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arXiv · 0704.0760

Search for Heavy, Long-Lived Particles that Decay to Photons at CDF II

A. Abulencia et al.
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Abstract

We present the first search for heavy, long-lived particles that decay to photons at a hadron collider. We use a sample of photon+jet+missing transverse energy events in p-pbar collisions at \sqrt{s}=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 \tildeχ_1^0->γ\gravitino and place the world-best 95% C.L. lower limit on the \tildeχ_1^0 mass of 101 GeV/c^2 at τ_{\tildeχ_1^0} = 5 ns.

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A. Abulencia et al.. 2007-04-05. Search for Heavy, Long-Lived Particles that Decay to Photons at CDF II. https://doi.org/10.1103/physrevlett.99.121801

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