We report a new measurement of the Cabibbo-Kobayashi-Maskawa parameter [Formula presented] made with a sample of [Formula presented] [Formula presented] events collected with the CLEO II detector. Using heavy quark theory, we combine the observed yield of leptons from semileptonic [Formula presented] decay in the end-point momentum interval [Formula presented] with recent CLEO II data on [Formula presented] to find [Formula presented], where the first two uncertainties are experimental and the last two are from theory.

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Persistent URL dx.doi.org/10.1103/PhysRevLett.88.231803
Journal Physical Review Letters
Bornheim, A. (A.), Lipeles, E. (E.), Pappas, S.P. (S. P.), Shapiro, A. (A.), Sun, W.M. (W. M.), Weinstein, A.J. (A. J.), … McGee, S. (S.). (2002). Improved Measurement of [Formula presented] with Inclusive Semileptonic [Formula presented] Decays. Physical Review Letters, 88(23). doi:10.1103/PhysRevLett.88.231803