Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light quark mass dependence of the $D$ and $D_s$ decay constants   We study the light quark mass dependence of the $D$ and $D_s$ meson decay
constants, $f_D$ and $f_{D_s}$, using a covariant formulation of chiral
perturbation theory ($\chi$PT) at next-to-next-to-leading order (NNLO). Using
the HPQCD lattice results for the $D$($D_s$) decay constants as a benchmark we
show that covariant $\chi$PT can describe the HPQCD results better than heavy
meson $\chi$PT (HM$\chi$PT) at both NLO and NNLO. Within the same framework,
taking into account sub-leading ($1/m_Q$, with $m_Q$ the heavy quark mass)
corrections to the values of the low-energy constants and employing the lattice
QCD results for $g_{BB^*\pi}$, we estimate the ratio of $f_{B_s}/f_B$ to be
$1.22^{+0.05}_{-0.04}$, which agrees well with the HPQCD result $1.226(26)$.

15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga