Light quark mass dependence of the D and Ds decay constants

We study the light quark mass dependence of the D and Ds meson decay constants, fD and fDs, using a covariant formulation of chiral perturbation theory (χPT) at next-to-next-to-leading order (NNLO). Using the HPQCD lattice results for the D (Ds) decay constants as a benchmark we show that covariant...

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Bibliographic Details
Published in:Physics letters. B 2011-02, Vol.696 (4), p.390-395
Main Authors: Geng, L.S., Altenbuchinger, M., Weise, W.
Format: Article
Language:English
Subjects:
Covariant chiral perturbation theory
Decays of charmed and bottom mesons
Exact sciences and technology
Lattice QCD calculations
Nuclear physics
Physics
The physics of elementary particles and fields
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Summary:We study the light quark mass dependence of the D and Ds meson decay constants, fD and fDs, using a covariant formulation of chiral perturbation theory (χPT) at next-to-next-to-leading order (NNLO). Using the HPQCD lattice results for the D (Ds) decay constants as a benchmark we show that covariant χPT can describe the HPQCD results better than heavy meson χPT (HMχPT) at both NLO and NNLO. Within the same framework, taking into account sub-leading (1/mQ, with mQ the heavy quark mass) corrections to the values of the low-energy constants and employing the lattice QCD results for gBB⁎π, we estimate the ratio of fBs/fB to be 1.22−0.04+0.05, which agrees well with the HPQCD result 1.226(26).
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2010.12.060