期刊
PHYSICS LETTERS B
卷 790, 期 -, 页码 257-262出版社
ELSEVIER
DOI: 10.1016/j.physletb.2019.01.033
关键词
B-meson decays; Heavy-light mesons; Nonperturbative continuum methods in quantum field theory; Parton distribution amplitudes; Quantum chromodynamics
资金
- University of Huelva, Huelva -Spain
- University of Pablo de Olavide, Seville - Spain
- Chinese Government's Thousand Talents Plan for Young Professionals
- Spanish MEyC [FPA2017-84543-P, SEV-2014-0398]
- Ministry of Education of China
- Jiangsu Province Hundred Talents Plan for Professionals
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-06CH11357]
A symmetry-preserving approach to the continuum bound-state problem in quantum field theory is used to calculate the masses, leptonic decay constants and light-front distribution amplitudes of empirically accessible heavy-light mesons. The inverse moment of the B-meson distribution is particularly important in treatments of exclusive B-decays using effective field theory and the factorisation formalism; and its value is therefore computed: lambda(B) = (zeta = 2GeV) = 0.54(3) GeV. As an example and in anticipation of precision measurements at new-generation B-factories, the branching fraction for the rare B -> gamma (E-gamma)l nu(l) radiative decay is also calculated, retaining 1/m(B)(2), and 1/E-gamma(2) corrections to the differential decay width, with the result Gamma(B -> gamma l nu l) /Gamma(B) = 0.47 (15) on E-gamma > 1.5 GeV. (C) 2019 Published by Elsevier B.V.
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