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://ucris.univie.ac.at/portal/en/publications/subleading-power-corrections-in-radiative-leptonic-b-decay(38ba89ce-10d2-449c-b7b7-bb06e94d7c59).html