Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The beauty of the rare: $B_{(s)}\rightarrow \mu^{+} \mu ^{-}$ at the
  LHCb   The latest and improved measurements in $B^0_{(s)}\rightarrow\mu^+ \mu^-$
processes have been performed by LHCb using full Run 1 and Run 2 data. The
measurement of the branching fraction of $B^0_{s}\rightarrow\mu^+ \mu^-$ is
presented as the most precise single experiment measurement of such a rare
process. While no significant excess is found for $B^0\rightarrow\mu^+ \mu^-$,
an stringent upper limit is set for its braching fraction. Both results are in
agreement with SM predictions and with previous results.

10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs