Abstract
A search is presented for photonic signatures motivated by generalised models of gauge-mediated supersymmetry breaking. This search makes use of $20.3{\rm fb}^{-1}$ of proton-proton collision data at $\sqrt{s}=8$ TeV recorded by the ATLAS detector at the LHC, and explores models dominated by both strong and electroweak production of supersymmetric partner states. Four experimental signatures incorporating an isolated photon and significant missing transverse momentum are explored. These signatures include events with an additional photon, lepton, $b$-quark jet, or jet activity not associated with any specific underlying quark flavor. No significant excess of events is observed above the Standard Model prediction and model-dependent 95% confidence-level exclusion limits are set.
Highlights
This paper reports on a search for four classes of events containing energetic isolated photons and large missing transverse 20.3 fb−1 momentum
The results are interpreted in the context of a broad range of general models of gauge-mediated supersymmetry breaking (GGM) [1,2,3] that include the production of supersymmetric partners of strongly coupled Standard
The data sample is selected by a trigger requiring the presence of one loose photon with energy projected into the plane transverse to the beam pipe (ET) of greater than 120 GeV for the photon þ b, photon þ j and photon þ l analyses, or two loose photons with ET > 40 GeV for the diphoton analysis
Summary
In all models of GGM, the lightest supersymmetric particle (LSP) is the gravitino G~ (the partner of the hypothetical quantum of the gravitational field), with a mass significantly less than 1 GeV. In the GGM models considered here, the decay of the supersymmetric states produced in LHC collisions would. Making use of 19.7 fb−1 of pp collision data at s 1⁄4 8 TeV, a search [6] for events similar in nature to those of the diphoton and photon þ j signatures mentioned above has performed by the CMS Collaboration, and used to set limits on the masses of strongly coupled supersymmetric particles in several GGM scenarios
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