= The first !MadAnalysis 5 workshop on LHC recasting @ Korea = = Analysis 2: CMS-EXO16-012 = ||= Students =|| Yongsoo Jho (Yonsei University), Jiwon Park (Hanyang University), An Seohyun (Hanyang University), Wenxing Zhang (CITP) || ||= 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 Photon reconstruction and identification seems very involved (using BDTs). * 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 === None. == 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 ==