Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heavy Quarks and Structure Functions   I present a method for calculating heavy quark production which extrapolates
smoothly from the well understood limits of the fixed-flavour number scheme for
Q^2 approx m_H^2 to the zero-mass scheme at Q^2/m_H^2 -> infinity. For all Q^2
> m_H^2 the evolution of the heavy quark distribution is precisely as in the
massless MSbar scheme. The method is simple to implement and compares well with
data.

18
The categories of this paper are: econ
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc