-- MarcelFigueredo - 02-Nov-2011

HLT mode C - LHC11f

We have been studying some runs from LHC11f which contains the EMCALClusterEnergy and the EMCAL-HLT inside the ESD-offline reconstruction. The purposes of these studies is to extract the efficiency of the trigger decision by the HLT trigger and also study the how good is the EMCAL reconstruction.

November 9, 2011

1 - Run 164725: Comparison of previous results with offline rec and latest OCDB

Since we had conjectured that the problem of the weird behavior with the HLT-rec could come from the OCDB information used, we tried to do the HLT reconstruction off-line using the latest OCDB available.

Figure 1.1 - Cluster Energy HLT, HLT(latest OCDB) and ESD


From the comparison above, the problem does not seem to be related to the OCDB used. We need to go further into this problem, in order to find a reason for that.

Run 164725 (Ecluster Threshold =2 GeV)

Dumping the information of the HLT decision in 11000164725001.10.root, it was realized that most of the events have trigger decision=1, but the ESDoffline Emax>2 did not correspond to the same amount of events.

1 - Cluster distributions: Energy, Eta and Phi

For this purpose, some jobs were submitted to the GRID, using AliESDInputHandler:GetHLTEvent(), so that one could look into both HLT and ESD event (examples are provided attached to this page).

Around 136.9 k Events were analyzed.

Figure 1.1 - Cluster Energy HLT and ESD

Figure 1.2 - Cluster Eta x PHi x Energy for ESD reconstruction

Figure 1.3 - Cluster Eta x PHi x Energy for ESD reconstruction

2 - Preliminary Conclusions

For this specific run, there are lots of possible bad cluster that should be verified into more details. These clusters probably fire the HLT-trigger too much.

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formatcxx AliAnalysisTaskESD_HLT.cxx r1 manage 5.1 K 2011-11-02 - 13:56 Marcelfigueredo  
Header fileh AliAnalysisTaskESD_HLT.h r1 manage 1.5 K 2011-11-02 - 13:56 Marcelfigueredo  
C source code filec CreateAlienHandler.C r1 manage 5.6 K 2011-11-02 - 13:56 Marcelfigueredo  
GIFgif HLTcomparison.gif r1 manage 24.8 K 2011-11-09 - 13:04 Marcelfigueredo  
GIFgif HLTreccomparison.gif r1 manage 23.2 K 2011-11-09 - 12:58 Marcelfigueredo  
GIFgif clusterenergy.gif r1 manage 21.1 K 2011-11-02 - 13:57 Marcelfigueredo  
GIFgif eta_phi_ESD.gif r1 manage 72.1 K 2011-11-02 - 13:57 Marcelfigueredo  
GIFgif eta_phi_HLT.gif r1 manage 82.4 K 2011-11-02 - 13:58 Marcelfigueredo  
C source code filec runGrid.C r1 manage 5.3 K 2011-11-02 - 13:56 Marcelfigueredo  
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Topic revision: r3 - 2011-11-23 - Marcelfigueredo
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