Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Baryon Asymmetry of the Proton Sea at Low $x$   We predict a nonvanishing baryon asymmetry of the proton sea at low $x$. It
is expected to be about $7\%$ and nearly $x$-independent at $x < 0.5 \times
10^{-3}$. The asymmetry arises from the baryon-antibaryon component of the
Pomeron, rather than from the valence quarks of the proton, which are wide
believed carriers of baryon number. Experimental study of $x$-distribution of
the baryon asymmetry of the proton sea can be performed in $ep$ or $\gamma p$
interactions at HERA, where $x\sim 10^{-5}$ are reachable, smaller than at any
of existing or planned proton colliders.

10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci