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arxiv: 1211.5584 · v2 · pith:O2YOC3T7new · submitted 2012-11-23 · ✦ hep-ph · astro-ph.CO· hep-ex

Long-lived higgsinos as probes of gravitino dark matter at the LHC

classification ✦ hep-ph astro-ph.COhep-ex
keywords darkgravitinohiggsinosmattermassr-paritysignalapproximately
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We investigate the LHC sensitivity to supersymmetric models with light higgsinos, small R-parity breaking and gravitino dark matter. The limits on decaying gravitino dark matter from gamma-ray searches with the Fermi-LAT put a lower bound on the higgsino-like neutralino NLSP decay length, giving rise to a displaced-vertex collider signature. Using publicly available tools for simulation of signal, background and detector response, we find that higgsinos with masses of 100-400 GeV and R-parity violation of approximately 10^-8 to 10^-9 can show up in the 8 TeV LHC data with 10-30 fb^-1 of integrated luminosity. We demonstrate that in the case of a signal, the higgsino mass can be determined by reconstruction of the dimuon mass edge.

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