MET SlidesXiaowen Lei(U. Arizona)

K. Johns

MET TriggersMET triggers can be important supplementary triggers for ATLAS physicsL1 rate can be reduced by combining multiple L1 objectsJet + X - 2j40_xe30Tau + X - tau16i_loose_EFxe30e + X - g25_loose_xe30Of course before one can use these triggers the basic xe triggers must be commissioned and understood *

MET TriggerL1 xeL1 Calo trigger produces MET, Scalar ET and Scaler ET (sum over jets) For each there are 8, 4 and 4 thresholdsL2 xeL1 Calo MET but corrected using L2 MuonEF xeAll calorimeter cells, all cells with noise suppression or FEB basedCan be corrected for EF muons*

MET Trigger*

MET Trigger*

*

*

*

*

*

3 menus to considerCosmic menu right before initial beamInitial beam menuPhysics menu (more speculative)*

Cosmic menu 2009v2L1L1_XE[20, 30, 50, 60]_EMPTY XEx L1_TE[150, 650]_EMPTY TEx L1_JE[120, 340]_EMPTY JEx *

Cosmic menu 2009v2Hlt requestxe30 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_v1L1Identical 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_v1HLTSame as cosmic2009 plus the standard physics chains*

ratesL1 XE RatesTrigger Name Prescale Rate Cumul 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 Rate 2.96*

*

Trigger NamePrescaleRateCumul Rate L1_TE65010.00(+/- 0.00 )0.00L1_TE360400.10(+/- 0.02 )0.10L1_TE25011000.05(+/- 0.00 )0.15L1_TE1501000000.07(+/- 0.00 )0.22Total Rate0.22

ratesTrigger Name Prescale Rate Cumul 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 Rate 2.96*

*

*

*

Trigger efficienciesWe calculate trigger efficiencies as part of the HLT MET monitoring package and MET performance packageWrt offline MET (calorimeter only for now)Useful data samples will be 2 jets, z to tau tau, w to enu and ttbar*

At startup will use L1 only with HLT in passthrough

Quickly move to enable HLT to given needed rejection with increasing luminosityUse l1 to reduce bulk of rate and ef to sharpen the turnonMonitor efficiency using special chains?*

8 met thresholds must seedInclusive met and met w muon correction triggersMET plus jet and MET plus lepton triggersAre jet triggers inclusive or exclusive?Examples of turnon curvesTrigger menu from diego slideL31 trigger menu twiki

*

*

*