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Abstract
The results of a search for new physics in final states with photons and missing transverse energy are reported. The study is based on a sample of proton–proton collisions collected at a center-of-mass energy of 13 TeV with the CMS detector in 2015, corresponding to an integrated luminosity of 2.3 fb−1. Final states with two photons and significant missing transverse energy are used to search for supersymmetric particles in models of supersymmetry (SUSY) with general gauge-mediated (GGM) supersymmetry breaking. No excess is observed with respect to the standard model expectation, and the results are used to set limits on gluino pair production and squark pair production in the GGM SUSY framework. Gluino masses below 1.65 TeV and squark masses below 1.37 TeV are excluded at a 95% confidence level.
Highlights
Final states in proton–proton collisions containing photons with high transverse momentum pT and significant missing transverse energyE miss T emerge naturally from a variety of new-physics scenarios, in models of supersymmetry (SUSY) broken via gauge mediation that require a stable, weakly interacting lightest supersymmetric particle (LSP) [1,2,3,4,5,6].The in an event, defined as the magnitude of the vector sum of the transverse momenta of all visible particles, is a consequence of undetected particles such as neutrinos or LSPs
Gluino masses below 1.65 TeV and squark masses below 1.37 TeV are excluded at a 95% confidence level
A search is performed for supersymmetry with general gauge mediation in proton–proton collisions yielding events with two photons and large missing transverse energy
Summary
E miss T emerge naturally from a variety of new-physics scenarios, in models of supersymmetry (SUSY) broken via gauge mediation that require a stable, weakly interacting lightest supersymmetric particle (LSP). Events with two photons and can arise from several standard model (SM) processes, including direct diphoton production with initial-state radiation and multijet events (possibly with associated photon production). These processes lack intrinsic but can emulate the signal if the hadronic activity in the event is mismeasured. The signal events were generated using the T5gg and T6gg simplified models and are characterized by the masses of the particles in the decay chain. The production cross sections for these processes are calculated as functions of Mg and Mq at next-to-leading-order (NLO) accuracy including the resummation of soft gluon emission at next-toleading-logarithmic (NLL) accuracy [25,26], and the uncertainties are calculated as described in Ref. [27]
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