Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Physics in $B$ decays   While the LHC did not observe direct evidence for physics beyond the standard
model, indirect hints for new physics were uncovered in the flavour sector in
the decays $B\to K^*\mu^+\mu^-$, $B\to K\mu^+\mu^-/B\to Ke^+e^-$,
$B_s\to\phi\mu^+\mu^-$, $B\to D^{(*)}\tau\nu$ and $h\to\tau^\pm\mu^\mp$. Each
observable deviates from the SM predictions at the $2-3\,\sigma$ level only,
but combining all $b\to s\mu^+\mu^-$ data via a global fit, one finds
$4-5\,\sigma$ difference for NP compared to the SM and combining $B\to
D^{*}\tau\nu$ with $B\to D\tau\nu$ one obtains $3.9\,\sigma$. While $B\to
D^{(*)}\tau\nu$ and $h\to\tau\mu$ can be naturally explained by an extended
Higgs sector, the $b\to s\mu^+\mu^-$ anomalies point at a $Z'$ gauge boson.
However, it is also possible to explain $B\to D^{(*)}\tau\nu$ and $b\to
s\mu^+\mu^-$ simultaneously with leptoquarks while their effect in
$h\to\tau^\pm\mu^\mp$ is far too small to account for current data. Combining a
2HDM with a gauged $L_\mu-L_\tau$ symmetry allows for explaining the $b\to
s\mu^+\mu^-$ anomalies in combination with $h\to\tau^\pm\mu^\mp$, predicting
interesting correlations with $\tau\to3\mu$. In the light of these deviations
from the SM we also discuss the possibilities of observing lepton flavour
violating $B$ decays (e.g. $B\to K^{(*)}\tau^\pm\mu^\mp$ and
$B_s\to\tau^\pm\mu^\mp$).

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The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an