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VBF H  tt Progress Report

VBF H  tt Progress Report. Catalin & Tony February 21, 2007. Nagging Issue - Solved. Differences between lep-had and had-had samples. eg. Njet distributions:. Lep-had. Had-had. This turned out to be due to glue-glue mixed in with VBF in lep-had sample. Lep-had. Had-had.

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VBF H  tt Progress Report

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  1. VBF HttProgress Report Catalin & Tony February 21, 2007

  2. Nagging Issue - Solved • Differences between lep-had and had-had samples eg. Njet distributions: Lep-had Had-had This turned out to be due to glue-glue mixed in with VBF in lep-had sample.

  3. Lep-had Had-had Using the truth info, we weeded out the gg events. The statistics of the sample went from 42.5k down to 8k events.

  4. Still small differences Lep-had +gen level 2 tau w/ Pt>12 and dphi<2.9 We added this requirement to mimic gen cuts in had-had sample Had-had We think diffs are still due to generator cut differences: …investigating.

  5. Offline Analysis Requires Tag Jets • PT1>40 GeV PT2>20 GeV • Dhtags4.4 Look at trigger rejection/efficiency with these added requirements.

  6. Tagging jets Lep-had 88% have Pt(j1)>40 Pt(j2)>20 Had-had 88% have Pt(j1)>40 Pt(j2)>20

  7. Signal Samples Same as left plot, plus requiring |1-2|>4.4 Lep-had, excluding tau jets. Requiring one jet with | |>2.4 efficient for analysis sample. But trigger only goes to ||=3.2. 539/1092=49% of analysis sample has at least one triggerabletag jet.

  8. Preliminary Pass at Dijet Rejection Only jets below thresh? • Dijet 1 (j1 sample):

  9. Dijet rejection (2) • If in addition we impose the LVL1 requirements (any standard or extended trigger), then: 6/62 events have | |>2.4 (10%+/- 4%) -Additional 10X rejection

  10. Next Step: LVL2 • Previously had kludged standard LVL2 implementation. • Working on using LVL2 trig sim info using our analysis code and CBNT ntuples • However, our ntuples have incomplete LVL2 info: • Signal samples have emtpy T2Calo block • Dijet samples have ~half of the T2Calo info • Trying to get help from Monika W.

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