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.

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

References in corpus (15)

• Big-Bang Nucleosynthesis
• Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks
• B-meson decay constants: a more complete picture from full lattice QCD
• Leptonic decay constants fK, fD and fDs with Nf = 2+1+1 twisted-mass lattice QCD
• Leptonic Decays of Charged Pseudoscalar Mesons
• Decay constants of heavy pseudoscalar mesons from QCD sum rules
• Decay constants of the charmed vector mesons $D^{\ast }$ and $D_s^{\ast }$ from QCD sum rules
• Systematic uncertainties of hadron parameters obtained with QCD sum rules
• B-meson decay constants from 2+1-flavor lattice QCD with domain-wall light quarks and relativistic heavy quarks
• Can one control systematic errors of QCD sum rule predictions for bound states?
• Accurate decay-constant ratios $f_{B^{\ast }}/f_B$ and $f_{B_s^{\ast }}/f_{B_s}$ from Borel QCD sum rules
• Decay Constants of Beauty Mesons from QCD Sum Rules
• QCD sum-rule results for heavy-light meson decay constants and comparison with lattice QCD
• Heavy-Meson Decay Constants: QCD Sum-Rule Glance at Isospin Breaking
• Charmed Pseudoscalar and Vector Mesons: a Comprehensive QCD Sum-Rule View of Their Decay Constants