Large Hadron Collider constraints on a light baryon number violating sbottom coupling to a top and a light quark
Abstract
We investigate a model of R-parity violating (RPV) supersymmetry in which the right-handed sbottom is the lightest supersymmetric particle, and a baryon number violating coupling involving a top is the only non-negligible RPV coupling. This model evades proton decay and flavour constraints. We consider in turn each of the couplings lambda"313 and lambda"323 as the only non-negligible RPV coupling, and we recast two recent Large Hadron Collider (LHC) measurements and searches (CMS top transverse momentum pT(t) spectrum and ATLAS multiple jet resonance search) in the form of constraints on the mass-coupling parameter planes. We delineate a large region in the parameter space of the mass of the sbottom (mbR) and the lambda"313 coupling that is ruled out by the measurements, as well as a smaller region in the parameter space of mbR and lambda"323. A certain region of the mbR-lambda"313 parameter space was previously found to successfully explain the anomalously large ttbar forward backward asymmetry measured by Tevatron experiments. The entire region is excluded at the 95% CL by CMS measurements of the top pT spectrum. We also present pT(ttbar) distributions of the forward-backward asymmetry for this model.
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