Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New method for calculating electromagnetic effects in semileptonic
  beta-decays of mesons   We construct several classes of hadronic matrix elements and relate them to
the low-energy constants in Chiral Perturbation Theory that describe the
electromagnetic effects in the semileptonic beta decay of the pion and the
kaon. We propose to calculate them using lattice QCD, and argue that such a
calculation will make an immediate impact to a number of interesting topics at
the precision frontier, including the outstanding anomalies in $|V_{us}|$ and
the top-row Cabibbo-Kobayashi-Maskawa matrix unitarity.

4
The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph