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ASP: a search for single photon events at PEP

During the past year, two experiments have been carried out at PEP to search for events with a phoJon and large missing transverse momentum. These event searches are particularly sensitive to contributions from supersymmetric photino production but can also be used to search for additional neutrino generations, supersymmetric weak charged currents or the production of any other neutral particle whose interactions in matter are of the order of the weak interaction. The MAC collaboration began modifications of their apparatus during the summer of 1983 to be able to detect photon events with no other observed charged or neutral particles. At the same time, a new experiment, ASP, was approved for installation at the PEP ring to do a high sensitivity search for such events. At the time of the New Particles Conference, the status of the ASP detector and its potential were discussed. In this paper are included those discussions and recent limits derived from the data analyzed during the summer of 1985.