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We have searched for the exclusive decay of the Υ(1S) into a photon and a short-lived spin-0 particle, a, decaying into e⁺e^-, using the CLEO detector at the Cornell Electron Storage Ring. Upper limits for the product branching ratio B(Υ(1S)→γa)B(a→e⁺e^-) are established for a range of masses, 2mₑ<mₐ<2m_μ.
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Bowcock et al. (1986) studied this question.
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