Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of CP-violating asymmetries in B0 decays to CP eigenstates   We present measurements of time-dependent CP-violating asymmetries in neutral
B decays to several CP eigenstates. The measurement uses a data sample of 23
million Upsilon(4S)-->B-anti-B decays collected by the BABAR detector at the
PEP-II asymmetric B Factory at SLAC. In this sample, we find events where one
neutral B meson is fully reconstructed in a CP eigenstate containing charmonium
and the flavor of the other neutral B meson is determined from its decay
products. The amplitude of the CP-violating asymmetry, which in the Standard
Model is proportional to sin2beta, is derived from the decay time distributions
in such events. The result is sin2beta=0.34 +/- 0.20 (stat) +/- 0.05 (syst).

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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph