Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Threshold Pion Electroproduction at Large Momentum Transfers   We consider pion electroproduction close to threshold for $Q^2$ in the region
1-10 GeV$^2$ on a nucleon target. The momentum transfer dependence of the
S-wave multipoles at threshold, $E_{0+}$ and $L_{0+}$, is calculated in the
chiral limit using light-cone sum rules. Predictions for the cross sections in
the threshold region are given taking into account P-wave contributions that,
as we argue, are model independent to a large extent. The results are compared
with the SLAC E136 data on the structure function $F_2(W,Q^2)$ in the threshold
region.

36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas