Search for the anomalous production of single photons ine+e−annihilation at√s =29GeV

Abstract

This paper reports results of a search for production by radiative $e^{+}$ $e^{\mathrm{-}}$ annihilation of particles that interact only weakly in matter. The search has been made in a data set corresponding to 110 ${\mathrm{pb}}^{\mathrm{-}1}$ acquired with the ASP detector at the Stanford Linear Accelerator Center storage ring PEP (√s =29 GeV). No anomalous signal has been observed, which limits the number of generations of light neutrinos to be $N_{\nu }$<7.9 (at 90% C.L.). Limits are also placed on the masses of particles predicted to exist by models of supersymmetry.