Limits for four- and five-prong semimuonic charm meson decays

Upper limits at the 90% confidence level are presented for four- and five-prong semimuonic decays of charm mesons. From a study of four-prong vertices we find B ( D 0 → K − π + π − μ + ν )/ B ( D 0 → K − μ + ν ) B (D 0 → ( K ∗ (892)π) − μ + ν)/B(D 0 → K − μ + ν) . The five-prong vertices yield the result B ( D S + → η ′ μ + ν ) / B ( D S + → φμ + ν )