Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-06-06
Phys.Lett. B359 (1995) 223-235
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, Latex, 3 figures (not included) available on request from alia@x4u.desy.de
Scientific paper
10.1016/0370-2693(95)01087-7
The dominant long-distance contributions to the exclusive radiative decays $B \to \rho (\omega) + \gamma$ involve photon emission from the light quarks at large distances, which cannot be treated perturbatively. We point out that this emission can be described in a theoretically consistent way as the magnetic excitation of quarks in the QCD vacuum and estimate the corresponding parity-conserving and parity-violating amplitudes using the light-cone QCD sum rule approach. These are then combined with the corresponding short-distance contribution from the magnetic moment operator in the same approach, derived earlier, to estimate the decay rates $\Gamma (B \to \rho(\omega) + \gamma)$. The implications of this result for the determination of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements in radiative $B$ decays are worked out.
Ali Abbas
Braun Vladimir M.
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