Wenu tag &probe Bo li CPPM, Shandong university 1 Common information DATA2011: D1-H4 , MC10b egamma stream Common object selection Add trigger after Run182726 : EF_e13_etcut_xs60_noMu 2 Trigger in data 4 triggers after GRL: 1.699×107 EF_g20_etcut_xe30_noMu: 3.50×106 (20.60 %) EF_xs60_noMu_L1EM10XS45: 7.16×106 (42.14 %) EF_xs75_noMu_L1EM10XS50: 1.55×106 (9.14 %) EF_e13_etcut_xs60_noMu: 6.76×106 (39.81 %) 3 Trigger in data 4 Cut flow DATA total 1.495×108 GRL 1.298×108 Npv 1.296×107 trigger 1.699×107 METclean 1.692×107 MC10b total 6999096 npv 6995657 METclean 6966735 Ele 5707968 Ele 1.491×107 Ele Et 4590886 Ele Et 1.394×107 zveto 4588102 zveto 1.393×107 MET 3517203 MET 1.110×107 MT 3435482 MT METiso10>0.7 1361324 1.077×107 METiso10>0.7 2329822 Loose Medium tight 1285948 1182957 925439 Loose Medium Tight 1720040 1537576 1271634 5 Pile-up reweight Before reweight After reweight 6 Ele performance Good agreement between DATA and MC after pileup reweight 7 Effi vs Ele pt The effic in eta (-2.5,2.5) 8 Effi vs Ele pt 9 Effi vs Ele eta Effic in pt (20, 50 Gev) 10 Effi vs Ele eta 11 Conclusion Good agreement between Data and mc The effic is comparable with Elzbieta’s results 12