Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the Direct CP Asymmetry in b -> s gamma Decays   We describe a measurement of the direct CP asymmetry between inclusive b -> s
gamma and bbar -> sbar gamma decays. This asymmetry is expected to be less than
0.01 in the Standard Model, but could be enhanced up to about 0.10 by new
physics contributions. We use a sample of 89 million BB pairs recorded with the
BaBar detector at PEP-II, from which we reconstruct a set of 12 exclusive b ->
s gamma final states containing one charged or neutral kaon and one to three
pions. We measure an asymmetry of A_CP(b -> s gamma) = 0.025 +/- 0.050(stat.)
+/- 0.015(syst.), corresponding to an allowed range of -0.06 < A_CP(b -> s
gamma) < +0.11 at 90% confidence level.

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The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci