Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lepton Flavor Non-Universality in B-meson Decays from a U(2) Flavor
  Model   We address the recent anomalies in semi-leptonic $B$-meson decays using a
model of fermion masses based on the $U(2)$ flavor symmetry. The new
contributions to $b \to s \ell \ell$ transitions arise due to a tree-level
exchange of a $Z^\prime$ vector boson gauging a $U(1)$ subgroup of the flavor
symmetry. They are controlled by a single parameter and are approximately
aligned to the Standard Model prediction, with constructive interference in the
$e$-channel and destructive interference in the $\mu$-channel. The current
experimental data on semi-leptonic $B$-meson decays can be very well reproduced
without violating existing constraints from flavor violation in the quark and
lepton sectors. Our model will be tested by new measurements of $b \to s \ell
\ell$ transitions and also by future electroweak precision tests, direct
$Z^\prime$ searches, and $\mu$-$e$ conversion in nuclei.

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The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
3
The categories of this paper are: physics
16
The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an