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Commit | Line | Data |
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cc2b5fb5 | 1 | // $Id$ |
b0a53615 | 2 | // |
a93ef37c | 3 | // Task to constrain TPC tracks to SPD vertex. |
b0a53615 | 4 | // |
5 | // | |
cc2b5fb5 | 6 | |
7 | #include <TClonesArray.h> | |
8 | #include <TGeoGlobalMagField.h> | |
9 | #include "AliAnalysisManager.h" | |
10 | #include "AliESDEvent.h" | |
11 | #include "AliESDtrackCuts.h" | |
12 | #include "AliEmcalEsdTpcTrackTask.h" | |
13 | #include "AliMagF.h" | |
14 | ||
15 | ClassImp(AliEmcalEsdTpcTrackTask) | |
16 | ||
17 | //________________________________________________________________________ | |
18 | AliEmcalEsdTpcTrackTask::AliEmcalEsdTpcTrackTask() : | |
19 | AliAnalysisTaskSE(), | |
20 | fEsdTrackCuts(0), | |
4d1e3842 | 21 | fDoSpdVtxCon(0), |
57184cc6 | 22 | fHybridTrackCuts(0), |
cc2b5fb5 | 23 | fTracksName(), |
24 | fEsdEv(0), | |
25 | fTracks(0) | |
26 | { | |
a93ef37c | 27 | // Constructor. |
cc2b5fb5 | 28 | } |
29 | ||
30 | //________________________________________________________________________ | |
31 | AliEmcalEsdTpcTrackTask::AliEmcalEsdTpcTrackTask(const char *name) : | |
32 | AliAnalysisTaskSE(name), | |
33 | fEsdTrackCuts(0), | |
4d1e3842 | 34 | fDoSpdVtxCon(0), |
57184cc6 | 35 | fHybridTrackCuts(0), |
cc2b5fb5 | 36 | fTracksName("TpcSpdVertexConstrainedTracks"), |
37 | fEsdEv(0), | |
38 | fTracks(0) | |
39 | { | |
a93ef37c | 40 | // Constructor. |
41 | fBranchNames = "ESD:AliESDHeader.,AliESDRun.,SPDVertex.,Tracks"; | |
cc2b5fb5 | 42 | } |
43 | ||
44 | //________________________________________________________________________ | |
45 | AliEmcalEsdTpcTrackTask::~AliEmcalEsdTpcTrackTask() | |
46 | { | |
47 | //Destructor | |
48 | ||
49 | delete fEsdTrackCuts; | |
50 | } | |
51 | ||
52 | //________________________________________________________________________ | |
53 | void AliEmcalEsdTpcTrackTask::UserCreateOutputObjects() | |
54 | { | |
a93ef37c | 55 | // Create histograms. |
cc2b5fb5 | 56 | |
57 | fTracks = new TClonesArray("AliESDtrack"); | |
58 | fTracks->SetName(fTracksName); | |
59 | ||
60 | if (!fEsdTrackCuts) { | |
dd5a823e | 61 | AliInfo("No track cuts given, creating default (standard only TPC) cuts"); |
cc2b5fb5 | 62 | fEsdTrackCuts = AliESDtrackCuts::GetStandardTPCOnlyTrackCuts(); |
63 | fEsdTrackCuts->SetPtRange(0.15,1e3); | |
64 | } | |
65 | } | |
66 | ||
67 | //________________________________________________________________________ | |
68 | void AliEmcalEsdTpcTrackTask::UserExec(Option_t *) | |
69 | { | |
70 | // Main loop, called for each event. | |
71 | ||
72 | fEsdEv = dynamic_cast<AliESDEvent*>(InputEvent()); | |
73 | if (!fEsdEv) { | |
74 | AliError("Task works only on ESD events, returning"); | |
75 | return; | |
76 | } | |
77 | ||
78 | AliAnalysisManager *am = AliAnalysisManager::GetAnalysisManager(); | |
79 | if (!am) { | |
80 | AliError("Manager zero, returning"); | |
81 | return; | |
82 | } | |
83 | ||
84 | // add tracks to event if not yet there | |
85 | if (!(InputEvent()->FindListObject(fTracksName))) | |
86 | InputEvent()->AddObject(fTracks); | |
87 | ||
dd5a823e | 88 | if (!fHybridTrackCuts) { // contrain TPC tracks to SPD vertex if fDoSpdVtxCon==kTRUE |
57184cc6 | 89 | am->LoadBranch("AliESDRun."); |
90 | am->LoadBranch("AliESDHeader."); | |
