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Search for Supersymmetry in pp Collisions at √s=7 [square root of s=7] TeV in Events with Two Photons and Missing Transverse Energy

Citation Chatrchyan, S. et al. (CMS Collaboration) "Search for Supersymmetry in pp Collisions at s=7[square root of s=7] TeV in Events with Two Photons and Missing Transverse Energy" Phys. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. A search for supersymmetry in the context of general gauge-mediated breaking with the lightest neutralino as the next-to-lightest supersymmetric particle and the gravitino as the lightest is presented. The data sample corresponds to an integrated luminosity of 36 pb À1 recorded by the CMS experiment at the LHC. The search is performed by using events containing two or more isolated photons, at least one hadronic jet, and significant missing transverse energy. No excess of events at high missing transverse energy is observed. Upper limits on the signal cross section for general gauge-mediated supersymmetry between 0.3 and 1.1 pb at the 95% confidence level are determined for a range of squark, gluino, and neutralino masses, excluding supersymmetry parameter space that was inaccessible to previous experiments. Supersymmetry (SUSY), in particular the version based on gauge-mediated breaking [1–7], is of particular theoretical interest for physics beyond the standard model (SM). Supersymmetry stabilizes the mass of the SM Higgs boson, drives the grand unification of forces, and incorporates dark matter candidates within its framework. Previous searches for SUSY with gauge-mediated breaking [8–14] were performed by using a minimal model [15] as a benchmark. In that model, in order to reduce the number of free parameters, several assumptions, including gaugino mass unification, are made. These assumptions lead to a mass hierarchy in which strongly interacting SUSY partners are much heavier than the lightest chargino and neutralino. For example, the current best lower limit on the neutralino mass [9] of 175 GeV corresponds to gluino and squark mass limits of well above 1 TeV. In the more general case, the masses of strongly interacting SUSY partners can be much lighter, leading to large production cross sections at the LHC and allowing, even at low integrated luminosity, for the exploration of parameter space inaccessible at previous colliders. In this Letter, we consider a general gauge-mediation (GGM) SUSY scenario [16,17], with the gravitino as the lightest SUSY particle and the lightest neutralino as the next-to-lightest (NLSP). In the following, it is assumed that the neutralino decays promptly to a gravitino and a photon. Cases with either a large neutralino lifetime …