Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of Differential Branching Fractions of Inclusive ${B \to X_u
  \, \ell^+\, \nu_{\ell}}$ Decays   The first measurements of differential branching fractions of inclusive
semileptonic ${B \to X_u \, \ell^+\, \nu_{\ell}}$ decays are performed using
the full Belle data set of 711 fb$^{-1}$ of integrated luminosity at the
$\Upsilon(4S)$ resonance and for $\ell = e, \mu$. Differential branching
fractions are reported as a function of the lepton momentum, the
four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the
hadronic mass squared. They are obtained by subtracting the backgrounds from
semileptonic ${B \to X_c \, \ell^+\, \nu_{\ell}}$ decays and other processes,
and corrected for resolution and acceptance effects. The measured distributions
are compared to predictions from inclusive and hybrid ${B \to X_u \, \ell^+\,
\nu_{\ell}}$ calculations.

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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
3
The categories of this paper are: physics
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The categories of this paper are: econ
23
The categories of this paper are: solv-int
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The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn