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BMU Triggers for Higgs

BMU Triggers for Higgs. Jason Nett Wisconsin Group Meeting May 19th, 2008. Muon Categorization for Triggering II. BEACH 04. J. Piedra. 1. Review. Denominator WH -> Wbb ->  bb Generated muon from W pT > 18 GeV Numerator Isolated, high pT muons: calE/pT < 0.2, pT > 20GeV

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BMU Triggers for Higgs

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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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