Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $B^0-\bar{B}^0$ Mixing at Next-to-Leading Order   We compute the perturbative corrections to the HQET sum rules for the matrix
element of the \Delta B=2 operator that determines the mass shift of $B^0$,
$\bar{B}^0$ states. Technically, we obtain analytically the non-factorizable
contributions at order $\alpha_s$ to the bag parameter that first appear at the
three-loop level. Together with the known non-perturbative corrections due to
vacuum condensates and $1/m_b$ corrections, the full next-to-leading order
result is now available. We present a numerical value for the renormalization
group invariant bag parameter that is phenomenologically relevant and discuss
comparison with recent lattice determinations.

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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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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: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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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: ao-sci
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex