Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A $N_f = 2 + 1 + 1$ "twisted" determination of the $b$-quark mass,
  $f_{B}$ and $f_{B_s}$   We present a lattice QCD determination of the $b$-quark mass and of the
$f_{B_s}$ and $f_B$ decay constants performed with $N_f = 2 + 1 + 1$ twisted
mass Wilson fermions. We have used simulations at three values of the lattice
spacing generated by ETMC with pion masses ranging from 210 to 440 MeV. To
obtain physical quantities we performed a combined chiral and continuum limit
and an extrapolation in the heavy quark mass from the charm to the $b$-quark
region using suitable ratios calculated at nearby heavy-quark masses having an
exactly known static limit. Our results are: $m_b(m_b) = 4.29 (13)$ GeV, $f_B =
196 (9)$ MeV, $f_{B_s} = 235 (9)$ MeV, $f_{B_s} / f_B = 1.201 (25)$,
$(f_{B_s}/f_B)/(f_K/f_\pi) = 1.007 (16)$ and $(f_{B_s}/f_B)/(f_{D_s}/f_D) =
1.008 (13)$.

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The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin