We have searched for decays of the Υ(1S) into a single high-energy photon and a noninter-acting long-lived particle, using the CLEO detector at the Cornell Electron Storage Ring. An upper limit of 3 ×{} 10^-4 (at 90% confidence level) is obtained for the branching ratio for such decays.
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Alam et al. (1983) studied this question.
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