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Optimizing Meff Trigger for Enhanced Signal Efficiency in High-Energy Physics

The Meff trigger, defined as Meff = HT + MHT, represents a transverse scale of an event, allowing for a more model-independent approach compared to traditional high-threshold jet triggers. It accommodates various mass splittings, particularly beneficial in QCD events that contribute significantly to the overall rate. The Meff trigger permits higher thresholds than the HT trigger while ensuring good signal efficiency. Event yields comparable to HT200U have been observed for Meff values between 220U and 230U, demonstrating its effectiveness in jet selection and signal detection.

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Optimizing Meff Trigger for Enhanced Signal Efficiency in High-Energy Physics

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  1. Meff Trigger Proposal • Motivation: • Meff=HT+MHT represents “transverse scale” of an event • more model independent than a single jet trigger with a high threshold • it also allows for different mass splittingsthan, e.g. in mSuGra(our current signal model) • for QCD which contributes most of the rate, a Meff trigger is ~equivalent to an HT trigger (no true missing energy) • for SUSY,MHT is a significant contribution to Meff • Therefore, a Meff trigger should allow a higher threshold than an HT trigger while still maintaining good signal efficiency • Observe event yields (=rates) comparable to HT200U for ~Meff220U - 230U calculated from 15U jets

  2. Data JetMET Event Selection: Reference (black): Meff=HT+MHT from all corrected jets with pt > 30 GeVand|eta|<3, Leading jet pt <100 GeV, 2nd jet pt>80 GeV Simulated Trigger: calculate HT and Meff from uncorrected jets with pt > 15 GeV Note: I require HLT_Jet50U in the JetMET dataset to be true HT Trigger Meff Trigger

  3. QCD PYTHIA6 Event Selection: Reference (black): Meff=HT+MHT from all corrected jets with pt > 30 GeVand|eta|<3, Leading jet pt <100 GeV, 2nd jet pt>80 GeV Simulated Trigger: calculate HT and Meff from uncorrected jets with pt > 15 GeV Note: to be consistent with data I require leading uncorrected jet pt > 50 GeV HT Trigger Meff Trigger

  4. LM0 Event Selection: Reference (black): Meff=HT+MHT from all corrected jets with pt > 30 GeVand|eta|<3, Leading jet pt <100 GeV, 2nd jet pt>80 GeV Simulated Trigger: calculate HT and Meff from uncorrected jets with pt > 15 GeV Note: to be consistent with data I require leading uncorrected jet pt > 50 GeV HT Trigger Meff Trigger

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