Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Hadronic Recoil Mass Spectrum in Semileptonic B Decays and
  Extracting |V_{ub}| in a Model-Insensitive Way   We present an extended discussion of the previously noted possibility to
extract |V_{ub}| from an analysis of the hadronic recoil mass spectrum in
B->X_u l nu decays. Invariant mass spectra containing perturbative as well as
nonperturbative corrections are given; their shape is manifestly sensitive to
the three basic quantities mu_pi^2, m_b, and alpha_s$, whereas the total
integrated rate is much less so. Only a small fraction of b->u transitions
generates a recoil mass M_X of at least M_D. We find that the fraction of
events with M_X < 1.5 GeV (to reject leakage from b->c) exhibits fairly little
dependence on mu_pi^2, m_b and alpha_s; |V_{ub}| can then be extracted in a
largely model-insensitive way. This conclusion is based on the applicability of
the OPE to actual semileptonic B decays. A direct cross-check of this
assumption and a determination of the required basic parameters of the heavy
quark expansion will be possible in the future with more experimental data.

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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin