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Physics Studies Update

Physics Studies Update. FTK Meeting 01/26/06 Erik Brubaker U of Chicago. H hh4b analysis. Two algorithms for event selection in ATL-PHYS-97-104. Signal selection results. Differences 9 years ago… B-tagging efficiency m h = 90 What is s ?. Reconstructed masses. m h = 130 GeV

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Physics Studies Update

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  1. Physics Studies Update FTK Meeting 01/26/06 Erik Brubaker U of Chicago

  2. Hhh4b analysis • Two algorithms for event selection in ATL-PHYS-97-104. FTK Meeting

  3. Signal selection results • Differences • 9 years ago… • B-tagging efficiency • mh = 90 • What is s? FTK Meeting

  4. Reconstructed masses • mh =130 GeV • mH =300 GeV. FTK Meeting

  5. Background selection 97 study 4 tags eff: 10-3—2*10-5, depending on real b content Need to weight events by tagging probability… Is SHERPA really generating heavy flavor? FTK Meeting

  6. Background Selection (weighted evts) eb = 0.5, ec = 1./10.9, eu = 1./231. eb = 0.6, ec = 0.1, eu = 0.01 etot=1e-9  360 ev/fb-1 FTK Meeting

  7. When revisiting the LVL1 parametrizations h=3.2 • Understand high-h triggers. • What is range of central jet trigger? • Can jets be clustered across central/forward boundary? (If not, is there a “dead spot” or a shoulder in response?) • Use “unfluctuated” ATLFAST jets as input. • Basically a truth jet of clustered hadrons. • Extend ET range past 300 GeV. • Parametrize 4x4 ET as well as 8x8. • Investigate h dependence of params. • Investigate response of g,q,c,b? ATLFAST pT LVL1 ET FTK Meeting

  8. SHERPA questions • Are heavy quarks automatically included in ME? • What is recommended treatment or settings for MPI/underlying event at LHC? • Is there a good document that explains ycut well? • How does choice of ycut affect quantities that use low-pT jets, like MET? FTK Meeting

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