Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Estimate of the K0-K0bar Mixing Amplitude   We computed the B_K parameter on the lattice by using a non-perturbatively
improved Wilson action. From our quenched simulation, in the MSbar scheme and
at mu=2 GeV, we obtain B_K=0.73(7)^{+0.05}_{-0.01}. To gain some insight in the
systematic errors due to the use of the quenched approximation, we also made
the unquenched computation with Wilson fermions. We do not observe any
significant deviation with respect to the quenched result.

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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: math
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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: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an