Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Next-to-Leading Order QCD Corrections to Spectator Effects in Lifetimes
  of Beauty Hadrons   Theoretical predictions of beauty hadron lifetimes, based on the heavy quark
expansion up to and including order 1/mb^2, do not to reproduce the
experimental measurements of the lifetime ratios tau(B+)/tau(Bd) and
tau(Lambdab)/tau(Bd). Large corrections to these predictions come from
phase-space enhanced 1/mb^3 contributions, i.e. hard spectator effects. In this
paper we calculate the next-to-leading order QCD corrections to the Wilson
coefficients of the local operators appearing at O(1/mb^3). We find that these
corrections improve the agreement with the experimental data. The lifetime
ratio of charged to neutral B mesons, tau(B+)/tau(Bd), turns out to be in very
good agreement with the corresponding measurement, whereas for tau(Bs)/tau(Bd)
and tau(Lambdab)/tau(Bd) there is a residual difference at the 1-sigma level.
We discuss, however, why the theoretical predictions are less accurate in the
latter cases.

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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
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The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom