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Status of Trigger Rates w /PU - I -- W. Smith, E. Perez & C. Leonidopoulos

Status of Trigger Rates w /PU - I -- W. Smith, E. Perez & C. Leonidopoulos. L1 Trigger: No PU: 38 kHz vs. PU=10: 61 kHz (60% increase) L1 menu for 5e32 does not need dramatic changes L1_HTT50 & lowest threshold Mu3+Jet16 should be prescaled May have to use “backup seeds” for 1E33 earlier

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Status of Trigger Rates w /PU - I -- W. Smith, E. Perez & C. Leonidopoulos

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  1. Status of Trigger Rates w/PU - I-- W. Smith, E. Perez & C. Leonidopoulos • L1 Trigger: • No PU: 38 kHz vs. PU=10: 61 kHz (60% increase) • L1 menu for 5e32 does not need dramatic changes • L1_HTT50 & lowest threshold Mu3+Jet16 should be prescaled • May have to use “backup seeds” for 1E33 earlier • HLT: 5E32: No PU: 170 Hz, PU = 10: 500 Hz • Most of rate due to SUSY Paths (remove & PU=10: 250 Hz) • SUSY: Raising ET thresh. on corrected jets reduces PU effects on HT (X2) & MHT (X4) • TOP: Previous results on QuadJet paths incorrect • Using JEC & restricting to central jets reduce PU effects • QuadJet50_BTagIP: No PU: 1.7 Hz, PU=10: 6.9 Hz • QuadJet50_Jet40_Eta2.5: No PU: 2.1 Hz, PU=10: 5.3 Hz

  2. Status of Trigger Rates w/PU – II-- G. Lungu E, not ET Current • Ways to reduce PU effects • Raise the jet thresholds after corrections • good for rates, but inefficient • Raise the jet thresholds before corrections • eta dependent • Raise the tower thresholds • Most promising (L1 more robust) • Resolution issues, fixes MET • Vertex matching at HLT • Only applicable after initial selection (CPU) • L1FastJet corrections for PU • involves tracking and global unpacking • Less obvious, but with potential • Study pile-up vs pseudo-rapidity • Review jet ID definition • Review calorimeter noise cleaning • Study beam halo effects with pile-up • JetMET trigger subgroup meets weekly Emin Requires New JEC

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