Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rediscovery of $B^0\to J\mskip 1mu / \psi\mskip 2mu
  K^0_{\scriptscriptstyle L}$ at Belle II   We present preliminary results on the reconstruction of the $B^0\to J\mskip
1mu / \psi\mskip 2mu K^0_{\scriptscriptstyle L}$ decay, where $J\mskip 1mu /
\psi\mskip 2mu\to\mu^+\mu^-$ or $e^+e^-$. Using a dataset corresponding to a
luminosity of $62.8\pm0.6\mbox{fb}^{-1}$ collected by the Belle II experiment
at the SuperKEKB asymmetric energy $e^+e^-$ collider, we measure a total of
$267\pm21$ candidates with $J\mskip 1mu / \psi\mskip 2mu\to\mu^+\mu^-$ and
$226\pm20$ with with $J\mskip 1mu / \psi\mskip 2mu\to e^+e^-$. The quoted
errors are statistical only.

1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin