ATLAS Z plus missing transverse energy excess in the MSSM
Hewett, J. L.
Rizzo, T. G.
PublisherAmerican Physical Society
MetadataShow full item record
We demonstrate that the 3σ excess observed by ATLAS in the Z+MET channel can be explained within the context of the MSSM. Using the freedom inherent in the pMSSM, we perform a detailed analysis of the parameter space and find a scenario that describes the excess while simultaneously complying with all other search constraints from the Run I data at 7 and 8 TeV, including the Z+MET analysis by CMS. We generate a small sample of simplified models, using promising models from our existing pMSSM sample as seeds, and study their properties. The successful region is described by the production of 1st/2nd generation squark pairs, followed by their decay into a bino-like neutralino which in turn decays into a Higgsino-like LSP triplet by emitting a Z boson, i.e., q∼→B∼→h∼ with q∼=Q∼L, ͡R, or d∼R. The sweet spot for the sparticle spectrum is found to have squark masses in the 500-750 GeV range, with bino masses near 350 GeV with a mass splitting of 150-200 GeV with the Higgsino LSP. If this excess holds, then this scenario predicts that a signal will be observed in the 0l+jets and/or 1l+jets searches in the early operations of Run II.