Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The charm-quark contribution to light-by-light scattering in the muon
  $(g-2)$ from lattice QCD   We compute the hadronic light-by-light scattering contribution to the muon
$g-2$ from the charm quark using lattice QCD. The calculation is performed on
ensembles generated with dynamical $(u,d,s)$ quarks at the SU(3)$_{\rm f}$
symmetric point with degenerate pion and kaon masses of around 415 MeV. It
includes the connected charm contribution, as well as the leading disconnected
Wick contraction, involving the correlation between a charm and a light-quark
loop. Cutoff effects turn out to be sizeable, which leads us to use
lighter-than-physical charm masses, to employ a broad range of lattice spacings
reaching down to 0.039 fm and to perform a combined charm-mass and continuum
extrapolation. We use the $\eta_c$ meson to define the physical charm-mass
point and obtain a final value of $a_\mu^{\rm HLbL,c} = (2.8\pm 0.5) \times
10^{-11}$, whose uncertainty is dominated by the systematics of the
extrapolation. Our result is consistent with the estimate based on a simple
charm-quark loop, whilst being free of any perturbative scheme dependence on
the charm mass. The mixed charm-light disconnected contraction contributes a
small negative amount to the final value.

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The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio