Absolute Measurement of Important Branching Fractions of the Ds Meson

Absolute measurement of branching fractions of purely leptonic decay, semi-leptonic decay and φπ⁺ decay of the D_s meson at a c.m. energy of 4.03 GeV were completed from the BES experiment at the BEPC electron-positron collider. The method by using combined confidence level for pion and kaon separation, the D_s single and double tagging technology, and the maximum likelihood functions in the estimate of the D_s branching fractions are described in details. Discussion and comments on these physics results are made. Prospect for improved measurement of D_s physics in future is also given.