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Single Top Trigger Studies

Single Top Trigger Studies. Patrick Ryan. Top Trigger Meeting 21 May 2007. 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

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Single Top Trigger Studies

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  1. Single Top Trigger Studies Patrick Ryan Top Trigger Meeting 21 May 2007

  2. 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 pT > 5 GeV • What causes the trigger to fire • Muons not originating at vertex • Jets interacting with calorimeter • In-flight decays • Bug in software

  3. Investigation of Events with No TruthAll Muons • Distance between LV1 Trigger and Jets • Just received TopView ntuples with trigger info • Currently investigating • Muon Track Record in ESD/AOD • Contains info about all muons in muon system • Involves complicated study of ESD/AOD • Removal of these events by LV2 • Run over 56,250 events (162 have 0 TruthAll Muons & Pass MU06) • Isolation cut removes all (hints that events come from jets)

  4. 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 • At least 1 high-pT lepton (e or ) • Electron pT > 25 GeV • Muon pT > 20 GeV • No secondary lepton with both pT > 10 GeV and -1.475 <  < 1.475 • Njet ≥ 2 • pT1 > 30 GeV • pT2 > 25 GeV • NJetB-tagged ≥ 1 where b-tagged jet has pT > 35 GeV • ETMiss > 25 GeV • Ratio before and after trigger calculated after event selection

  5. Muon Efficiencies 5500 (Wt) Sample Current Old • Efficiencies after reconstructed efficiency • Last week (left plot): required electron OR muon in event selection • Causes low efficiency if only muon trigger is used • Currently (right plot): require a Muon • Efficiency after event selection is about 90% as expected • Will separate electron and muon analyses for future studies

  6. Muon Efficiencies s and t Channel • Efficiencies range from 80 to 95% as expected T channel s channel

  7. Plans • Investigate LV1 Muons at AOD level • Continue Level 2 studies • Efficiencies at Event Filter • Efficiencies for e, jets, etc.

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