Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sivers distribution functions of sea quark in proton with chiral
  Lagrangian   We propose a mechanism for the Sivers distribution function in proton with
chiral Lagrangian. By introducing the gauge link of the vector meson, the
transverse momentum dependent distribution of a pion in the nucleon is
re-defined which is locally $SU(2)_V$ invariant as the Lagrangian. The eikonal
propagator is generated from the gauge link and this scenario is proved to be
equivalent to the final state interaction. By combining the calculated
splitting function and the valence $\bar{q}$ distribution in $\pi$ from the
recent fit, the sea quark Sivers function in proton is obtained. We find
reasonable numerical results for the first momentum
$x\Delta^Nf_{\bar{q}}^{(1)}(x)$ without any fine tuning of the free parameters.

5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs