Precise Ratios of Decay Constants of Vector over Pseudoscalar $B_{(s)}$ Mesons

Abstract

The relative magnitude of the decay constants of the pseudoscalar and vector beauty mesons poses (in contrast to the case of charmed mesons) a long-standing puzzle. We revisit this problem within the framework of our recent improvements of the QCD sum-rule formalism for relating observable properties of mesons to quantum chromodynamics and are led to conclude that the decay constants of the beauty vector mesons are undoubtedly smaller than those of their pseudoscalar counterparts.

7 pages, 2 figures, contributed to "The European Physical Society Conference on High Energy Physics - EPS-HEP 2015" (22 - 29 July 2015, Vienna, Austria)