A Measurement Of Gamma (D(s)+ ---> Phi Mu+ Neutrino) / Gamma (D(s)+ ---> Phi Pi+)
by P.L. Frabetti et al.
Abstract. Fermilab high-energy photoproduction experiment E687 measures a branching ratio of Gamma(Ds --> phi mu+ nu) / Gamma(Ds --> phi pi+) = 0.58 +- 0.17 (stat) +- 0.07 (sys). This branching ratio is combined with theoretical inputs to obtain a new measurement of the Ds absolute branching ratio of Gamma(Ds+ --> phi pi+)/ Gamma(Ds+ --> all) = 0.031 +- 0.009 (stat) +- 0.005 (sys) +- 0.004 (theoretical).