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FTK Production on UC Tier3 and Hidden Valley Processes

FTK Production on UC Tier3 and Hidden Valley Processes. Jan 23, 2007 Erik Brubaker FTK meeting. FTK production jobs. So far in ~1 month, produced ~12M events. Using entire tier3 cluster, I can do 1M ev/day if all goes well.

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FTK Production on UC Tier3 and Hidden Valley Processes

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  1. FTK Production on UC Tier3andHidden Valley Processes Jan 23, 2007 Erik Brubaker FTK meeting

  2. FTK production jobs • So far in ~1 month, produced ~12M events. • Using entire tier3 cluster, I can do 1M ev/day if all goes well. • Pausing now to recompile, restart production with patch from Monica/Francesco for more precision in output. • Need to remove digi files to save space. • Using 19TB of disk for those 12M events… • For 100M events (full training sample?) may need to speed up the job. • Turn off unneeded detectors in sim, digi. FTK Meeting

  3. Hidden Valley models • Matt Strassler (U Washington) explores “Hidden Valley” model space—regions having light particles, but so far inaccessible experimentally for some reason. • One class of HV models has light scalar Higgs decaying into new long-lived (3 ps-3 ns) particles. (hep-ph/0605193) • If those new particles decay to jets, the event signature is 2 pairs of jets, each pair sharing a displaced vertex. FTK Meeting

  4. HV benchmark models BOLD = I have a 100k-event sample… FTK Meeting

  5. HV model jet pT plots FTK Meeting

  6. Signal rates • Production cross section is gg->H, depends on mH • H->SS is 0.1%--1% for high mass, 1%--100% for low mass Higgs • Analyze with our full machinery to get LVL1 trigger efficiency for 4j@40GeV (ATLAS default) and 4j@25GeV (with FTK) • LVL2 efficiency depends on S lifetime, but e.g. a single tag requirement should be highly efficient • Assume 10^33—low LHC luminosity… FTK Meeting

  7. Benchmark signal rates No FTK FTK No FTK FTK No FTK FTK LVL1 is the bottleneck, so these numbers tell most of the story FTK Meeting

  8. Next steps • Come up with some simple analysis cuts to present final numbers. • Real analysis would develop sophisticated tools to find shared displaced vertex, etc. • Perform multi-threshold study a la Kohei. • Background rates shared with H->hh->4b. FTK Meeting

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