Abstract
We compute the decay rates for the processes , where is the -boson, is the photon, and is one of the vector quarkonia or , with , 2, or 3. Our computations include corrections through relative orders and and resummations of logarithms of , to all orders in , at next-to-leading-logarithmic accuracy. ( is the velocity of the heavy quark or the heavy antiquark in the quarkonium rest frame, and and are the masses of and , respectively.) Our calculations are the first to include both the order- correction to the light-cone distributions amplitude and the resummation of logarithms of and are the first calculations for the and final states. The resummations of logarithms of that are associated with the order- and order- corrections are carried out by making use of the Abel-Padé method. We confirm the analytic result for the order- correction that was presented in a previous publication, and we correct the relative sign of the direct and indirect amplitudes and some choices of scales in that publication. Our branching fractions for and differ by and , respectively, from the branching fractions that are given in the most recent publication on this topic (in units of the uncertainties that are given in that publication). However, we argue that the uncertainties in the rates are underestimated in that publication.
- Received 9 October 2017
DOI:https://doi.org/10.1103/PhysRevD.97.016009
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Published by the American Physical Society