Abstract
A combination of four searches for new physics involving signatures with at least one photon and large missing transverse momentum, motivated by generalized models of gauge-mediated supersymmetry (SUSY) breaking, is presented. All searches make use of proton-proton collision data at s=13 TeV, which were recorded with the CMS detector at the LHC in 2016, and correspond to an integrated luminosity of 35.9 fb−1. Signatures with at least one photon and large missing transverse momentum are categorized into events with two isolated photons, events with a lepton and a photon, events with additional jets, and events with at least one high-energy photon. No excess of events is observed beyond expectations from standard model processes, and limits are set in the context of gauge-mediated SUSY. Compared to the individual searches, the combination extends the sensitivity to gauge-mediated SUSY in both electroweak and strong production scenarios by up to 100 GeV in neutralino and chargino masses, and yields the first CMS result combining various SUSY searches in events with photons at s=13 TeV.
Highlights
The search for supersymmetry (SUSY), a possible theoretical extension of the standard model (SM) of particle physics, is an important piece of the physics program at the CERN LHC
The area at large M1 values, which is only covered by the Photon+Lepton category, corresponds to signal points with a wino-like NLSP reducing the probability of a second highenergy photon in the event
Using data recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV, and corresponding to an integrated luminosity of 35.9 fb−1, the combination improves the expected sensitivity of the searches described in Ref. [18,19,20,21]
Summary
The search for supersymmetry (SUSY), a possible theoretical extension of the standard model (SM) of particle physics, is an important piece of the physics program at the CERN LHC. Supersymmetric models with a general gauge-mediated (GGM) SUSY breaking mechanism [1,2,3,4,5,6] and R-parity conservation [7] often lead to final states containing photons and a large transverse momentum imbalance [8,9,10,11,12,13,14,15] These final states are probed by several searches based √on proton-proton (pp) collisions at a center-of-mass energy ( s) of 13 TeV recorded with the ATLAS [16,17] and CMS experiments [18,19,20,21]. [21] and focuses on strongly produced gluinos and squarks This search requires at least one isolated photon and significant hadronic HT + pγT , activity by selecting events with where HT is the scalar sum of all large values jet momenta of and HpTγγT.
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