Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improved Measurements of Direct CP Violation in B --> K+pi-, K+pi0 and
  pi+pi0 Decays   We report an improved measurement of direct CP violation in the decay B0 -->
K+pi-, and a search for CP violation in the decays B+ --> K+pi0 and B+ -->
pi+pi0. The measured CP violating asymmetries are
Acp(K+pi-)=-0.113+-0.022(stat.)+-0.008(syst.),
Acp(K+pi0)=0.04+-0.04(stat.)+-0.02(syst.) and
Acp(pi+pi0)=0.02+-0.08(stat.)+-0.01(syst.), where the latter correspond to the
intervals -0.03<Acp(K+pi0)<0.11 and -0.12<Acp(pi+pi0)<0.15 at 90% confidence
level. These results are obtained from a data sample that contains 386 million
BBbar pairs that was collected near the Y(4S) resonance, with the Belle
detector at the KEKB asymmetric nergy e+e- collider. All of the results are
preliminary.

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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: math