Experimental Signatures of Low Energy Gauge-Mediated Supersymmetry Breaking

Abstract

The experimental signatures for low energy gauge-mediated supersymmetry breaking are distinctive since the gravitino is naturally the lightest supersymmetric particle. The next lightest supersymmetric particle (NLSP) can be a gaugino, Higgsino, or right handed slepton. For a significant range of parameters, decay of the NLSP to its partner plus the gravitino can be measured as a displaced vertex or kink in a charged particle track. In the case that the NLSP is mostly gaugino, we identify the discovery modes as ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}+E$, and $p\overline{p}\ensuremath{\rightarrow}{l}^{+}{l}^{\ensuremath{-}}\ensuremath{\gamma}\ensuremath{\gamma}+E{}_{T}$. If the NLSP is a right-handed slepton, the discovery modes are ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{l}^{+}{l}^{\ensuremath{-}}+E$ and $p\overline{p}\ensuremath{\rightarrow}{l}^{+}{l}^{\ensuremath{-}}+E{}_{T}$. A NLSP which is mostly Higgsino is also considered.