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

2. 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

3. 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

4. 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

5. 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)

6. 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%.

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

8. 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%
GeV 95.4%
GeV 97.6%
4% of truth taus outside the eta range of 2.4
H0 TauTau evts
Rm =0.1, Ri = 0.45, Rs = [ ] depending t ET
PT_lead_track> 6 GeV, Pt tracks > 1 GeV inside Rs & Ri

9. 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