Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing - High Energy Physics - Experiment

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Abstract: We present the results of the first hadron collider search for heavy,long-lived neutralinos that decay via lightest neutralino to gamma gravitino ingauge-mediated supersymmetry breaking models. Using an integrated luminosity of$570\pm34 pb^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV, we select$\gamma$+jet+missing transverse energy candidate events based on the arrivaltime of a high-energy photon at the electromagnetic calorimeter as measuredwith a timing system that was recently installed on the CDF II detector. Wefind 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 setcross section limits and place the world-best 95% C.L. lower limit on theneutralino mass of 101 GeV at lifetime = 5 ns.

Autor: CDF Collaboration

Fuente: https://arxiv.org/