr->GetStatus()&AliESDtrack::kITSout)==0) continue; | |
103 | ||
104 | track = new AliITStrackV2(*esdtr); | |
105 | Double_t dEdxsignal=track->GetdEdx(); | |
106 | track->GetExternalParameters(xr,par); | |
107 | if (par[4]!=0) { | |
108 | Float_t lamb=TMath::ATan(par[3]); | |
109 | momits=1/(TMath::Abs(par[4])*TMath::Cos(lamb)); | |
110 | } | |
111 | else { | |
112 | AliWarning("Null particle momentum in ITS"); | |
113 | momits = 0.; | |
114 | } | |
115 | Double_t snp=track->GetSnp(); | |
116 | Double_t tgl=track->GetTgl(); | |
117 | const Int_t kns=AliPID::kSPECIES; | |
118 | Double_t condprobfun[kns]; | |
119 | for(Int_t ii=0;ii<kns;ii++)condprobfun[ii]=0; | |
b68da4a2 | 120 | Int_t cluind[12]; |
121 | for(Int_t ii=0;ii<12;ii++){ | |
122 | cluind[ii]=track->GetClusterIndex(ii); | |
e62c1aea | 123 | } |
b68da4a2 | 124 | AliITSRecPoint* cluarr[12]; |
125 | Float_t qclu[8],qclucorr[8],nlay[8]; | |
126 | for(Int_t i=0;i<8;i++){ | |
127 | qclu[i]=0; | |
128 | qclucorr[i]=0; | |
129 | nlay[i]=0; | |
e62c1aea | 130 | } |
b68da4a2 | 131 | Int_t jj=0; |
132 | for(Int_t i=0;i<12;i++){ | |
133 | cluind[i]=track->GetClusterIndex(i); | |
134 | if(cluind[i]>0){ | |
135 | cluarr[i]=(AliITSRecPoint*)fTracker->GetCluster(cluind[i]); | |
136 | Int_t lay=cluarr[i]->GetLayer(); | |
137 | if(lay>1){//sdd+ssd only | |
138 | qclu[jj]=cluarr[i]->GetQ(); | |
139 | qclucorr[jj]=qclu[jj]*TMath::Sqrt((1-snp*snp)/(1+tgl*tgl)); | |
140 | nlay[jj]=lay; | |
141 | jj++; | |
142 | } | |
143 | else qclucorr[jj]=-1; | |
144 | } | |
e62c1aea | 145 | } |
b68da4a2 | 146 | |
e62c1aea | 147 | Float_t prip=0.33; |
148 | Float_t prik=0.33; | |
149 | Float_t pripi=0.33; | |
150 | Float_t prie=0.; | |
b68da4a2 | 151 | AliITSPident mypid(momits,dEdxsignal,fSp,qclucorr,nlay,prip,prik,pripi,prie); |
152 | condprobfun[0]=mypid.GetProdCondFunPi();//el --PID in the ITS does not distinguish among Pi,el,mu | |
153 | condprobfun[1]=mypid.GetProdCondFunPi();//mu | |
154 | condprobfun[2]=mypid.GetProdCondFunPi();//pi | |
e62c1aea | 155 | condprobfun[3]=mypid.GetProdCondFunK();//kaon |
156 | condprobfun[4]=mypid.GetProdCondFunPro();//pro | |
157 | ||
158 | esdtr->SetITSpid(condprobfun); | |
159 | ||
160 | delete track; | |
161 | } | |
162 | fTracker->UnloadClusters(); | |
163 | fLoader->UnloadRecPoints(); | |
164 | return 0; | |
165 | } |