Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution equation for the heavy quark distribution function in the
  parton model approach   We explore the perturbative QCD corrections to the inclusive semileptonic
decays of $B$ mesons. In inclusive $B$ decay processes the parton picture works
well and the scaling feature manifests because the mass of $b$ quark is larger
than the QCD scale. Due to this property, the decay rate may be expressed by a
single structure function describing the light-cone distribution of $b$ quark
apart from the kinematic factor. We derive a $q^2$ evolution equation for the
distribution function, which violates the scaling property through the
Altarelli-Parisi type approach. The evolution equation is numerically solved
and its phenomenological implications are also discussed.

29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio