Consistency of the recent ATLAS $Z+E_T^{\mathrm{miss}}$ excess in a simplified GGM model

Abstract

ATLAS recently reported a $3\sigma$ excess in a leptonic-$Z+E_T^{\mathrm{miss}}$ channel. This was interpreted in the literature in a simplified General Gauge Mediation model containing a gluino, a higgsino next-to-lightest supersymmetric particle (NLSP) and a gravitino lightest supersymmetric particle (LSP). We test the consistency of this explanation in lieu of the results of the corresponding search in CMS, and other LHC searches for New Physics. Due to non-decoupling effects from squarks the parameter space of these models is split into two regions; in one region additional leptons via top quark production is expected, while the other region sees a large probability for zero-lepton events. After combining the relevant constraints we find that these models cannot explain the ATLAS excess.

Extended discussion of results, added two figures, minor corrections. 7 pages, 6 figures

References in corpus (8)

• PYTHIA 6.4 Physics and Manual
• General Gauge Mediation
• Threshold resummation for squark-antisquark and gluino-pair production at the LHC
• Soft gluon resummation for the production of gluino-gluino and squark-antisquark pairs at the LHC
• Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using $\sqrt{s}=8$ TeV proton--proton collision data
• Higgs Physics as a Window Beyond the MSSM (BMSSM)
• Search for direct top-squark pair production in final states with two leptons in pp collisions at sqrt(s)=8TeV with the ATLAS detector
• Search for anomalous production of events with three or more leptons in pp collisions at sqrt(s) = 8 TeV

Cited by in corpus (4)

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• Leptophobic boson signals with leptons, jets and missing energy
• Explanation of the ATLAS Z-peaked excess in the NMSSM
• Aspects of astrophysical particle production and beyond the Standard Model phenomenology