Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of the rare decays of $B^0_s$ and $B^0$ into muon pairs from data
  collected during the LHC Run 1 with the ATLAS detector   A study of the decays $B^0\to \mu^+\mu^-$ and $B^0_s\to \mu^+\mu^-$ has been
performed using data corresponding to an integrated luminosity of $25$
fb$^{-1}$ of $7$ TeV and $8$ TeV proton--proton collisions collected with the
ATLAS detector during the LHC Run 1. For $B^0$, an upper limit on the branching
fraction is set at ${\cal B}(B^0 \to \mu^+\mu^-) < 4.2 \times 10^{-10}$ at
$95\%$ confidence level. For $B^0_s$, the branching fraction ${\cal B}(B^0_s
\to \mu^+\mu^-) = \left( 0.9^{+1.1}_{-0.8} \right) \times 10^{-9}$ is measured.
The results are consistent with the Standard Model expectation with a $p$-value
of $4.8\%$, corresponding to $2.0$ standard deviations.

34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th