L1Calo EM Efficiency Maps Hardeep Bansil University of Birmingham L1Calo Weekly Meeting 07/03/2011.

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Presentation transcript:

L1Calo EM Efficiency Maps Hardeep Bansil University of Birmingham L1Calo Weekly Meeting 07/03/2011

Contents Intro & Method Efficiency maps – Effects of different cuts Results Plans for

Efficiency Maps Efficiencies calculated for L1 electromagnetic trigger items as to determine L1Calo performance Calculated by using raw offline clusters of electrons and photons and matching them to EmTau RoIs Done as function of η and φ – efficiency map Also as a function of each data taking period (similar to most offline analyses) LAr OTX cuts can be applied Provides representation of the ability of individual trigger towers to ‘trigger’ Also identifies problem channels (dead/killed) and other regions to investigate 3

Method Using AthenaProduction Using JetTauEtmiss stream ESDs (reprocessed) Sample obtained with Jet Tag and Probe method – EM objects also reconstructed as jets so need to find another L1_J* RoI in the event (Δr > 0.4 away) so that they can be studied Raw cluster E T, η, φ using energy weighting of CaloCells that make up CaloCluster 4 Event studiedEvent ignored

A Typical Efficiency Map η-φ efficiency map for EM3 with OTX cuts for offline clusters with raw E T > 5 GeV Done in offline coordinates, φ shift from L1Calo coordinates With OTX cuts an area has 0 efficiency Channels with issues have low but not 0 efficiency 5 Transition Region

Identifying Issues – Period E η-φ efficiency map for EM3 with OTX cuts for offline clusters with raw E T > 5 GeV Areas with reduced efficiency are identified and problems (attempted to be) understood  most understood to some level, some not 6 Transition Region HV Problem Loose cable LAr miscabling Know L1Calo sees less energy, not sure why Dead tower Killed tower

Effect of LAr OTX cuts Faulty OTXs affect readout of analogue signal from calorimeter to DAQ – Where OTX problem is in second layer, eγ reconstruction poor and trigger tower efficiency drops – In other places, OTX cuts are conservative Will show plots from now on without OTX cuts 7 Without OTX CutsWith OTX cuts

Effect of Raw Cluster E T The higher the cluster energy becomes, the less sensitive the efficiency map is to regions with lower efficiency (≈80%) Mainly picks out dead/killed channels Higher E T will be important in future to identify areas with very low efficiency – Possible to use some intermediate cluster energy as well 8 Clus E T Raw > 10 GeVClus E T Raw > 5 GeV

Going from Period E … 9 η-φ map for EM3 for offline clusters with raw E T > 10 GeV

… to Period I 10 HV problems and loose cable have long since disappeared Dead/killed EM channels are the same, OTX probs are worse

Comparison with LevelOneCaloOfflineMappingTool 11 Used LevelOneCaloOfflineMappingTool for comparison Selected configurations that correspond to each period and plotted IsEmBadCalo() info Agrees very well – although maps will only show effects of OTX when the problem is in second layer of LAr calorimeter

Comparison with LevelOneCaloOfflineMappingTool 12 Used LevelOneCaloOfflineMappingTool for comparison Selected configurations that correspond to each period and plotted IsEmDead() info EmDeadChannels disagrees (database issue?) Green – show up for all periods in tool but not in maps Red – show up in all maps but not in tool until period H

How to make best use of these in 2011? Want maps to be able to support existing tools for analysis How often to run on data & where to store results – Possibility of producing these at Tier 0 – If done offline, should be able to run on DESD_CALJET files – Stick to running every period or every run if statistics are good OTX cuts or not + shall we analyse transition region again in 2011 Shift phi coordinate to L1Calo system rather than offline Maps for all trigger items and at what cluster energy Suggestions welcome! 13

Backup slides Efficiency Maps for Periods E-I + corresponding EM Dead Channel & Bad Calo (OTx) information from JM’s LevelOneCaloOfflineMappingTool 14

Period E , , , , , , , , , , , , , , , , , , , Bad Calo (OTX) EM Dead Channels Clus E T Raw > 5 GeV (EM3) Clus E T Raw > 10 GeV (EM3)

Period F 16 Bad Calo (OTX) EM Dead Channels Clus E T Raw > 5 GeV (EM3) , , , , , Clus E T Raw > 10 GeV (EM3)

Period G , , , , , , , , Bad Calo (OTX) EM Dead Channels Clus E T Raw > 5 GeV (EM3) Clus E T Raw > 10 GeV (EM3)

Period H , , , , Bad Calo (OTX) EM Dead Channels Clus E T Raw > 5 GeV (EM3) Clus E T Raw > 10 GeV (EM3)

Period I , , , Bad Calo (OTX) EM Dead Channels Clus E T Raw > 5 GeV (EM3) Clus E T Raw > 10 GeV (EM3)