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Update Apr 24, 2007 Erik Brubaker FTK meeting. April 24, 2007FTK Meeting2 LVL1/LVL2 jet triggers Set trigger thresholds according to TDR scheme. E.g.,

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Presentation on theme: "Update Apr 24, 2007 Erik Brubaker FTK meeting. April 24, 2007FTK Meeting2 LVL1/LVL2 jet triggers Set trigger thresholds according to TDR scheme. E.g.,"— Presentation transcript:

1 Update Apr 24, 2007 Erik Brubaker FTK meeting

2 April 24, 2007FTK Meeting2 LVL1/LVL2 jet triggers Set trigger thresholds according to TDR scheme. E.g., 65 GeV(TDR)  40 GeV(LVL1)  60 GeV(LVL2). LVL2 now has significant effect on signal efficiency. With FTK, LVL2 can have loose energy cuts; tagging requirement makes up x2 factor easily. No FTK scenario:

3 April 24, 2007FTK Meeting3 Hidden Valley process Representative scenario: –m H =100 GeV; m A =40 GeV;  A =333 ps; BR=0.1. No FTKWith FTK LVL14j@40 GeV4j@25 GeV LVL24j@57 GeV4j@38 GeV Jets 2 jets: |  | 15, m jj >20 GeV. Vertexing2 verts: r 1 cm

4 April 24, 2007FTK Meeting4 Hidden Valley signal survival With FTK, x8 more signal events accumulate in this scenario. Background very hard— resolutions, accidentals, not present in ATLFAST…

5 April 24, 2007FTK Meeting5 H->hh->4b process Default cuts too tight and/or miscalibrated. With FTK (LVL1 25 GeV cut) StartLVL14 btagsM_h cutM_H cut # Events1e+0629930046172.1430 Cut eff. 0.2990.01540.0004640 No FTK (LVL1 40 GeV cut) StartLVL14 btagsM_h cutM_H cut # Events1e+0680490255.51.3770 Cut eff. 0.08050.003170.005390 Getting back to my original process:

6 April 24, 2007FTK Meeting6 Background @ LVL1/LVL2 Using sherpa samples, 2->2+3+4 with y t =25 GeV. LVL1 rates slightly low compared to TDR, but OK. Can reproduce TDR x2 rate reduction at LVL2! Need real FTK efficiency/fake rate here!

7 April 24, 2007FTK Meeting7 To do Hidden Valley –Plot or table for different model points showing # of events expected/yr Factor improvement with FTK –Try to understand b-enriched background as discussed in earlier meetings Setting up sherpa on UC tier3 cluster H->hh->4b –Store results for different trigger cuts in one pass –Develop looser set of cuts –Use FTK b-tagging efficiency/fake estimates –For 8 model points, optimize trigger requirements for S/sqrt(S+B) assuming FTK & no FTK

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