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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

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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


Met trigger1

MET Trigger


Met trigger2

MET Trigger


Met slides

  • 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


Met slides

  • 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?


Met slides

  • 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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