Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for the rare decay KS -> mu+ mu-   A search for the decay KS -> mu+ mu- is performed, based on a data sample of
1.0 fb^-1 of pp collisions at \sqrt{s}=7 TeV collected by the LHCb experiment
at the Large Hadron Collider. The observed number of candidates is consistent
with the background-only hypothesis, yielding an upper limit of BR(KS -> mu+
mu-) < 11 (9) x 10^-9 at 95 (90)% confidence level. This limit is a factor of
thirty below the previous measurement.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat