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Enhancing Muon Categorization for Higgs Triggering Efficiency in W->bb->μνbb Analysis

This document details the findings from the Wisconsin Group Meeting on May 19th, 2008, focusing on muon categorization methods used for triggering in Higgs boson research. Key insights include the identification of stubbed and isolated muons, with an emphasis on high-pT requirements and efficiency metrics. The analysis validates the effectiveness of MET+Jets triggers, elucidating how categorization impacts performance in WH->Wbb->μνbb events. Future steps involve recalculating trigger efficiencies and adjusting analyses for various event types to enhance overall accuracy in muon triggering strategies.

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Enhancing Muon Categorization for Higgs Triggering Efficiency in W->bb->μνbb Analysis

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  1. BMU Triggers for Higgs Jason Nett Wisconsin Group Meeting May 19th, 2008 • Muon Categorization for Triggering II BEACH 04 J. Piedra 1

  2. Review • Denominator • WH -> Wbb -> bb • Generated muon from W • pT > 18 GeV • Numerator • Isolated, high pT muons: calE/pT < 0.2, pT > 20GeV • Stubbed or Isolated tracks (CMIO minimum ionizing track) • Selection from WH analysis • Categorization • Categorize all numerator muons • Match to HEPG • form chi of pT, Eta, phi; chi < 40 - used pT dependent pT resolution • ~98% efficient • Stubbed muons: CMUP, CMX, CMU, CMP, BMU or Isolated tracks • Failures: No match, pt too low, fails isolation Wis Group Meeting 2

  3. Muon Categorization • No reconstructed muon found • Small number fail analysis type selection or matching • Note: isolated track may pass MET+JETS trig • Denominator • Candidates for BMUJET and bmujetMet • Nearly all muons understood • (NO KEYSTONE OR MINISKIRT!) Wis Group Meeting 3

  4. Methodology • Denominator • Impose denominator cuts for calculating WH -> Wbb -> bb efficiencies. • 18 GeV Generator-level muon, 2 jets >10 GeV, 1 b-tagged jet • Numerator • In CMUP, CMX regions: only stub required. • BMUJET: BMU stub, 1 central jet >10 GeV • bmujetMet: BMU stub, 1 central jet >10 GeV, L1_MET>25 GeV • MET+Jets: L1_MET>25GeV, njet20>0, njetcen10>0 • Results • MET+Jets covers many of the isolated tracks. Wis Group Meeting 4

  5. Passing Denominator for WH events • All Gen W-muons • Gen W-muons passing denominator: 18 GeV Generator-level muon, 2 jets >10 GeV, 1 b-tagged jet • Stubbed muons in events passing denominator • Still understand almost everything in denominator Wis Group Meeting 5

  6. BMUJET & bmujetMet Triggers • Fail central jet or MET cuts (or both) • bmujetMet: BMU stub, 1 central jet (>10 GeV), MET>25 GeV • BMUJET: BMU stub, 1 central jet (>10 GeV) • NOTE: bmu triggers do not explicitly check for scintillator hits here. Wis Group Meeting 6

  7. MET+Jets in IsoTracks • Many of the isolated tracks are picked up by the MET+Jets Trigger. Wis Group Meeting 7

  8. Conclusion • Nearly all reconstructed muons in WH events understood • Separate Isolated track and BMU categories into triggerable and non-triggerable. • Isolated tracks: MET+JETs triggers • BMU: BMUJET and bmujetMet triggers • Would rather have BMU trigger for BMU muons that pass MET+JETs because MET+JETs is not on at all luminosities and has tight cuts at level 3. The BMU triggers should run at all luminosities. • Trigger confirmation might be tricky for BMU since trigger is on stub only, not reconstructed muons. • Note using reconstructed muons to emulate CMUP, CMX, CMU and CMP triggers is reasonable since the trigger efficiency is very high. • Next steps • Recalculate trigger efficiencies. • Redo all for WH->llbb events. • Revisit trigger rates Wis Group Meeting 8

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