wiki:Korea2017-02-CMS-EXO-16-012

Version 10 (modified by Chalons, 7 years ago) ( diff )

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The first MadAnalysis 5 workshop on LHC recasting @ Korea

Analysis 2: CMS-EXO16-012

Students
Supervisor(s) Guillaume Chalons Jory Sonnefeld

1. Analysis summary

Mono-Higgs.

A search for dark matter is performed using events with large missing transverse momentum and a Higgs boson decaying either to a pair of bottom quarks or to a pair of photons. We are only interested in the photon pair final state. This analysis searches for excesses over the background-only prediction in events with large pTmiss and a diphoton system that has a reconstructed invariant mass close to the mass of the SM-like Higgs boson h.

2. Analysis global information

3. Selection description

3.1 Trigger selection

Diphoton triggers with asymmetric transverse energy thresholds (30/18 GeV) are used to select events with the diphoton invariant mass above 95 GeV. The trigger selection uses a very loose photon identification based on the cluster shower shape and loose isolation requirements and a requirement that the ratio of hadronic-to-electromagnetic energy (H/E) of the photon candidates is less than 0.1.

PS: This part cannot usually be described by the fast-simulation of detector.

3.2 Object definition

  • Photons: Two categories (the barrel–endcap transition region of 1.44 < |eta| < 1.57, where photon reconstruction is not optimal is excluded)
    • Photons with |eta| < 1.44
    • Photons with 1.566 < |eta| < 2.5

3.3 Cut-flow chart

3.4 Definition of exotic observables

Like SUSY transverse observable. Notice that classical MT2 & MT2W are encoded within the MadAnalysis framework.

3. Detector simulation

Can we use the last release of the Delphes package with the CMS/ATLAS MA5tune-card? or do need to improve the simulation?

4. Validation material

Contact with CMS people established. Waiting for the material

4.1 Monte-Carlo samples

  • LO/NLO? LO
  • Model used: Z′-2HDM
  • MC generator program (name + version): MADGRAPH5 aMC@NLO v2.3.0
  • Shower program (name + version): PYTHIA 8.205
  • Tune of Pythia: CUETP8M1
  • PDF set: NNPDF 3.0
  • ME/PS merging???? MLM

4.2 Reference plots / cut-flows

  • List of validation material

4. Validation results

5. Reinterpretation (optional)

6. Questions / issues

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