Same-sign dilepton excesses and light top squarks

Run 1 data of the Large Hadron Collider (LHC) contain excessive events in the same-sign dilepton channel with b-jets and missing transverse energy (MET), which were observed by five separate analyses from the ATLAS and CMS collaborations. We show that these events could be explained by direct production of top squarks in supersymmetry. In particular, a right-handed top squark with a mass of 550 GeV decaying into 2 t quarks, 2 W bosons, and MET could fit the observed excess without being constrained by other direct search limits from Run 1. We propose kinematic cuts at 13 TeV to enhance the top squark signal, and estimate that top squarks could be discovered with 40 fb-1 of integrated luminosity at Run 2 of the LHC, when considering only the statistical uncertainty.