Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The GPD H-tilde and spin correlations in wide-angle Compton scattering   Wide-angle Compton scattering (WACS) is discussed within the handbag approach
in which the amplitudes are given by products of hard subprocess amplitudes and
form factors, specific to Compton scattering, which represent 1/x-moments of
generalized parton distributions (GPDs). The quality of our present knowledge
of these form factors and of the underlying GPDs is examined. As will be
discussed in some detail the form factor R_A and the underlying GPD H-tilde are
poorly known. It is argued that future data on the spin correlations A_{LL}
and/or K_{LL} will allow for an extraction of R_A which can be used to
constrain the large -t behavior of H-tilde.

28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci