Estimate of BR(B -> Xs gamma) at O(alphas2)
Abstract
Combining our results for various O(alphas2) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find BR(B -> Xs gamma) = (3.15 + 0.23) x 10-4 for Egamma > 1.6 GeV in the B-meson rest frame. The four types of uncertainties: non-perturbative (5%), parametric (3%), higher-order (3%) and mc-interpolation ambiguity (3%) have been added in quadrature to obtain the total error.
0
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.