Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing hadron structure and strong interactions with inclusive
  semileptonic decays of B mesons   The study of inclusive semileptonic decays of $B$ mesons is analyzed from the
viewpoint of probing hadron structure and strong interactions. General formulas
for the differential decay rates are given in terms of the structure functions
in arbitrary frame of reference, taking into account the finite charged lepton
mass. These formulas can be used for structure function measurements. The
behavior of the structure functions is shown to contain information on the
constitution of the $B$ meson and the dynamics of strong interactions.
Measurements of the structure functions would reveal the existence of a
point-like $b$ quark in the $B$ meson, establish the spin 1/2 nature of the $b$
quark, and identify the $b$ quantum number of the $B$ meson. These measurements
would determine the $b$ quark distribution function, and allow new insight into
the nature of confinement. The $b$ quark distribution function can also be
extracted directly through the measurements of the decay distributions with
respect to the scaling variable $\xi_+$.

18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex