Abstract:
We present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via chi-tilde10-->gammaG-tilde in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570\pm 34 pb-1 of $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV, we select gamma+jet+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\pm 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 chi-tilde10 mass of 101 GeV/c2 at tauchi-tilde[sub 1][sup 0]=5 ns.
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