A reanalysis of branching fractions of charmed mesonsD0,D+ andDs+

We combine highly complementary information on branching fractions of charmed mesonsD⁰,D⁺ andD_s⁺ coming from two experiments both yielding doublecharm samples. The NA 32 experiment provided exclusive branching fractions for channels with at least two charged decay products while a recent Mark III paper provides results on inclusive charm decay properties. The knowledge of channels withK⁰'s in the former is used to recalculate the charged multiplicity distribution in the latter. We obtain <n_ch>=2.25±0.08 forD⁰, <n_ch>=1.96±0.08 forD⁺ and <n_ch>=2.41±0.38 forD_s⁺. In turn the knowledge of the charged multiplicity improves the overall normalization of exclusive branching fractions. This reanalysis yields model-independent results for charmed mesons. In particular we obtain branching fractions for 16D_s⁺ decay channels including $$BF(D_s^ + \to \phi \pi ^ + ) = \left( {4.4\begin{array}{*{20}c} { + 2.3} \\ { - 1.8} \\ \end{array} } \right)\% .$$ .