Subleading power corrections in radiative leptonic B decay

Author(s)
Yu-Ming Wang
Abstract

I discuss the two-particle subleading power corrections in radiative leptonic B→γℓν decay at next-to-leading order in α

s with the dispersion approach. Employing the method of regions, factorization of the B→γ

form factors is demonstrated explicitly, at one loop, for a space-like hard-collinear photon. The two-particle soft (end-point) contribution is shown to be suppressed by one power of Λ/m

b, in the heavy quark limit, compared with the leading power contribution computed from QCD factorization. I further report the recent calculation on the three-particle subleading power contribution to the on-shell B→γ form factors at tree level and demonstrate that the “soft” and the “hard” three-particle corrections are of the same power, in contrast to the two-particle counterparts, as already speculated from the rapidity divergence in the corresponding factorization formulae. Phenomenological implications of the subleading power contributions to the B→γℓν amplitude are also addressed in detail, focusing on the determination of the inverse moment of the leading-twist B-meson distribution amplitude.

Organisation(s)
Particle Physics
External organisation(s)
Nankai University
Journal
Nuclear and Particle Physics Proceedings
Volume
285-286
Pages
75-80
No. of pages
6
ISSN
2405-6014
DOI
https://doi.org/10.1016/j.nuclphysbps.2017.03.014
Publication date
2017
Peer reviewed
Yes
Austrian Fields of Science 2012
103034 Particle physics
Keywords
ASJC Scopus subject areas
Nuclear and High Energy Physics
Portal url
https://ucrisportal.univie.ac.at/en/publications/subleading-power-corrections-in-radiative-leptonic-b-decay(38ba89ce-10d2-449c-b7b7-bb06e94d7c59).html