Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improved Upper Limits on the FCNC Decays $B\to K\ell^{+}\ell^{-}$ and
  $B\to K^{*}(892)\ell^{+}\ell^{-}$   We have searched a sample of 9.6 million BBbar events for the flavor-changing
neutral current decays B -> K l^+ l^- and B -> K^*(892) l^+ l^-. We subject the
latter decay to the requirement that the dilepton mass exceed 0.5 GeV. There is
no indication of a signal. We obtain the 90% confidence level upper limits on
the branching fractions Br(B -> K l^+ l^-) < 1.7 \times 10^{-6} and Br(B ->
K^*(892) l^+ l^-) < 3.3 \times 10^{-6}. We also obtain an upper limit on the
weighted average 0.65 Br(B -> K l^+ l^-) + 0.35 Br(B -> K^*(892) l^+ l^-) < 1.5
\times 10^{-6}. The weighted-average limit is only 50% above the Standard Model
prediction.

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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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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: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: math
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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: eess
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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con