Abstract
Two searches for physics beyond the standard model in events containing photons are presented. The data sample used corresponds to an integrated luminosity of 19.7 inverse femtobarns of proton-proton collisions at sqrt(s) = 8 TeV, collected with the CMS experiment at the CERN LHC. The analyses pursue different inclusive search strategies. One analysis requires at least one photon, at least two jets, and a large amount of transverse momentum imbalance, while the other selects events with at least two photons and at least one jet, and uses the razor variables to search for signal events. The background expected from standard model processes is evaluated mainly from data. The results are interpreted in the context of general gauge-mediated supersymmetry, with the next-to-lightest supersymmetric particle either a bino- or wino-like neutralino, and within simplified model scenarios. Upper limits at the 95% confidence level are obtained for cross sections as functions of the masses of the intermediate supersymmetric particles.
Highlights
Supersymmetry (SUSY) [1,2,3,4,5,6,7] is a popular extension of the standard model, which offers a solution to the hierarchy problem [8] by introducing a supersymmetric partner for each standard model particle
R-parity [9,10], as are considered here, SUSY particles are produced in pairs and the lightest supersymmetric particle (LSP) is stable
If the LSP is weakly interacting, it escapes without detection, resulting in events with an imbalance p~mT iss in transverse momentum
Summary
Supersymmetry (SUSY) [1,2,3,4,5,6,7] is a popular extension of the standard model, which offers a solution to the hierarchy problem [8] by introducing a supersymmetric partner for each standard model particle. The discriminating variables are EmT iss for the single-photon analysis, and the razor variables MR and R2 [18,19] for the double-photon analysis, where EmT iss is the magnitude of p~mT iss. These studies are based on a sample of pp collision events collected with the CMS experiment at the CERN. No evidence for a signal was found, and models with production cross sections larger than ≈10 fb−1 were excluded in the context of general gauge-mediation (GGM) SUSY scenarios [24,25,26,27,28,29].
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