Higgs  update Catalin and Tony May 22, 2007

FTKL2 details Et thresholds: See figure below: Red cone: Rs = 0.07 Green cone: Ri = 0.1 Pale blue cone: Ro = 0.4 Et thresholds: Only look at jets with Et > 15GeV and |eta|<2.4 Only look at tracks with Et > 1GeV Highest-Pt track threshold – vary this between 1 and 7 GeV (next pages

Had-had results (%) Scenario (#in, #out) Pt(min)= 1GeV 3GeV 5GeV 7GeV (3, 0) Per event 91.2 90.9 89.5 87.3 (3, 1) 97.4 97.3 96.3 94.9 Per jet 44.9 44.4 42.9 40.6 58.1 57.5 55.2 51.9 “Per Event” means the ratio is #events passing FTK L2 / #events passing L1 “Per Jet” means the ratio is #jets passing FTK L2 / #jets from events passing L1

Lep-had results (%) Scenario (#in, #out) Pt(min)= 1GeV 3GeV 5GeV 7GeV (3, 0) Per event 79.5 78.7 76.7 74.5 (3, 1) 89.6 88.9 87.2 85.0 Per jet 38.2 37.6 36.3 34.7 49.7 49.0 47.2 44.8

Better dijet rejection? Vary the cut on Pt of signal track and look at L2 efficiency (per event). Raising the cut improves rejection by 1/3 to 1/2 (3.1)

Tau jets For the (3,1) case, look at several distributions Min R (jet-i) where i are the truth taus About 85% of the jets passing our LVL1+(3,0) FTK come from the truth taus. For (3,0) this fraction is 92%.

More on tau jets Select jets with R (jet-i)<0.1

Comparison to CMS thanks Paola jet reco. jet reco. + tracker sel. jet reco. + tracker sel. + -no neutral activity- / LR sel Loop over jets and require a R (jet-i)<0.15 match to the truth taus. Fractions in Et bin: (3,1) (3,0) 30-50 GeV 92.3% 50-70 GeV 95.4% 80-110 GeV 95.4% 130-150 GeV 97.6% 4% of truth taus outside the eta range of 2.4 H0 TauTau evts Rm =0.1, Ri = 0.45, Rs = [0.13-0.05] depending t ET PT_lead_track> 6 GeV, Pt tracks > 1 GeV inside Rs & Ri

Next steps New samples appear to give sensible results Investigate and quantify the gains from the new triggers (ditau and lep-tau) Look at both signal channels and dijet samples and find the optimal thresholds and scenario for H->tautau potential