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Update on H/Abb -> 4b’s process (4jet Trigger)

Update on H/Abb -> 4b’s process (4jet Trigger). Kohei Yorita Young-Kee Kim University of Chicago @ the FTK Meeting on Sep. 7 th , 2006. Review (What’s been done so far).

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Update on H/Abb -> 4b’s process (4jet Trigger)

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  1. Update on H/Abb -> 4b’s process (4jet Trigger) Kohei Yorita Young-Kee Kim University of Chicago @ the FTK Meeting on Sep. 7th, 2006

  2. Review (What’s been done so far) TDR-style-analysis, i.e. Based on Atlfast jet and Used single threshold. This improvement is given by lowering 4J threshold from ~60-70 GeV to 40 GeV where LVL1 output rate is 1KHz. (TDR (~200Hz) @ ~60 GeV) But LVL2 out can be ~100Hz by FTK btagging.

  3. Multi-Threshold Scan (Atlfast basis) Each point was selected when trigger rate became closest to 1KHz in each case. Keeping 1KHz by increasing 1st (~80 GeV), 2nd (60-70 GeV), and 3rd (40-50) jet Pt but by lowering 4th jet Pt (20 , 30 GeV), Signal (M_A = 500 GeV) acceptance increases by a factor of 1.5~2 !!!

  4. Trigger Rate Calculations with New Samples and LVL1 Parameterization Note : Lum = “2”x1033 Looks very close to Erik’s Numbers (Note luminosity) Given the assumption that LVL1 output max is 1KHz, we can lower the threshold to ~20GeV(8x8 calo.) from 40 GeV(8x8 calo.).

  5. Some issues : Old vs New Sherpa Samples Note : Lum = “2”x1033 All new sherpa samples give lower rate than old 2->2+3, yt>25 sample Which was used as a default so far. Old : 1KHz @ 40 GeV New : 1KHz @ 30 GeV. If this is “expected” feature and Not due to bugs, We will have to redo sensitivity study By lowering 4th jet pt to 30 GeV, not 40 GeV

  6. > Things to do : (To Finalize) - Multi-Threshold Study by using “LVL1 Parameterization”. - In progress now. - Good to try to measure dijet (H/A) mass. - Systematics ? - Final Check with other generator & setting. - Documentation … -- Being Prepared ! - Any other issues ?

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