Abstract
Results of a search for supersymmetry are presented using events with a photon, an electron or muon, and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 35.9 fb−1 of proton-proton collisions at sqrt{s} = 13 TeV, produced by the LHC and collected with the CMS detector in 2016. Theoretical models with gauge-mediated supersymmetry breaking predict events with photons in the final state, as well as electroweak gauge bosons decaying to leptons. Searches for events with a photon, a lepton, and missing transverse momentum are sensitive probes of these models. No excess of events is observed beyond expectations from standard model processes. The results of the search are interpreted in the context of simplified models inspired by gauge-mediated supersymmetry breaking. These models are used to derive upper limits on the production cross sections and set lower bounds on masses of supersymmetric particles. Gaugino masses below 930 GeV are excluded at the 95% confidence level in a simplified model with electroweak production of a neutralino and chargino. For simplified models of gluino and squark pair production, gluino masses up to 1.75 TeV and squark masses up to 1.43 TeV are excluded at the 95% confidence level.
Highlights
Background estimationThe SM backgrounds of events with one lepton, one photon, and substantial pmTiss in the final state mainly arise from three sources
We present the cross section 95% confidence level (CL) upper limits and mass exclusion contours for the T5Wg and T6Wg simplified models
A search for supersymmetry with general gauge mediation in events with a photon, an electron or muon, and large missing transverse momentum√has been presented. This analysis is based on a sample of proton-proton collisions at s = 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1 recorded by the CMS experiment in 2016
Summary
The central feature of the CMS apparatus is a superconducting solenoid with an internal diameter of 6 m, providing an axial magnetic field of 3.8 T. The energy of photons and electrons is measured by a lead tungstate crystal electromagnetic calorimeter (ECAL), covering the pseudorapidity range |η| < 1.479 in the barrel and 1.479 < |η| < 3.0 in the endcap. The momentum resolution for electrons with pT ≈ 45 GeV from Z → e+e− decays ranges from 1.7 to 4.5% It is generally better in the barrel region than in the endcaps, and depends on the bremsstrahlung energy emitted by the electron as it traverses the material in front of the ECAL [25]. Matching muons to tracks reconstructed in the silicon tracker results in a relative transverse momentum resolution, for muons with pT up to 100 GeV, of 1% in the barrel and 3% in the endcaps. A detailed description of the CMS detector, together with the definition of the coordinate system used and the relevant kinematic variables, can be found in ref. [27]
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