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W/Z to Muons (Preshutdown)

Analysis of muon trigger rates, efficiencies, and data reconstruction before shutdown. Limited events for W/Z decays; focus on fundamental muon ID and tracker calibration. Detailed insights into acceptance, efficiency, and event selections provided.

judithwilliam
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W/Z to Muons (Preshutdown)

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  1. 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.

  2. 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

  3. 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

  4. 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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