SEARCH FOR RARE AND FORBIDDEN DECAYS OF THE CHARMED MESON D+

We report on the results of a search for fourteen flavor changing neut ral current, lepton number violating, or lepton family number violatin g decays of the charmed meson D+ in the large charm sample recorded by the Fermilab photoproduction experiment E687. No evidence is seen for these rare and standard-model-forbidden decays, of the form D+ --> h( +/-)e(-/+)e(+) (with h = pi, K and e = e, mu); we determine 90% confid ence level upper limits on their absolute branching fractions in the r ange (9-20) x 10(-5). (C) 1997 Published by Elsevier Science B.V.