Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the Xi0 -> Lambda gamma Decay Asymmetry and Branching
  Fraction   In data taken with the NA48 experiment at the CERN SPS in 1999, 730
candidates of the weak radiative hyperon decay Xi0 -> Lambda gamma have been
found with an estimated background of 58+-8 events. From these events the Xi0
-> Lambda gamma decay asymmetry has been determined to alpha(Xi0 -> Lambda
gamma) = -0.78 +- 0.18_stat +- 0.06_syst, which is the first evidence of a
decay asymmetry in Xi0 -> Lambda gamma. The branching fraction of the decay has
been measured to be Br(Xi0 -> Lambda gamma) = (1.16 +- 0.05_stat +- 0.06_syst)
x 10^-3.

13
The categories of this paper are: quant-ph
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The categories of this paper are: stat
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph