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

CollaborationWith : Campanelli, Mario / Clark, Allan Geoffrey / Hamilton, Andrew / Lefevre, Régis / Moed, Shulamit / Sfyrla, Anna / Shreyber, Irina / Vallecorsa, Sofia / Wu, Xin
Published in Physical Review Letters. 2007, vol. 99, no. 12, p. 121801
Abstract We present the first search for heavy, long-lived particles that decay to photons at a hadron collider. We use a sample of γ+jet+missing transverse energy events in pp collisions at 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 χ˜01→γG˜ and place the world-best 95% C.L. lower limit on the χ˜01 mass of 101  GeV/c2 at τχ˜01=5  ns.
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CDF COLLABORATION. Search for Heavy Long-Lived Particles that Decay to Photons at CDF II. In: Physical Review Letters, 2007, vol. 99, n° 12, p. 121801. https://archive-ouverte.unige.ch/unige:38401

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Deposited on : 2014-07-01

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