Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD Predictions for Lepton Spectra in Inclusive Heavy Flavour Decays   We derive the lepton spectrum in semileptonic beauty decays from a
nonperturbative treatment of QCD; it is based on an expansion in $1/m_Q$ with
$m_Q$ being the heavy flavour quark mass. The leading corrections arising on
the $1/m_Q$ level are completely expressed in terms of the difference in the
mass of the heavy hadron and the quark. Nontrivial effects appear in $1/m_Q^2$
terms affecting mainly the endpoint region; they are different for meson and
baryon decays as well as for beauty and charm decays.

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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
1
The categories of this paper are: cs
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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: adap-org
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The categories of this paper are: astro-ph
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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: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio