Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the asymmetry parameter for the decay $\bar\Lambda \to
  \bar p\pi^+$   Based on a sample of $58\times10^6J/\psi$ decays collected with the BESII
detector at the BEPC, the $\bar\Lambda$ decay parameter $\alpha_{\bar\Lambda}$
for $\bar\Lambda\to \bar p \pi^+$ is measured using about 9000
$J/\psi\to\Lambda\bar\Lambda\to p \bar p \pi^+\pi^-$ decays. A fit to the joint
angular distributions yields $\alpha_{\bar\Lambda}(\bar\Lambda\to \bar
p\pi^+)=-0.755\pm0.083\pm0.063$, where the first error is statistical, and the
second systematic.

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The categories of this paper are: cs
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
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The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph