B - Meson Distribution Amplitude from the B → π Form Factor
نویسنده
چکیده
Employing the light-cone sum rule approach in QCD, we relate the B-meson distribution amplitude to the B → π form factor at zero momentum transfer. In leading order, the sum rule is converted into a simple expression for the inverse moment λB of the distribution amplitude φ+. Using as an input the B → π form factor calculated from the light-cone sum rule in terms of pion distribution amplitudes, we obtain an estimate: λB = 460 ± 160 MeV. We investigate how this result is modified by the B-meson three-particle distribution amplitudes.
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تاریخ انتشار 2009