Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Rare Decay K^+ -> pi^+ nu nubar at the Next-to-Next-to-Leading Order
  in QCD   We calculate the charm quark contribution to the rare decay K+ -> pi+ nu
anti-nu in the next-to-next-to-leading order of QCD. This new contribution
reduces the theoretical uncertainty in the relevant parameter Pc from +/- 10.1%
down to +/- 2.4%, corresponding to scale uncertainties of +/- 1.3%, +/- 1.0%,
+/- 0.006 and +/- 1.2 degrees in BR(K+ -> pi+ nu anti-nu) and in |V_td|, sin(2
beta) and gamma extracted from the K -> pi nu anti-nu system. The error in Pc =
0.37 +/- 0.04 is now fully dominated by the current uncertainty of +/- 3.8% in
the charm quark mass mc. We find BR(K+ -> pi+ nu anti-nu) = (8.0 +/- 1.1) *
10^-11, where the quoted error stems almost entirely from the present
uncertainties in mc and the Cabibbo-Kobayashi-Maskawa elements.

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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat