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The first MadAnalysis 5 workshop on LHC recasting @ Korea
Analysis 2: CMS-EXO16-012
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| 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
- CMS contact person:cms-phys-conveners-exo@cern.ch
- Center of mass energy: 13 TeV
- Integrated luminosity: 2.3 fb-1
- Link to arXiv: https://arxiv.org/pdf/1703.05236
- Link to the collaboration page: http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-16-012/
- Link to CDS: https://cds.cern.ch/record/2255523
- Link to Inspire: http://inspirehep.net/record/1517496
- Other useful links...
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.
3.2 Object definition
A global event reconstruction is performed using the particle-flow (PF) algorithm.
- Jets: Jets are reconstructed from the PF candidates using the anti-kT clustering algorithm with distance parameters of 0.4 (AK4 jet) and 0.8 (AK8 jet), as implemented in the FASTJET package. A pruning algorithm is applied to AK8 jets.
- 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
- Electrons: The reconstructed electrons must lie within |eta| < 2.5
- Muons: Muons candidates are required to be within the region |eta| < 2.4
- Taus: Tau lepton candidates are required to have |eta| < 2.3
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
