Abstract
Using a silicon-microstrip detector array to identify secondary vertices occurring downstream of a short platinum target, we have searched for the decay [ital D][sup 0][r arrow][mu][sup +][mu][sup [minus]]. Normalized relative to the [ital J]/[psi][r arrow][mu][sup +][mu][sup [minus]] signal observed in the same data sample, for a 3.25-mm minimum decay distance our branching-ratio sensitivity is (4.8[plus minus]1.4)[times]10[sup [minus]6] per event, and after background subtraction we observe [minus]4.1[plus minus]4.8 events. Using the statistical approach advocated by the Particle Data Group, we obtain a limit [ital B]([ital D][sup 0][r arrow][mu][sup +][mu][sup [minus]])[lt]3.1[times]10[sup [minus]5] at 90% confidence, confirming with a different technique the limit previously obtained by Louis [ital et] [ital al]. The interpretation of the upper limit involves complex statistical issues; we present another approach which is more suitable for combining the results of different experiments.
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