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Diphoton+MET 2015: Tasks and Timelines

Diphoton+MET 2015: Tasks and Timelines. A living document… Bruce Schumm SCIPP. Timelines I. Best guess; potential 1 month delay due to sector short 50 nsec running Few pb -1 by end of May (but trigger in commissioning) As much as 1 fb -1 by end of June 2-3 fb -1 by end of August

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Diphoton+MET 2015: Tasks and Timelines

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  1. Diphoton+MET 2015: Tasks and Timelines A living document… Bruce Schumm SCIPP

  2. Timelines I • Best guess; potential 1 month delay due to sector short • 50 nsec running • Few pb-1 by end of May (but trigger in commissioning) • As much as 1 fb-1 by end of June • 2-3 fb-1 by end of August • can use for CONF NOTE • 25 nsec running • 10 fb-1 end of October • For journal publication • Proposal: Push/optimize for 2-3 fb-1 result

  3. Timelines II • If we push for “August” result… • Analysis walkthrough end of May • ~2 Hr process, with much discussion • Expected to present unblinding case during walkthrough, up to necessary lacunae associated with data-driven studies • Editorial Board formed at that point • Draft of support note expected at that point •  Tall order!

  4. Tasks Overview • Code/Infrastructure • xAOD • Derivations • Higher-level infrastructure (Ryan’s package) • Events variables (MET with photons, etc.) • Event selection • Preliminary studies • Optimization • Backgrounds • QCD • Electroweak • Irreducible • Overlap • Models • SM samples • Strong & EW signal • Full vs. fast sim?

  5. Models • SM samples largely defined; all requests submitted (?) • Gluino, squark, wino grids defined • Requests still to be submitted • Full or fast? • Tommaso says our ~2M events OK for full sim if necessary • NB: As of 26 March, MC15 Full Sim available, Fast Sim not

  6. Backgrounds - QCD • Prior approach was to assume real diphotons are 7525% of low-MET background • Diphoton MC used to estimate high-MET contribution • Pseudophoton control sample scaled to remainder of low-MET events used to estimate -jet contribution • Are exploring replacing pseudophoton control sample method with ABCD method • If this doesn’t work, will need to re-develop pseudophoton technique (potentially involved process)

  7. Backgrounds - EW • Estimate with e control sample scaled by e fake rate • Need to select e control sample • Need to measure e fake rate (tag and probe) • W MC suggests that ~25% of EW background doesn’t arise from e fakes • Some of this may be accounted for in QCD background • Some of QCD background may include e fake events • Prior approach was to include 25% systematic error on the EW background • Should perform QCD/EW background overlap study

  8. Backgrounds: Irreducible • W contribution estimated via l control sample and simultaneous fit with SR • Question about comparison w/ VBFNLO expectation • Need to develop control sample and explore • Z contribution from Sherpa, scaled to VBFNLO (via MadGraph) in relevant kinematic region • Big difference between VBFNLO and Sherpa not understood (Sherpa much larger) • Need to revisit

  9. Tasks Overview • Code/Infrastructure • xAOD • Derivations • Higher-level infrastructure (Ryan’s package) • Events variables (MET with photons, etc.) • Event selection • Preliminary studies • Optimization • Backgrounds • QCD • Electroweak • Irreducible • Overlap • Models • SM samples • Strong • EW • Full vs. fast sim?

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