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Published April 17, 1989 | Published
Journal Article Open

Measurement of the Branching Fractions for D^0 → π^-e^+v_e and D^0 → + K^-e^+V_e and Determination of │V_(cd)/V_(cs)│^2


Measurements of the exclusive branching fractions B(D^0→π^-e^+ν_e) and B(D^0→K^-e^+ν_e), using data collected at the ψ(3770) with the Mark III detector at the SLAC e^+e^- storage ring SPEAR, are used to determine the ratio of the Kobayashi-Maskawa matrix elements │V_(cd)/V_(cs)│^2 =0.057_(-0.015)^(+0.038)±0.005.

Additional Information

© 1989 The American Physical Society. Received 30 December 1988; published in the issue dated 17 April 1989. We gratefully acknowledge the dedicated efforts of the SPEAR storage ring and linear accelerator operating staffs, and the continued support of the Directorate of the Stanford Linear Accelerator Center for the SPEAR high-energy physics program. This work was supported in part by the Department of Energy, under Contracts No. DE-AC03-76SF00515, No. DE-AC02-76ER01195, No. DE-AC03-81ER40050, No. DE-AM03-76SF00034, and No. DE-AC02-87ER40318, and by the National Science Foundation.

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August 19, 2023
October 17, 2023