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MET Slides

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  1. MET Slides Xiaowen Lei (U. Arizona)

  2. 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

  3. 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

  4. MET Trigger

  5. MET Trigger

  6. 3 menus to consider • Cosmic menu right before initial beam • Initial beam menu • Physics menu (more speculative)

  7. Cosmic menu 2009v2 • L1 • L1_XE[20, 30, 50, 60]_EMPTY XEx L1_TE[150, 650]_EMPTY TEx L1_JE[120, 340]_EMPTY JEx

  8. 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

  9. 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

  10. InitialBeam_v1 • HLT • Same as cosmic2009 plus the standard physics chains

  11. 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

  12. 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

  13. 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

  14. 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?

  15. 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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