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

Abstract

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.

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

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• Evidence for Isospin Violation and Measurement of $CP$ Asymmetries in $B\to K^{\ast }(892)\gamma$
• Study of B0-->J/Psi D(*) and etac D(*) in Perturbative QCD
• W-exchange and W-annihilation processes of B mesons
• Renormalization of heavy-light currents in moving NRQCD
• Study on the rare radiative decay $B_c\to D_s^{\ast }\gamma$ in the standard model and multiscale walking technicolor model
• Double Penguins and the Contribution of Vector Meson--like States to the Decays $B\to K^{\ast }\gamma ,B\to \rho \gamma$
• How to trap a non-standard penguin? Isospin Symmetry Violations in B-decays with Enhanced Chromomagnetic Dipole Operator
• Bound on $\cos \alpha$ from exclusive weak radiative B decays