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MET Slides. Xiaowen Lei (U. Arizona). MET Triggers. MET triggers can be important supplementary triggers for ATLAS physics L1 rate can be reduced by combining multiple L1 objects Jet + X - 2j40_xe30 Tau + X - tau16i_loose_EFxe30 e + X - g25_loose_xe30

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met slides

MET Slides

Xiaowen Lei

(U. Arizona)

met triggers
MET Triggers
  • MET triggers can be important supplementary triggers for ATLAS physics
    • L1 rate can be reduced by combining multiple L1 objects
      • Jet + X - 2j40_xe30
      • Tau + X - tau16i_loose_EFxe30
      • e + X - g25_loose_xe30
  • Of course before one can use these triggers the basic xe triggers must be commissioned and understood
met trigger
MET Trigger
  • L1 xe
    • L1 Calo trigger produces MET, Scalar ET and Scaler ET (sum over jets)
    • For each there are 8, 4 and 4 thresholds
  • L2 xe
    • L1 Calo MET but corrected using L2 Muon
  • EF xe
    • All calorimeter cells, all cells with noise suppression or FEB based
    • Can be corrected for EF muons
slide11

3 menus to consider

  • Cosmic menu right before initial beam
  • Initial beam menu
  • Physics menu (more speculative)
cosmic menu 2009v2
Cosmic menu 2009v2
  • L1
  • L1_XE[20, 30, 50, 60]_EMPTY XEx L1_TE[150, 650]_EMPTY TEx L1_JE[120, 340]_EMPTY JEx
cosmic menu 2009v21
Cosmic menu 2009v2
  • Hlt request
  • xe30 xe30_FEB xe30_noiseSupp xe30_allL1 xe30_allL1_FEB xe30_allL1_noiseSupp te150 xe30_unbiased xe30_unbiased_FEB xe30_unbiased_noiseSupp xe20_EFonly_L1MBTS1 xe20_EFonly_L1MBTS1_FEB xe20_EFonly_L1MBTS1_noiseSupp
initialbeam v1
InitialBeam_v1
  • L1
  • Identical to comic2009_v2 except the l1 terms have ANDed with "BGRP0 & (BPTX0 | BPTX1)"
  • L1_XE20, 30, 50, 60 XEx L1_TE150, 650 TEx L1_JE120, 340 JEx
initialbeam v11
InitialBeam_v1
  • HLT
  • Same as cosmic2009 plus the standard physics chains
rates
rates
  • L1 XE Rates
  • Trigger NamePrescaleRateCumul Rate L1_XE50 2 0.67 (+/- 0.27 ) 0.67 L1_XE40 20 0.48 (+/- 0.07 ) 1.12 L1_XE30 200 0.65 (+/- 0.03 ) 1.76 L1_XE25 1500 0.33 (+/- 0.01 ) 2.09 L1_XE20 7000 0.24 (+/- 0.00 ) 2.33 L1_XE15 30000 0.18 (+/- 0.00 ) 2.51 L1_XE60 1 0.22 (+/- 0.22 ) 2.62 L1_XE35 100 0.35 (+/- 0.03 ) 2.96 Total Rate2.96
rates1
rates
  • Trigger NamePrescaleRateCumul Rate L1_XE50 2 0.67 (+/- 0.27 ) 0.67 L1_XE40 20 0.48 (+/- 0.07 ) 1.12 L1_XE30 200 0.65 (+/- 0.03 ) 1.76 L1_XE25 1500 0.33 (+/- 0.01 ) 2.09 L1_XE20 7000 0.24 (+/- 0.00 ) 2.33 L1_XE15 30000 0.18 (+/- 0.00 ) 2.51 L1_XE60 1 0.22 (+/- 0.22 ) 2.62 L1_XE35 100 0.35 (+/- 0.03 ) 2.96 Total Rate2.96
trigger efficiencies
Trigger efficiencies
  • We calculate trigger efficiencies as part of the HLT MET monitoring package and MET performance package
  • Wrt offline MET (calorimeter only for now)
  • Useful data samples will be 2 jets, z to tau tau, w to enu and ttbar
slide23

At startup will use L1 only with HLT in passthrough

  • Quickly move to enable HLT to given needed rejection with increasing luminosity
  • Use l1 to reduce bulk of rate and ef to sharpen the turnon
  • Monitor efficiency using special chains?
slide24

8 met thresholds must seed

    • Inclusive met and met w muon correction triggers
    • MET plus jet and MET plus lepton triggers
    • Are jet triggers inclus
    • ive or exclusive?
    • Examples of turnon curves
    • Trigger menu from diego slide
    • L31 trigger menu twiki
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