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

Abstract : 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.
Document type :
Journal articles

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Submitted on : Thursday, April 10, 2008 - 3:36:06 PM
Last modification on : Wednesday, September 15, 2021 - 2:56:02 PM

### Citation

T. Aaltonen, J. Adelman, T. Akimoto, M.G. Albrow, B. Alvarez Gonzalez, et al.. Search for Heavy, Long-Lived Neutralinos that Decay to Photons at CDF II Using Photon Timing. Physical Review D, American Physical Society, 2008, 78, pp.032015. ⟨10.1103/PhysRevD.78.032015⟩. ⟨in2p3-00271771⟩

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