Penguins leaving the pole: bound-state effects in B decaying to K* + photon

Details Penguins leaving the pole: bound-state effects in B decaying to K* + photon Penguins leaving the pole: bound-state effects in B decaying to K* + photon

1994-05-20

arxiv.org/abs/hep-ph/9405344v1

Phys.Rev. D51 (1995) 4950-4954

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages. U. of MD PP \#94-129; DOE/ER/40762-033; WM-94-104. LaTeX, One figure, available by fax or post

Scientific paper

10.1103/PhysRevD.51.4950

Applying perturbative QCD methods recently seen to give a good description of the two body hadronic decays of the B meson, we address the question of bound-state effects on the decay B into K* + gamma. Consistent with most analyses, we demonstrate that gluonic penguins, with photonic bremsstrahlung off a quark, change the decay rate by only a few percent. However, explicit off-shell b-quark effects normally discarded are found to be large in amplitude, although in the standard model accidents of phase minimize the effect on the rate. Using an asymptotic distribution amplitude for the K* and just the standard model, we can obtain a branching ratio of a few times 10^{-5}, consistent with the observed rate.

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