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[u/mrichter/AliRoot.git] / PWG2 / RESONANCES / AliRsnCutPrimaryVertex.cxx
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96ab9736 1//
2// Class AliRsnCutPrimaryVertex
3//
ceaa78d3 4// This cut implementation checks the quality of event primary vertex.
5// It currently works only with ESD events (not AOD).
96ab9736 6//
7// authors: Martin Vala (martin.vala@cern.ch)
8// Alberto Pulvirenti (alberto.pulvirenti@ct.infn.it)
9//
96ab9736 10
96ab9736 11#include "AliRsnCutPrimaryVertex.h"
12
13ClassImp(AliRsnCutPrimaryVertex)
14
15//_________________________________________________________________________________________________
96ab9736 16AliRsnCutPrimaryVertex::AliRsnCutPrimaryVertex
02e8aa99 17(const char *name, Double_t maxVz, Int_t nContributors, Bool_t acceptTPC) :
2a1c7696 18 AliRsnCut(name, AliRsnCut::kEvent, 0, nContributors - 1, 0.0, maxVz),
19 fAcceptTPC(acceptTPC),
20 fCheckPileUp(kFALSE)
96ab9736 21{
22//
23// Main constructor.
ceaa78d3 24// Defines the cut range between 0 and
25// the minimum required number of contributors.
26// The cut will be passed when if the event has a
27// primary vertex with number of contributors outside this interval.
28// ---
29// If the 'acceptTPC' argument is true, events with TPC
30// primary vertex will be checked, otherwise they will be
31// rejected by default.
32// ---
33// Since the range check uses the '>=' and '<=', the high edge
34// must be decreased by 1 to get the right behaviour, since this is integer.
96ab9736 35//
02e8aa99 36
2a1c7696 37 fMinD = 0.0;
38 fMaxD = maxVz + 1E-6;
96ab9736 39}
40
41//_________________________________________________________________________________________________
32992791 42Bool_t AliRsnCutPrimaryVertex::IsSelected(TObject *object)
96ab9736 43{
44//
45// Cut checker
46//
2a1c7696 47
48 // retrieve ESD event
49 AliRsnEvent *rsn = dynamic_cast<AliRsnEvent*>(object);
50 if (!rsn) return kFALSE;
51 AliESDEvent *esd = rsn->GetRefESD();
52 AliAODEvent *aod = rsn->GetRefAOD();
53
54 if (esd) {
55 // pile-up check
56 if (fCheckPileUp) {
57 if (esd->IsPileupFromSPD()) return kFALSE;
5faf5a07 58 }
2a1c7696 59
60 // get the best primary vertex:
61 // first try the one with tracks
62 const AliESDVertex *vTrk = esd->GetPrimaryVertexTracks();
63 const AliESDVertex *vSPD = esd->GetPrimaryVertexSPD();
64 const AliESDVertex *vTPC = esd->GetPrimaryVertexTPC();
65 Int_t ncTrk = -1;
66 Int_t ncSPD = -1;
67 Int_t ncTPC = -1;
68 Double_t vzTrk = 1000000.0;
69 Double_t vzSPD = 1000000.0;
70 Double_t vzTPC = 1000000.0;
71 if (vTrk) vzTrk = TMath::Abs(vTrk->GetZv());
72 if (vSPD) vzSPD = TMath::Abs(vSPD->GetZv());
73 if (vTPC) vzTPC = TMath::Abs(vTPC->GetZv());
74 if (vTrk) ncTrk = (Int_t)vTrk->GetNContributors();
75 if (vSPD) ncSPD = (Int_t)vSPD->GetNContributors();
76 if (vTPC) ncTPC = (Int_t)vTPC->GetNContributors();
77 if (vTrk && ncTrk > 0) {
78 fCutValueI = ncTrk;
79 fCutValueD = vzTrk;
80 } else if (vSPD && ncSPD > 0) {
81 fCutValueI = ncSPD;
82 fCutValueD = vzSPD;
83 } else if (vTPC && ncTPC > 0) {
84 if (!fAcceptTPC)
85 return kFALSE;
86 else {
87 fCutValueI = ncTPC;
88 fCutValueD = vzTPC;
89 }
90 } else
91 return kFALSE;
92 } else if (aod) {
93 // pile-up check is not yet available for AODs
94
95 // lines suggested by Andrea to reject TPC-only events
96 if (!fAcceptTPC) {
97 if (!aod->GetPrimaryVertexSPD()) return kFALSE;
98 else if (aod->GetPrimaryVertexSPD()->GetNContributors() < 1) return kFALSE;
99 }
100
101 AliAODVertex *prim = (AliAODVertex*)aod->GetPrimaryVertex();
102 if (!prim) return kFALSE;
103
104 fCutValueI = prim->GetNContributors();
105 fCutValueD = prim->GetZ();
106 } else
5faf5a07 107 return kFALSE;
a378358c 108
2a1c7696 109 // output
110 Bool_t result = ((!OkRangeI()) && OkRangeD());
111 return result;
96ab9736 112}
aa24e021 113
114//_________________________________________________________________________________________________
115void AliRsnCutPrimaryVertex::Print(const Option_t *) const
116{
117//
118// Print information on this cut
119//
120
2a1c7696 121 AliInfo(Form("Cut name : %s", GetName()));
122 AliInfo(Form("Accepting TPC primary vertex : %s", (fAcceptTPC ? "YES" : "NO")));
123 AliInfo(Form("Contributors range (outside) : %d - %d", fMinI, fMaxI));
124 AliInfo(Form("Z-vertex range (inside) : %f - %f", fMinD, fMaxD));
aa24e021 125}