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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 | // |
cd231d42 | 5 | // Author: C.Loizides |
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() : | |
27fde6c7 | 19 | AliAnalysisTaskSE("TpcSpdVertexConstrainedTracks"), |
cc2b5fb5 | 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. |
27fde6c7 | 41 | |
42 | if (!name) | |
43 | return; | |
44 | ||
45 | SetName(name); | |
46 | ||
a93ef37c | 47 | fBranchNames = "ESD:AliESDHeader.,AliESDRun.,SPDVertex.,Tracks"; |
cc2b5fb5 | 48 | } |
49 | ||
50 | //________________________________________________________________________ | |
51 | AliEmcalEsdTpcTrackTask::~AliEmcalEsdTpcTrackTask() | |
52 | { | |
53 | //Destructor | |
54 | ||
55 | delete fEsdTrackCuts; | |
56 | } | |
57 | ||
58 | //________________________________________________________________________ | |
59 | void AliEmcalEsdTpcTrackTask::UserCreateOutputObjects() | |
60 | { | |
a93ef37c | 61 | // Create histograms. |
cc2b5fb5 | 62 | |
63 | fTracks = new TClonesArray("AliESDtrack"); | |
64 | fTracks->SetName(fTracksName); | |
65 | ||
66 | if (!fEsdTrackCuts) { | |
dd5a823e | 67 | AliInfo("No track cuts given, creating default (standard only TPC) cuts"); |
cc2b5fb5 | 68 | fEsdTrackCuts = AliESDtrackCuts::GetStandardTPCOnlyTrackCuts(); |
69 | fEsdTrackCuts->SetPtRange(0.15,1e3); | |
70 | } | |
71 | } | |
72 | ||
73 | //________________________________________________________________________ | |
74 | void AliEmcalEsdTpcTrackTask::UserExec(Option_t *) | |
75 | { | |
76 | // Main loop, called for each event. | |
77 | ||
78 | fEsdEv = dynamic_cast<AliESDEvent*>(InputEvent()); | |
79 | if (!fEsdEv) { | |
80 | AliError("Task works only on ESD events, returning"); | |
81 | return; | |
82 | } | |
83 | ||
84 | AliAnalysisManager *am = AliAnalysisManager::GetAnalysisManager(); | |
85 | if (!am) { | |
86 | AliError("Manager zero, returning"); | |
87 | return; | |
88 | } | |
89 | ||
90 | // add tracks to event if not yet there | |
91 | if (!(InputEvent()->FindListObject(fTracksName))) | |
92 | InputEvent()->AddObject(fTracks); | |
93 | ||
dd5a823e | 94 | if (!fHybridTrackCuts) { // contrain TPC tracks to SPD vertex if fDoSpdVtxCon==kTRUE |
57184cc6 | 95 | am->LoadBranch("AliESDRun."); |
96 | am->LoadBranch("AliESDHeader."); | |
57184cc6 | 97 | am->LoadBranch("Tracks"); |
4d1e3842 | 98 | |
99 | if (fDoSpdVtxCon) { | |
100 | if (!TGeoGlobalMagField::Instance()->GetField()) { // construct field map | |
101 | fEsdEv->InitMagneticField(); | |
57184cc6 | 102 | } |
4d1e3842 | 103 | am->LoadBranch("SPDVertex."); |
104 | const AliESDVertex *vtxSPD = fEsdEv->GetPrimaryVertexSPD(); | |
105 | if (!vtxSPD) { | |
106 | AliError("No SPD vertex, returning"); | |
107 | return; | |
57184cc6 | 108 | } |
4d1e3842 | 109 | Int_t ntr = fEsdEv->GetNumberOfTracks(); |
110 | for (Int_t i=0, ntrnew=0; i<ntr; ++i) { | |
111 | AliESDtrack *etrack = fEsdEv->GetTrack(i); | |
112 | if (!etrack) | |
113 | continue; | |
114 | if (!fEsdTrackCuts->AcceptTrack(etrack)) | |
115 | continue; | |
116 | AliESDtrack *ntrack = AliESDtrackCuts::GetTPCOnlyTrack(fEsdEv,etrack->GetID()); | |
117 | if (!ntrack) | |
118 | continue; | |
119 | if (ntrack->Pt()<=0) { | |
120 | delete ntrack; | |
121 | continue; | |
122 | } | |
123 | Double_t bfield[3] = {0,0,0}; | |
124 | ntrack->GetBxByBz(bfield); | |
125 | AliExternalTrackParam exParam; | |
126 | Bool_t relate = ntrack->RelateToVertexBxByBz(vtxSPD,bfield,kVeryBig,&exParam); | |
127 | if (!relate) { | |
128 | delete ntrack; | |
129 | continue; | |
130 | } | |
131 | // set the constraint parameters to the track | |
132 | ntrack->Set(exParam.GetX(),exParam.GetAlpha(),exParam.GetParameter(),exParam.GetCovariance()); | |
133 | if (ntrack->Pt()<=0) { | |
134 | delete ntrack; | |
135 | continue; | |
136 | } | |
137 | new ((*fTracks)[ntrnew++]) AliESDtrack(*ntrack); | |
57184cc6 | 138 | delete ntrack; |
57184cc6 | 139 | } |
4d1e3842 | 140 | } else { /* no spd vtx constraint */ |
141 | Int_t ntr = fEsdEv->GetNumberOfTracks(); | |
142 | for (Int_t i=0, ntrnew=0; i<ntr; ++i) { | |
143 | AliESDtrack *etrack = fEsdEv->GetTrack(i); | |
144 | if (!etrack) | |
145 | continue; | |
146 | if (!fEsdTrackCuts->AcceptTrack(etrack)) | |
147 | continue; | |
148 | new ((*fTracks)[ntrnew++]) AliESDtrack(*etrack); | |
149 | } | |
cc2b5fb5 | 150 | } |
151 | ||
10d1f756 | 152 | } else { // use hybrid track cuts |
57184cc6 | 153 | |
154 | am->LoadBranch("Tracks"); | |
155 | Int_t ntr = fEsdEv->GetNumberOfTracks(); | |
156 | for (Int_t i=0, ntrnew=0; i<ntr; ++i) { | |
157 | AliESDtrack *etrack = fEsdEv->GetTrack(i); | |
158 | if (!etrack) | |
159 | continue; | |
160 | if (fEsdTrackCuts->AcceptTrack(etrack)) { | |
161 | new ((*fTracks)[ntrnew]) AliESDtrack(*etrack); | |
162 | AliESDtrack *newTrack = static_cast<AliESDtrack*>(fTracks->At(ntrnew)); | |
163 | newTrack->SetLabel(0); | |
164 | ++ntrnew; | |
165 | } else if (fHybridTrackCuts->AcceptTrack(etrack)) { | |
166 | if (etrack->GetConstrainedParam()) { | |
167 | new ((*fTracks)[ntrnew]) AliESDtrack(*etrack); | |
168 | AliESDtrack *newTrack = static_cast<AliESDtrack*>(fTracks->At(ntrnew)); | |
169 | ++ntrnew; | |
170 | const AliExternalTrackParam* constrainParam = etrack->GetConstrainedParam(); | |
171 | newTrack->Set(constrainParam->GetX(), | |
172 | constrainParam->GetAlpha(), | |
173 | constrainParam->GetParameter(), | |
174 | constrainParam->GetCovariance()); | |
175 | UInt_t status = etrack->GetStatus(); | |
176 | if ((status&AliESDtrack::kITSrefit)==0) | |
177 | newTrack->SetLabel(2); | |
178 | else | |
179 | newTrack->SetLabel(1); | |
180 | } | |
181 | } | |
182 | } | |
cc2b5fb5 | 183 | } |
184 | } |