Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Branching Fraction and Photon Energy Spectrum b -> s gamma   We have measured the branching fraction and photon energy spectrum for the
radiative penguin process b -> s gamma. We find BR(b -> s gamma) = (3.21 +-
0.43 +- 0.27 +0.18 -0.10) 10^(-4), where the errors are statistical,
systematic, and from theory corrections. We obtain first and second moments of
the photon energy spectrum above 2.0 GeV, < E_\gamma > = 2.346 +- 0.032 +-
0.011 GeV, and <E^2_gamma> - <E_gamma>^2 = 0.0226 +- 0.0066 +- 0.0020 GeV^2,
where the errors are statistical and systematic. From the first moment we
obtain (in MS[Bar], to order 1/M^3 and beta_0 alpha_s^2) the HQET parameter
Lambda[Bar] = 0.35 +- 0.08 +- 0.10 GeV.

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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: math
3
The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: chao-dyn