-- MarcelFigueredo - 12-Apr-2012

General information

~ 1.2 M events (EMC-L1-Gamma trigger) ~ 1M after event selection = vertex<10cm. Both values above need to be carefully checked.

General cuts

if(TMath::Abs(track->Eta())>0.8)return kFALSE;  // To make things safe
if(track->Phi()<1.0||track->Phi()>4.)return kFALSE; // To make things safe
Int_t ClsId = track->GetEMCALcluster();
if(ClsId == -1) return kFALSE;
AliESDCaloCluster *cluster = esdE->GetCaloCluster(ClsId);
if(!cluster->IsEMCAL())return kFALSE;
Double_t dEta=cluster->GetTrackDz();
Double_t dPhi=cluster->GetTrackDx();
if(TMath::Abs(dEta)>0.02)return kFALSE; // To make things safe
if(TMath::Abs(dPhi)>0.05)return kFALSE; // To make things safe

AddCut(AliDielectronVarManager::kTPCsignal,68.,120.); // from prior analysis
esdTrackCuts->SetMaxDCAToVertexZ(3.0);
esdTrackCuts->SetMaxDCAToVertexXY(1.0);
esdTrackCuts->SetEtaRange( -0.9 , 0.9 );
esdTrackCuts->SetAcceptKinkDaughters(kFALSE);
esdTrackCuts->SetRequireITSRefit(kTRUE);
esdTrackCuts->SetRequireTPCRefit(kTRUE);
esdTrackCuts->SetPtRange(1.,1e30);
esdTrackCuts->SetMinNClustersTPC(70);
esdTrackCuts->SetMaxChi2PerClusterTPC(4);
  // default SPD any
esdTrackCuts->SetClusterRequirementITS(AliESDtrackCuts::kSPD,AliESDtrackCuts::kAny);

Results

Centrality distribution

Invariant Mass

1 - Centrality 0-80, Ecluster >6 GeV, OpenAngle<6.,ptpair>7GeV

Figure 1(a) - Inv.Mass pair{+-} Figure 1(b) - Inv.Mass pair{++and--}
hMass_6_7_80_6.gif;rev=1 hMassB_6_7_80_6.gif;rev=1
Figure 1(c) - Inv.Mass pair{+-} and {++and--}
hMass_6_7_80_6Same.gif;rev=1

2 - Centrality 0-80, Ecluster >6 GeV, OpenAngle<2.,ptpair>7GeV

Figure 2(a) - Inv.Mass pair{+-} Figure 2(b) - Inv.Mass pair{++and--}
hMass_6_7_80_2.gif;rev=1 hMassB_6_7_80_2.gif;rev=1
Figure 2(c) - Inv.Mass pair{+-} and {++and--}
hMass_6_7_80_2Same.gif;rev=1

3 - Centrality 0-80, Ecluster >6 GeV, OpenAngle<1.,ptpair>7GeV

Figure 3(a) - Inv.Mass pair{+-} Figure 3(b) - Inv.Mass pair{++and--}
hMass_6_7_80_1.gif;rev=1 hMassB_6_7_80_1.gif;rev=1
Figure 3(c) - Inv.Mass pair{+-} and {++and--}
hMass_6_7_80_1Same.gif;rev=1

4 - Centrality 0-20, Ecluster >6 GeV, OpenAngle<6.,ptpair>7GeV

Figure 4(a) - Inv.Mass pair{+-} Figure 4(b) - Inv.Mass pair{++and--}
hMass_6_7_20_6.gif;rev=1 hMassB_6_7_20_6.gif;rev=1
Figure 4(c) - Inv.Mass pair{+-} and {++and--}
hMass_6_7_20_6Same.gif;rev=1

5 - Centrality 0-20, Ecluster >6 GeV, OpenAngle<2.,ptpair>7GeV

Figure 5(a) - Inv.Mass pair{+-} Figure 5(b) - Inv.Mass pair{++and--}
hMass_6_7_20_2.gif;rev=1 hMassB_6_7_20_2.gif;rev=1
Figure 5(c) - Inv.Mass pair{+-} and {++and--}
hMass_6_7_20_2Same.gif;rev=1

6 - Centrality 0-20, Ecluster >6 GeV, OpenAngle<1.,ptpair>7GeV

Figure 6(a) - Inv.Mass pair{+-} Figure 6(b) - Inv.Mass pair{++and--}
hMass_6_7_20_1.gif;rev=1 hMassB_6_7_20_1.gif;rev=1
Figure 6(c) - Inv.Mass pair{+-} and {++and--}
hMass_6_7_20_1Same.gif;rev=1

Preliminary conclusion

Imposing cut on ptpair and Ecluster,(an also opening angle), there is some slight evidence of peak. More statistics and better methods for background subtraction might improve the analysiis
Topic attachments
I Attachment History Action Size Date Who Comment
GIFgif hMassB_6_7_20_1.gif r1 manage 27.9 K 2012-04-13 - 04:16 Marcelfigueredo  
GIFgif hMassB_6_7_20_2.gif r1 manage 32.6 K 2012-04-13 - 04:02 Marcelfigueredo  
GIFgif hMassB_6_7_20_6.gif r1 manage 32.7 K 2012-04-13 - 03:45 Marcelfigueredo  
GIFgif hMassB_6_7_80_1.gif r1 manage 27.5 K 2012-04-13 - 04:12 Marcelfigueredo  
GIFgif hMassB_6_7_80_2.gif r1 manage 32.6 K 2012-04-13 - 04:09 Marcelfigueredo  
GIFgif hMassB_6_7_80_6.gif r1 manage 32.9 K 2012-04-13 - 04:09 Marcelfigueredo  
GIFgif hMassS_6_7_20_6.gif r1 manage 27.1 K 2012-04-13 - 03:48 Marcelfigueredo  
GIFgif hMass_6_7_20_1Same.gif r1 manage 31.9 K 2012-04-13 - 04:16 Marcelfigueredo  
GIFgif hMass_6_7_20_2.gif r1 manage 31.2 K 2012-04-13 - 04:02 Marcelfigueredo  
GIFgif hMass_6_7_20_2Same.gif r1 manage 40.0 K 2012-04-13 - 04:02 Marcelfigueredo  
GIFgif hMass_6_7_20_6.gif r1 manage 31.4 K 2012-04-13 - 03:45 Marcelfigueredo  
GIFgif hMass_6_7_20_6Same.gif r1 manage 39.9 K 2012-04-13 - 03:45 Marcelfigueredo  
GIFgif hMass_6_7_80_1.gif r1 manage 28.0 K 2012-04-13 - 04:12 Marcelfigueredo  
GIFgif hMass_6_7_80_1Same.gif r1 manage 33.9 K 2012-04-13 - 04:12 Marcelfigueredo  
GIFgif hMass_6_7_80_2.gif r1 manage 31.1 K 2012-04-13 - 04:09 Marcelfigueredo  
GIFgif hMass_6_7_80_2Same.gif r1 manage 39.8 K 2012-04-13 - 04:09 Marcelfigueredo  
GIFgif hMass_6_7_80_6.gif r1 manage 31.2 K 2012-04-13 - 04:09 Marcelfigueredo  
GIFgif hMass_6_7_80_6Same.gif r1 manage 39.9 K 2012-04-13 - 04:09 Marcelfigueredo  
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Topic revision: r2 - 2012-04-13 - Marcelfigueredo
 
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