Work SummaryNSF Report, 16 Nov 2007 - 1 Patrick Ryan, MSU Summary of Work Single Top Single Top trigger Have determined the optimum lepton triggers (mu20i,

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Presentation transcript:

Work SummaryNSF Report, 16 Nov Patrick Ryan, MSU Summary of Work Single Top Single Top trigger Have determined the optimum lepton triggers (mu20i, e25i OR e60) Will study combinations of lepton triggers with jet and E T Miss triggers Single Top with early data Lower p T cut on the second jet ordered in p T improves singal Confirmed that kinematic distributions are acceptable Maintain code for MSU analysis package Level 2 Muon Trigger Determined parameters for combined  reconstruction in endcap Will share an organizing role with Alessandro DiMattia

Work SummaryNSF Report, 16 Nov Patrick Ryan, MSU Truth Efficiency Truth MC sample No event selection mu6 to mu20: 20% decrease ttbar (blue) slightly higher Reconstructed Efficiency Reconstructed MC sample Single Top event selection mu6 to mu20: 10% decrease All channels similar Single Top Triggers Muon Efficiency Offline cut p T > 20 GeV Reconstructed Efficiencies Truth Efficiencies mu20 mu6 Muon Triggers greater than 80% efficient

Work SummaryNSF Report, 16 Nov Patrick Ryan, MSU Reconstructed MC events mu6 Turn-on Turn-on behavior below 10 GeV Wt channel has higher efficiency mu20 Turn-on Between 10 and 25 GeV Channels similar at low p T Wt higher at high p T Single Top Triggers Muon Turn-on Use mu20 in single top selection mu6 mu20

Work SummaryNSF Report, 16 Nov Patrick Ryan, MSU Single Top Triggers Electron Efficiency Truth Efficiency Truth MC sample No event selection e25i to e60: 15% decrease All channels similar Reconstructed Efficiency Reconstruted MC sample Single Top event selection e25i to e60: 60% decrease Channels differ at e60 t and s-channel: 22% eff Wt and ttbar 40% eff Reconstructed Efficiency Truth Efficiency Offline cut p T > 25 GeV e25i e60 e25i greater than 90% efficient

Work SummaryNSF Report, 16 Nov Patrick Ryan, MSU Single Top Triggers Electron Turn-on Curve Reconstructed MC events e25i Turn-on Between 10 and 25 GeV Channels similar at low p T Channels differ at high p T e60 Turn-on Between 10 and 60 GeV Channels differ at low p T Wt (black) & ttbar (purple) differ from s-channel (red) & t-channel (blue) Curves cross at 60 GeV e60 has no isolation cut e25i OR e60 About 3% efficiency gain Includes “tails” of top Use e25i OR e60 in single top selection e25i e60