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Diphoton + MET Uses of MET

Diphoton + MET Uses of MET. Bruce Schumm UC Santa Cruz / SCIPP 18 February 2013 AdHoc EtMiss Discussion. MET in the Diphoton analysis Specific to events with identified photons (should share concerns with, e.g., H  Need to apply photon calibration to identified photons

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Diphoton + MET Uses of MET

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  1. Diphoton + MET Uses of MET Bruce Schumm UC Santa Cruz / SCIPP 18 February 2013 AdHoc EtMiss Discussion

  2. MET in the Diphoton analysis • Specific to events with identified photons (should share concerns with, e.g., H • Need to apply photon calibration to identified photons • ALSO need to apply photon calibration to identified LOOSE photons for control region studies •  Egamma10 NoTauLoosePhotonRef chosen after extensive studies. “STVF” found to be detrimental. • Documented in ATL-COM-PHYS-2013-109

  3. MET in the Diphoton analysis • Analysis requires two tight, isolated photons • Instrumental (“QCD”) background estimated via 8 control samples based on requiring one “control” photon that: 1) Satisfies loose 2) Has at least one of two shower-shape ID variables that failes tight cut. • Eight samples from A) Require additional tight photon or not; B) Control photon isolated or not; C) Require 50 or 75 GeV Et for control (and tight) photon.

  4. 20 fb-1 Background vs. Meff and MET

  5. Signal vs. Meff and MET 20 fb-1 at (Mgluino,Mbino) = (1300,1050)

  6. Selection FOM vs. Meff and MET 20 fb-1 at (Mgluino,Mbino) = (1300,1050)

  7. MET Issues • Are latest (“post-Moriond”?) object definitions included in p3128 EGamma10NoTauLoose MET? • We will need in any case to assemble our own “fluctuated” EGamma10NoTauLoose in order to do systematic studies • But for now, background estimates largely insensitive to MET systematics (data-driven), so could use intrinsic p1328 variable if “approved” • Will definitely need to be able to assemble EGamma10NoTauLoose from scratch soon though.

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