TRT HT middle bit tuning


Middle bit of TRT high threshold bits can be used to reduce TRT occupancy under higher instantaneous luminosity condition during Run 2. Since high threshold bit pattern distribution is not modeled well in simulation (specifically digitization), HT middle bit fraction is lower in MC about 3 - 10% depending on the TRT parts.


Since HT variables are sensitive to pile-up, low <mu> data (<mu>~6) was selected for the study. Although HT bit pattern distribution of electron and muon is very similar, we studied both electron and muon for completeness.

  • Data
    • data11_7TeV.periodD.physics_Egamma.PhysCont.DESD_SGLEL.repro09_v01/
    • data11_7TeV.periodG.physics_Egamma.PhysCont.DESD_SGLEL.repro09_v01/
    • data11_7TeV.periodI.physics_Egamma.PhysCont.DESD_SGLEL.repro09_v01/
  • MC
    • J/ψ → μμ sample
      • mc11_7TeV.108494.Pythia_directJpsimu2p5mu2p5.merge.HITS.e835_s1310_s1300/
    • Z → ee sample
      • mc11_7TeV.147770.Sherpa_CT10_Zee.merge.HITS.e1443_s1372_s1370/


Athena software releases to process data and MC are different since data was processed with old release and MC has to be reprocessed with various TRT digitizations.

  • for data
  • for MC


There are two TRT_Digitization tags which are related to the study.

  • TRT_Digitization-01-00-14
    • The baseline TRT digitization tag for tuning.
    • Tuning parameters are overrided in
  • TRT_Digitization-01-00-24

Tuning variables

-- KyungeonChoi - 2015-06-16

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Topic revision: r2 - 2015-06-17 - KyungeonChoi
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