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Diphoton + MET Analysis Update

This report provides an update on the diphoton and missing transverse energy (MET) analysis from the SUSY meeting held on December 19, 2012, at UC Santa Cruz. We discuss optimization strategies for analyzing 7 TeV and 8 TeV data, focusing on signal regions with high mass bino and electroweak production. The analysis implements new observables, including HT and delta phi metrics, and evaluates the need for pixel-hit requirements. We outline future steps for optimizing backgrounds and signal limits, aiming for significant improvements in detection sensitivity.

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Diphoton + MET Analysis Update

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  1. Diphoton + MET Analysis Update Bruce Schumm UC Santa Cruz / SCIPP 19 December 2012 SUSY EtMiss Meeting

  2. Gauge Mediation Grids for 7 TeV Analysis squark/bino grid gluino/bino grid For 2012 (8 TeV) Data: Replace “constrained” SPS8 grid with wino/bino grid Bino = 10 Wino = degenerate triplet 1 and 20 Production through 1 20 and 1+ 1- “SPS8” Trajectory

  3. 2011 Signal Regions ETmiss = LocHadTopo HT = Scalar sum of all transverse energy (no ETmiss)  = minimum angle between photon and MET Strong production; high-mass bino Strong production; low-mass bino Electroweak production • For 2012: Include additional observables, for certain signal regions: • HT/ (“HT-prime”) = HT + ETmiss • j = minimum angle between jet and ETmiss • Also: ETmiss is now EGamma10NoTauLoosePhotonRef

  4. 2012 Optimization Strategy • Strong Production • Largely the same as for 2011 analysis • Explore HT/, j, removal no-pixel hit requirement on for conversion tracks • Tweak cuts for higher mass scales • HT/ somewhat preferable; j provides no apparent advantage • As for 2011, optimal point is largely background-free • Optimize for (mgluino,mbino) = (1300,1050) and (1300,150) • Electroweak Production • No real preference for HT/, but highly correlated with ETmiss so use HT. • As for strong production, two SRs (low-mass, high-mass bino) •  helps for high-mass bino SR; j helps for low-mass bino SR • Optimal point will have few-event background • Optimize for (mwino,mbino) = (600,500) and (600,100) • Still need to explore effect of pixel-hit requirement (still useful?) • Optimizations/FOM for 14 fb-1

  5. (mgluino,mbino) = (1300,1050) Chosen optimum (tentative) Includes  > 0.5 cut “FOM” is roughly number of sigma

  6. (mgluino,mbino) = (1300,150) Chosen optimum (tentative) NO  cut Vertical axis mislabeled (should be HT_Prime_Cut) “FOM” is roughly number of sigma

  7. (mwino,mbino) = (600,500) Chosen optimum (tentative) Includes  > 0.5 cut “FOM” is roughly number of sigma NOTE: Here, “HT_Cut” is correct (EW production)

  8. (mwino,mbino) = (600,100) Chosen optimum (tentative) Includes j > 0.5 cut NO  cut “FOM” is roughly number of sigma

  9. Conjecture About 2012 Reach • Optimization Results (for 14 fb-1, not quite final) • If backgrounds not underestimated, limits should be significantly higher (gluino limits between 1400-1500 GeV, Wino approaching 700?) • 2011 result had gluino limits just below 1150 Also considering “model-independent” SR with MET cut only, choosing cut at point that QCD background gives way to EW background

  10. To Do For Moriond: A Whole Lot • Optimization • Move to topocluster isolation (almost done) • Re-do HT/MET optimization grids with and without pixel-hit requirement • Backgrounds • Establish identity of the QCD control sample (one loose gamma, or one tight and one loose, or two loose) • Derive background estimates along lines of 2011 analysis (HT extrapolation) • Identify e-gamma sample for EW background estimate • Re-do e fake-rate study • Estimate EW backgrounds and systematics • All this is underway; goal is to have completed and documents by mid-January, except for quick incorporation of remaining 5-6 fb-1of data • Request unblinding mid/late January • Limits • Evaluate signal systmatics • Run through limit calculation • In parallel with approval process for unblinding

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