Abstract
We have studied single photon production in e+ e− annihilation based on a data sample corresponding to an integrated luminosity of 164.1 pb−1 at s=58 GeV. The single photon yield is consistent with the prediction of the standard model with three light neutrino species. No anomalous signal has been observed. From this result left- and right-handed scalar electrons in the mass degenerate case are excluded at 90% CL below 44.4 GeV/c2 for the massless photino.
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