We present the first search for heavy, long-lived particles
that decay to photons at a hadron collider. We use a sample of
gamma+jet+missing transverse energy events in p anti-p collisions at
s**(1/2) = 1.96 TeV taken with the CDF II detector. Candidate events
are selected based on the arrival time of the photon at the detector.
Using an integrated luminosity of 570 pb-1 of collision data, we observe
2 events, consistent with the background estimate of 1.3+/-0.7 events.
While our search strategy does not rely on model-specific dynamics, we
set cross section limits in a supersymmetric model with \tilda{chi}i0_1
--> gamma\tilda{G} and place the world-beat 95% C.L. lower limit on
the \tilda{chi}0_1 mass of 101 GeV/c2 at tau_{\tilda{chi}0_1} = 5 ns.
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Updated: Friday, 2007 October 19 15:42:22 CDT automatically from input from carol picciolo