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Thoughts on Optimization Studies

A discussion on considerations, definitions, and estimation techniques in optimization studies, focusing on objects, observables, and background contributions for diphoton analysis.

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Thoughts on Optimization Studies

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  1. Thoughts on Optimization Studies Bruce Schumm SCIPP 08 June 2015 These are generates within the context of the diphoton analysis but perhaps some of the studies apply more generically (?)

  2. List (Partial?) of Considerations • Definitions of objects and observables, including MET • How to estimate backgrounds • Photons energy cut • Dphicuts (one sided vs. two-sided) • Meff (HT) and MET cut selection

  3. Objects and Observables • Need to have “reasonable” definitions of objects and observables. But don’t necessarily need all the small corrections, etc., especially if they’re under development • MET definition • Isolation variable and cut value?

  4. Estimating Backgrounds We discussed this at some length last Monday. Nominal samples needed are: QCD: , -jet (dijet?) EW: W, Z, tt, t IRRED: W, Z First task: Which of these samples will be ready soon, and what is the integrated luminosity of each?

  5. EW Background Contributions See “Plots with EW estimates from Monte Carlo”; “cutflow txt” from http://reece.scipp.ucsc.edu/share/SUSYDiphoton2012/plot_log.html EW Background Contributions (from MC) for high MET (MET > 150); no Meff or HT cut (I think; Ryan?) W 0.4 (0.3) Z 0.4 (0.1) tt 0.3 (0.1) t Not considered

  6. Δφ Cuts (-MET and jet-MET) • Have made one-sided cuts so far (Δφ > 0.5) • Is this the best thing? • Proposal: take 8 TeV data, make HT cut of 300 GeV and select 60 < MET < 150 • Look at distributions of the two Δφ observables

  7. Photon Energy • Use 13 TeV signal and background MC • Look at 50, 75 and 100 GeV cuts for FOM for four focus points • Otherwise use 8 TeV analysis • Recall: 8 TeV analysis used 75 GeV cut Figure of Merit

  8. Meff (HT) and MET Optimization • Perhaps as before, making “heat map” of FOM as a function of Meff (or HT, as appropriate) and MET NO YES

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