This Letter reports results of a search for radiative production, by e + e ~ annihilation, of particles that interact only weakly in matter. The search has been made in the total data set of 115 pb _I acquired with the ASP detector at the SLAC storage ring PEP (-Js =29 GeV). No anomalous signal was observed. The number of generations of light neutrinos has been limited to N v < 7.5 (90% confidence level). Limits are also placed on the masses of particles predicted to exist by models of supersymmetry.PACS numbers: 13.10.+q, 14.60.Gh, 14.80.Ly This Letter reports a search in the total data sample taken with the ASP detector at the SLAC e + e~ storage ring PEP for events in which only a single photon is observed in the final state. Such events signal the radiative production of particles that interact only weakly in matter,
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