Decay constants of charm and beauty pseudoscalar heavy-light mesons on fine lattices

Abstract

We compute decay constants of heavy-light mesons in quenched lattice QCD with a lattice spacing of a ~ 0.04 fm using non-perturbatively O(a) improved Wilson fermions and O(a) improved currents. We obtain f_{D_s} = 220(6)(5)(11) MeV, f_D = 206(6)(3)(22) MeV, f_{B_s} = 205(7)(26)(17) MeV and f_B = 190(8)(23)(25) MeV, using the Sommer parameter r_0 = 0.5 fm to set the scale. The first error is statistical, the second systematic and the third from assuming a +-10% uncertainty in the experimental value of r_0. A detailed discussion is given in the text. We also present results for the meson decay constants f_K and f_πand the ρmeson mass.

arXiv comment13 pages, 7 figures. Replaced version contains analysis in terms of improved quark masses instead of bare quark masses, result for f_B changed by 1 MeV. Several typos corrected, in particular error bars in table 4. Version accepted in PLB

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Cited by in corpus (14)

• Precision Measurement of B(D+ -> mu+ nu) and the Pseudoscalar Decay Constant fD+
• NNLO Vertex Corrections in charmless hadronic B decays: Imaginary part
• Measurement of B(Ds+ -->ell+ nu) and the Decay Constant fDs From 600/pb of e+e- Annihilation Data Near 4170 MeV
• Measurement of the Absolute Branching Fractions for $D_s^{-}\to {\ell }^{-}{\bar{\nu }}_{\ell }$ and Extraction of the Decay Constant $f_{D_s}$
• Excitations of single-beauty hadrons
• Determination of the pseudoscalar decay constant $f_{D_s^{+}}$ via $D_s^{+}\to {\mu }^{+}{\nu }_{\mu }$
• Semileptonic form factors D to pi, K and B to pi, K from a fine lattice
• Flavour breaking effects in the pseudoscalar meson decay constants
• SU(3) symmetry breaking in decay constants and electromagnetic properties of pseudoscalar heavy mesons
• Upper bounds on $f_D$ and $f_{D_s}$ from two-point correlation function in QCD
• Lattice cutoff effects for F_Ds with improved Wilson fermions - a final lesson from the quenched case
• A possible signature of new physics at BES-III
• Heavy-strange meson decay constants in the continuum limit of quenched QCD
• Decays of mesons with charm quarks on the lattice