Universality of nonperturbative QCD effects in radiative B-decays

Details Universality of nonperturbative QCD effects in radiative B-decays Universality of nonperturbative QCD effects in radiative B-decays

2002-12-11

arxiv.org/abs/hep-ph/0212162v3

Phys.Lett.B557:213-223,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 4 figures. Accepted for publication in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(03)00173-4

We demonstrate, by an explicit one-loop calculation, that at leading twist the nonperturbative effects in B -> gamma l nu, B -> gamma gamma and B -> gamma l+ l- radiative decays are contained in a common multiplicative factor (\Lambda_B(E_\gamma), where E_\gamma is the energy of the photon). We argue that this result holds also at higher orders. Ratios of the amplitudes for these processes do not depend on scales below the mass of the B-meson (M_B), and can be calculated as perturbative series in \alpha_s(M_B)

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