Search for heavy, long-lived neutralinos that decay to photons at CDF II using photon timing

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Abstract

We present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via ${\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}\ensuremath{\rightarrow}\ensuremath{\gamma}\stackrel{\texttildelow{}}{G}$ in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of $570\ifmmode\pm\else\textpm\fi{}34\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$, we select $\ensuremath{\gamma}+\mathrm{\text{jet}}+\mathrm{\text{missing transverse energy}}$ candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. We find 2 events, consistent with the background estimate of $1.3\ifmmode\pm\else\textpm\fi{}0.7$ events. While our search strategy does not rely on model-specific dynamics, we set cross section limits and place the world-best 95% C.L. lower limit on the ${\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}$ mass of $101\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ at ${\ensuremath{\tau}}_{{\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}}=5\text{ }\text{ }\mathrm{ns}$.

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