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Diphoton + MET: Revised QCD Background Estimates

Informal meeting discussing revised QCD background estimates for diphoton events with MET, using various control sample definitions and cuts. Analysis indicates good reproduction of tight-tight MET distribution. Results include estimates for SP1 and SP2 extrapolations.

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Diphoton + MET: Revised QCD Background Estimates

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  1. Diphoton + MET: Revised QCD Background Estimates Bruce Schumm Ben Auerbach UC Santa Cruz / SCIPP ANL 23 May 2013 Informal Photons + MET meeting

  2. Control Sample Definitions • Remember: Using MetRefFinal, and • QCDtg: One tight, one control • QCDg: No tight, once control • Also can have • 50 or 75 GeV ET cut on all (pseudo) photons • Isolation cut or not on pseudo photon (“t” photon is isolated) • Nominal control sample is QCDtg50NoIso • MC studies indicate good reproduction of tight-tight MET distribution • MC studies also suggest QCDg is OK for LocHadTopo

  3. SP1, SP2 Direct Estimates

  4. SP1 Extrapolations PARABOLIC LINEAR EXPONENTIAL

  5. SP2 Extrapolations PARABOLIC LINEAR EXPONENTIAL

  6. Also… LocHadTopo Put it all together: SP1: 0.10 +- 0.10 events SP2: 0.15 +- 0.15 events See Note for incontrovertible reasoning.

  7. WP1 QCD Background  All alternative estimates high; inflate error  WP1 background of 0.40 +- 0.40 events

  8. WP2 QCD Background  All consistent with nominal (green)  WP2 background of 0.90 +- 0.35 events

  9. MIS QCD Background  All consistent with nominal (green)  WP2 background of 0.70 +- 0.30 events

  10. Summary of QCD Background Results

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