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W/Z to Muons (Preshutdown). Muon Trigger Rates Single Muons: For L=5e30 the L1 Rate: mu1cmsc_fz ~ 70 hz. Forward was about the same. Trigger was prescaled by >20 X. Dimuon Trigger was unprescaled Acceptance & Efficiency Muon ID requires A-layer.

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w z to muons preshutdown
W/Z to Muons (Preshutdown)
  • Muon Trigger Rates
    • Single Muons: For L=5e30 the L1 Rate: mu1cmsc_fz ~ 70 hz. Forward was about the same. Trigger was prescaled by >20 X.
    • Dimuon Trigger was unprescaled
  • Acceptance & Efficiency
    • Muon ID requires A-layer.
    • Central A-layer was hot and/or couldn’t be read-out (SRQ timeouts).
    • The combination nearly eliminated nseg=+-3 muons
  • Lum ~ 1 or 2 pb-1.
  • N(Z)=L* s*A*e < 20 events.
  • N(W) ~ same as Z’s, coming in mainly on mu-jet triggers.
w z to muons preshutdown1
W/Z to Muons (Preshutdown)
  • We didn’t readout much CFT but we did have the SMT, albeit with eff’y ~20% (from Z->ee)
  • We spent our time on more useful pursuits
    • Checking Fundamentals
      • unpacking of hits
      • calibration of PDT timing
      • detector orientation via scanning
      • investigating scintillator time gates with algorithm development in mind
    • Developing muon ID definitions
      • “Tight” & “Loose” and Why
      • Learning how to use the central tracker
    • Inventing data access tools. La Macchina & WZ_Reco
w z to muons preshutdown2
W/Z to Muons (Preshutdown)
  • Reco 10.07 output On D0mino /prj_root/754/wz2_2/tuples files wz_p10.07.01*_isoMuon.root and wz_p10.07.01*_nisoMuon.root contains all of the muons which passed the following cuts:
    • MuoTrfit_whits_bc>2
    • MuoTrfit_itnber>0
    • MuoTrfit_chi2>0
    • MuoTrfit_whitsA>1
    • MuoTrfit_s!hitsA>0
    • MuoTrfit_s!hitsBC>0
    • MuoTrfit_pt_muot>8 GeV/c
    • Isolated if DR(m-jet[0.5])>0.5
  • This is neither “tight” nor “loose” but is the best we could do in p10.07
w z to muons preshutdown summary
W/Z to Muons (Preshutdown) Summary
  • W/Z-> muons are rare. We don’t have events to spare.
  • Instead of spending time looking for a few events we are working, instead on fundamentals of m ID
  • We plan to continue our work along those lines
  • See a different talk about our post-shutdown plans for winter conference analysis.
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