Bai, JZ (reprint author), ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA.
The absolute inclusive semileptonic branching fraction of the D-s meson has been measured based on 22.3 pb(-1) of e(+)e(-) collision data collected with the Beijing Spectrometer at root s = 4.03 GeV. At this energy, the D-s are produced in pairs: e(+)e(-) --> Ds+Ds-. We reconstructed 171 +/- 21 +/- 15 D-s events in five hadronic decay modes. In the recoil system of these events, several D-s inclusive semileptonic decays were observed and the branching fraction is estimated to be B(D-s(+) --> e(+) X) = (7.7(-4.3-2.1)(+5-7+2.4))%.