Renormalon Analysis of Heavy-Light Exclusive B Decays
arXiv:hep-ph/0101190 · doi:10.1103/PhysRevD.64.034009
Abstract
We study two-body exclusive decays of the form B -> D^(*) L (L = π, ρ) in the heavy quark limit. We perform a renormalon analysis of such processes to determine the order at which nonperturbative factorization-breaking power corrections enter the amplitude. We find that a class of leading power corrections to the color octet matrix element, of O(Λ_QCD/m_b), vanish in the limit of a symmetric light meson parton distribution function. We discuss the phenomenological significance of this result.
12 pages, 2 figures
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