57184cc6 | 91 | am->LoadBranch("Tracks"); |
4d1e3842 | 92 | |
93 | if (fDoSpdVtxCon) { | |
94 | if (!TGeoGlobalMagField::Instance()->GetField()) { // construct field map | |
95 | fEsdEv->InitMagneticField(); | |
57184cc6 | 96 | } |
4d1e3842 | 97 | am->LoadBranch("SPDVertex."); |
98 | const AliESDVertex *vtxSPD = fEsdEv->GetPrimaryVertexSPD(); | |
99 | if (!vtxSPD) { | |
100 | AliError("No SPD vertex, returning"); | |
101 | return; | |
57184cc6 | 102 | } |
4d1e3842 | 103 | Int_t ntr = fEsdEv->GetNumberOfTracks(); |
104 | for (Int_t i=0, ntrnew=0; i<ntr; ++i) { | |
105 | AliESDtrack *etrack = fEsdEv->GetTrack(i); | |
106 | if (!etrack) | |
107 | continue; | |
108 | if (!fEsdTrackCuts->AcceptTrack(etrack)) | |
109 | continue; | |
110 | AliESDtrack *ntrack = AliESDtrackCuts::GetTPCOnlyTrack(fEsdEv,etrack->GetID()); | |
111 | if (!ntrack) | |
112 | continue; | |
113 | if (ntrack->Pt()<=0) { | |
114 | delete ntrack; | |
115 | continue; | |
116 | } | |
117 | Double_t bfield[3] = {0,0,0}; | |
118 | ntrack->GetBxByBz(bfield); | |
119 | AliExternalTrackParam exParam; | |
120 | Bool_t relate = ntrack->RelateToVertexBxByBz(vtxSPD,bfield,kVeryBig,&exParam); | |
121 | if (!relate) { | |
122 | delete ntrack; | |
123 | continue; | |
124 | } | |
125 | // set the constraint parameters to the track | |
126 | ntrack->Set(exParam.GetX(),exParam.GetAlpha(),exParam.GetParameter(),exParam.GetCovariance()); | |
127 | if (ntrack->Pt()<=0) { | |
128 | delete ntrack; | |
129 | continue; | |
130 | } | |
131 | new ((*fTracks)[ntrnew++]) AliESDtrack(*ntrack); | |
57184cc6 | 132 | delete ntrack; |
57184cc6 | 133 | } |
4d1e3842 | 134 | } else { /* no spd vtx constraint */ |
135 | Int_t ntr = fEsdEv->GetNumberOfTracks(); | |
136 | for (Int_t i=0, ntrnew=0; i<ntr; ++i) { | |
137 | AliESDtrack *etrack = fEsdEv->GetTrack(i); | |
138 | if (!etrack) | |
139 | continue; | |
140 | if (!fEsdTrackCuts->AcceptTrack(etrack)) | |
141 | continue; | |
142 | new ((*fTracks)[ntrnew++]) AliESDtrack(*etrack); | |
143 | } | |
cc2b5fb5 | 144 | } |
145 | ||
10d1f756 | 146 | } else { // use hybrid track cuts |
57184cc6 | 147 | |
148 | am->LoadBranch("Tracks"); | |
149 | Int_t ntr = fEsdEv->GetNumberOfTracks(); | |
150 | for (Int_t i=0, ntrnew=0; i<ntr; ++i) { | |
151 | AliESDtrack *etrack = fEsdEv->GetTrack(i); | |
152 | if (!etrack) | |
153 | continue; | |
154 | if (fEsdTrackCuts->AcceptTrack(etrack)) { | |
155 | new ((*fTracks)[ntrnew]) AliESDtrack(*etrack); | |
156 | AliESDtrack *newTrack = static_cast<AliESDtrack*>(fTracks->At(ntrnew)); | |
157 | newTrack->SetLabel(0); | |
158 | ++ntrnew; | |
159 | } else if (fHybridTrackCuts->AcceptTrack(etrack)) { | |
160 | if (etrack->GetConstrainedParam()) { | |
161 | new ((*fTracks)[ntrnew]) AliESDtrack(*etrack); | |
162 | AliESDtrack *newTrack = static_cast<AliESDtrack*>(fTracks->At(ntrnew)); | |
163 | ++ntrnew; | |
164 | const AliExternalTrackParam* constrainParam = etrack->GetConstrainedParam(); | |
165 | newTrack->Set(constrainParam->GetX(), | |
166 | constrainParam->GetAlpha(), | |
167 | constrainParam->GetParameter(), | |
168 | constrainParam->GetCovariance()); | |
169 | UInt_t status = etrack->GetStatus(); | |
170 | if ((status&AliESDtrack::kITSrefit)==0) | |
171 | newTrack->SetLabel(2); | |
172 | else | |
173 | newTrack->SetLabel(1); | |
174 | } | |
175 | } | |
176 | } | |
cc2b5fb5 | 177 | } |
178 | } |