Journal of High Energy Physics (Nov 2021)

Light-cone distribution amplitudes of light mesons with QED effects

  • Martin Beneke,
  • Philipp Böer,
  • Jan-Niklas Toelstede,
  • K. Keri Vos

DOI
https://doi.org/10.1007/JHEP11(2021)059
Journal volume & issue
Vol. 2021, no. 11
pp. 1 – 30

Abstract

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Abstract We discuss the generalization of the leading-twist light-cone distribution amplitude for light mesons including QED effects. This generalization was introduced to describe virtual collinear photon exchanges at the strong-interaction scale ΛQCD in the factorization of QED effects in non-leptonic B-meson decays. In this paper we study the renormalization group evolution of this non-perturbative function. For charged mesons, in particular, this exhibits qualitative differences with respect to the well-known scale evolution in QCD only, especially regarding the endpoint-behaviour. We analytically solve the evolution equation to first order in the electromagnetic coupling α em, which resums large logarithms in QCD on top of a fixed-order expansion in α em. We further provide numerical estimates for QED corrections to Gegenbauer coefficients as well as inverse moments relevant to (QED-generalized) factorization theorems for hard exclusive processes.

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