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

Details Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing

2008-04-07

arxiv.org/abs/0804.1043v1

Phys.Rev.D78:032015,2008

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.78.032015

We present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via lightest neutralino to gamma gravitino in gauge-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 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 neutralino mass of 101 GeV at lifetime = 5 ns.

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