General information

Data used

LHC11h(pass2)
AliROOT →v5-03-22-AN 
run_numbers[59]={167807,167808,167813,167818,167915,167920,167921,167987,167988,168069,168076,168105,168107,168108,168115,168173,168175,168181,168206,168213,168310,168311,168318,168322,168325,168341,168342,168356,168361,168362,168460,168464,168467,168511,168512,168514,168777,168826,168988,168992,169035,169091,169094,169411,169415,169417,169550,169588,169835,169837,169838,169846,169855,169858,170040,170081,170228,170268,170387};
AODs from AOD095

General cuts

Event Cuts:

   |vertexZ|<10cm
   |Centrality|<80%

Track Cuts:

   trackCuts->SetClusterRequirementITS(AliESDtrackCuts::kSPD,AliESDtrackCuts::kAny);
   trackCuts->SetRequireTPCRefit(kTRUE);
   trackCuts->SetRequireITSRefit(kTRUE);

  AliDielectronVarCuts *pt = new AliDielectronVarCuts("ptCut","pt cut");
  pt->AddCut(AliDielectronVarManager::kPt,1.,1e30);
  pt->AddCut(AliDielectronVarManager::kKinkIndex0,0.);
  //AOD additions since there are no AliESDtrackCuts -----------------
  pt->AddCut(AliDielectronVarManager::kEta,-0.9,0.9);
  pt->AddCut(AliDielectronVarManager::kImpactParXY, -1.0,   1.0);
  pt->AddCut(AliDielectronVarManager::kImpactParZ,  -3.0,   3.0); 

Event Selection (Gamma trigger EMC)

 N Events(0-10):359730
 N Events(0-20):709530
 N Events(0-40):1338065
 N Events(0-80):1832365
 N Events(40-80):520737 

The centrality distribution is shown below:

Figure (a) - Centrality	Figure (b) - Centrality in log scale

Figure (c) - Vertex Z

Results

0 - EMCal NSigma for Electrons

The distribution TPC-dEdx x NsigmaElectronsEMCal can be seen below

Figure (c) - dEdx x NsigmaEMCal

Figure (a) - Centrality	Figure (b) - Centrality in log scale

1 - Both EMCal Electron

For The EMCal PID, it was considered a cut |nsigmaEMCal|<3.

SPD Any Centrality(0-80)

Figure 1(a) - Inv.Mass pair{+-}	Figure 1(b) - Inv.Mass pair{+-} and {++and--}

For this case, I also projected the pt for Invariant mass in the range 2.9<M<3.2 GeV/c².

Figure 1(c) - - Pt Pair invariant mass cut = 2.9<M<3.2 GeV/c²	Figure 1(d) - Pt Pair invariant mass cut = 2.9<M<3.2 GeV/c² (zoom in pt<10 GeV/c)}

SPD Any Centrality(0-40)

Figure 1(e) - Inv.Mass pair{+-}	Figure 1(f) - Inv.Mass pair{+-} and {++and--}

SPD Any Centrality(0-20)

Figure 1(g) - Inv.Mass pair{+-}	Figure 1(h) - Inv.Mass pair{+-} and {++and--}

2 - Both TPC Electron

SPD Any Centrality(0-80)

Figure 2(a) - Inv.Mass pair{+-}	Figure 2(b) - Inv.Mass pair{+-} and {++and--}

SPD Any Centrality(0-40)

Figure 2(c) - Inv.Mass pair{+-}	Figure 2(d) - Inv.Mass pair{+-} and {++and--}

-- MarcelFigueredo - 22-May-2012