We use the fit results below and apply additional DY muon rejection by cutting on events with muon triggers and:

• m(trigger,soft muon)<5 GeV
• 9<m(trigger,soft muon)<10 GeV with opposite charge (upsilon rejection)
• 80<m(trigger,soft muon)<100 GeV with opposite charge (Z rejection)
• emfr(soft lepton jet)>0.8 and only 1 track w/ pT>1 in jet cone (radiative DY rejection)

TCE+1 soft electron

TCE+1 soft muon

There is a deficit in the soft muon background estimate for pT>16 GeV.  This is because the J/psi sample used to obtain the tag rate runs out of statistics at high pT.  I should fill this part in with soft muons from Z’s.  This deficit may also explain the excess of events at high pTrel.