Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of deeply virtual Compton scattering (DVCS) cross sections
  with CLAS   The generalized parton distributions (GPDs) provide a new description of the
complex internal structure of the nucleon in terms of its elementary
constituents, the quarks and the gluons. The GPDs describe the correlation
between the transverse position and the longitudinal momentum fraction of the
partons in the nucleon, extending the information obtained from the
measurements of the form factors and the parton distribution functions. Deeply
virtual Compton scattering (DVCS), the electroproduction of a real photon from
a single quark in the nucleon, $eN \to eN\gamma$, is the most straightforward
exclusive process that allows access to the GPDs. A dedicated experiment to
study DVCS with the CLAS detector at Jefferson Lab (JLab) has been carried out
using a 5.776 GeV polarized electron beam and an unpolarized hydrogen target,
allowing us to collect DVCS events in the widest kinematic range ever explored
in the valence region: $1<Q^2<4.6$ GeV$^2$, $0.1<x_B<0.58$, and $0.09<-t<3$
GeV$^2$. We present preliminary results on the extraction of the DVCS/BH $ep
\to ep\gamma$ cross sections.

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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom