Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-05-16
Phys.Lett. B443 (1998) 264-268
Physics
High Energy Physics
High Energy Physics - Phenomenology
journal version, references updated
Scientific paper
10.1016/S0370-2693(98)01323-9
We present the next-to-next-to-leading order relation between the moments of the $\Upsilon$ system spectral density and the inclusive $B$-meson semileptonic width. The perturbative series for the width as an explicit function of the moments is well convergent in three consequent orders in the strong coupling constant that provides solid and accurate theoretical estimate. As a result, the uncertainty of the value of $|V_{cb}|$ Cabibbo-Kobayashi-Maskawa matrix element is reduced.
Penin Alexander A.
Pivovarov A. A.
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