Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbative QCD analysis of b-hadron lifetimes   We develop perturbative QCD factorization theorems for inclusive b-hadron
decays, in which radiative corrections characterized by the hadronic scale, the
b-hadron mass, and the W boson mass are absorbed into a heavy hadron
distribution function, a hard b quark decay amplitude, and a "harder" function,
respectively. Double logarithmic corrections associated with a light energetic
final-state quark, which appear at kinematic end points, are absorbed into a
jet function. Various large logarithms contained in the above functions are
summed to all orders, leading to the evolution factors among the three
characteristic scales. The heavy hadron distribution function is identical to
the one constructed in the framework of heavy quark effective theory. It is
shown that hadron kinematics must be employed in factorization theorems, and
that perturbative contributions, depending on hadron kinematics, distinguish
the lifetimes of the b-hadrons $B_d, B_s$ and $\Lambda_b$. Assuming the same
heavy-quark-effective-theory parametesr $\lambda_1$ for these hadrons, we
predict the lifetimes $\tau(B_d)=1.56$ ps, $\tau(B_s)=1.46$ ps and
$\tau(\Lambda_b)=1.22$ ps. We also predict the $B_u$ meson lifetime
$\tau(B_u)=1.62$ ps by varying the B meson distribution function slightly. All
the above results are consistent with experimental data.

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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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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: econ
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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: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat