Heavy-Meson Decay Constants: Isospin Breaking from QCD Sum Rules

Abstract

Compared with lattice QCD, isospin breaking of heavy-meson decay constants from QCD sum rules agrees for $D$ mesons but disagrees (by a factor of four) for $B$ mesons.

Comments: 8 pages, 2 figures, talk presented at "Quark Confinement and the Hadron Spectrum XII" (28 August - 3 September 2016, Thessaloniki, Greece)