Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Next-to-leading order Q^2-evolution of the transversity distribution
  h_1(x, Q^2)   We present a calculation of the two-loop anomalous dimension for the
transversity distribution h_1(x,Q^2), $\gamma^{h(1)}_n$, in the MS scheme of
the dimensional regularization. Due to the chiral-odd nature, h_1 does not mix
with the gluon distributions, and thus our result is the same for the
flavor-singlet and nonsinglet distributions. At small n (moment of h_1),
$\gamma^{h(1)}_n$ is significantly larger than $\gamma^{f(1)}_n$ (the anomalous
dimension for the nonsinglet f_1), but approaches $\gamma^{f(1)}_n$ very
quickly at large n, keeping the relation $\gamma^{h(1)}_n > \gamma^{f(1)}_n$.
This feature is in parallel to the relation between the one-loop anomalous
dimension for f_1 and h_1.

25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph