1. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 1 Patrick Ryan, MSU Single Top Trigger Studies Top Trigger Meeting 4 June 2007 Patrick Ryan

2. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 2 Patrick Ryan, MSU Events with No TruthAll Muons Events with no TruthAll Muons trigger L1 MU TopView Ntuples TruthAll tree - all muons Truth tree All muons from W decay Other muons included only if p T > 5 GeV What causes the trigger to fire Muons not originating at vertex Jets interacting with calorimeter In-flight decays Bug in software

3. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 3 Patrick Ryan, MSU Investigation of Events with No TruthAll Muons Calculate  R between LV1 Trigger and closest jet for 5200 (left) Range between 0 and 0.5 for most events Larger than  R between L1 Muon and reconstructed Muon (0 to 0.1) Smaller than  R between L1 Muon and Jet for entire sample (0 to 3) Most muons within jet radius (0.4) Events pass MU06

4. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 4 Patrick Ryan, MSU Investigation of Events with No TruthAll Muons Eta of events with 0 TruthAll Muons passing MU06 (right) Compared to reference sample, more events between -1 and 1 Eta-phi of events with 0 TruthAll passing MU06 (left) Events evenly distributed in phi No info gained from this plot Different samples used for each plot (explains different number of events) Events pass MU06

5. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 5 Patrick Ryan, MSU Investigation of Events with No TruthAll Muons Removal of events with no TruthAll Muons by LV2 Run over 56,250 events (162 have 0 TruthAll Muons & Pass MU06) Isolation cut removes all (hints that events come from jets) Can conclude that missing muons are from jets Muon Track Record in ESD/AOD Contains info about all muons in muon system At this time we believe it’s not necessary to look at this Question for analysis model people Why are these events not in ntuple L1L2Pass L1Pass L2 MU06mu0616224 MU06mu06l162124 MU06mu20i1620

6. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 6 Patrick Ryan, MSU Single Top Muon Efficiencies TopView Version 1212 MuidTauRec 003 ntuples Truth efficiencies No selection cuts Ratio of number of events before and after trigger Reconstructed efficiencies Apply common single top event selection (separate e and  ) At least 1 high-p T  with p T > 20 GeV No secondary lepton with both p T > 10 GeV and -1.475 <  < 1.475 N jet ≥ 2 p T 1 > 30 GeV p T 2 > 25 GeV N Jet B-tagged ≥ 1 where b-tagged jet has p T > 35 GeV E T Miss > 25 GeV Ratio before and after trigger calculated after event selection

7. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 7 Patrick Ryan, MSU Muon Efficiencies 5501 (s-channel) Reconstricted efficiencies range from 80 to 95% MU06, MU08, MU10, and MU11 show very little turn-on behavior MU20 turns on between 10 and 20 GeV Current offline cut of 20 GeV acceptable for this trigger MU40 turns on between 10 and 30 GeV Current offline cut of 20 GeV too low for this trigger

8. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 8 Patrick Ryan, MSU Muon Efficiencies 5502 (t-channel) Behavior similar to s-channel except at high p T Significant decrease in efficiency for MU20 and MU40

9. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 9 Patrick Ryan, MSU Muon Efficiencies 5200 (ttbar) Sample Behavior similar to s and t channels

10. Single Top Trigger Studies Top Trigger Meeting, 6 June 2007 - 10 Patrick Ryan, MSU Plans Continue Level 2 studies Efficiencies at Event Filter Efficiencies for e, jets, etc.