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Measurement of Deeply Virtual Compton Scattering with a Polarized Proton Target

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arxiv hep-ex/0605012 v3 pith:3QBKKQPI submitted 2006-05-04 hep-ex hep-phnucl-exnucl-th

S. Chen , H. Avakian , V. Burkert , P. Eugenio , the CLAS collaboration This is my paper · ORCID
classification hep-exhep-phnucl-exnucl-th
keywords asymmetrycomptondeeplydependencepolarizedscatteringtargettarget-spin
verification ladder T0 review T1 audit T2 compute T3 formal
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The longitudinal target-spin asymmetry A_UL for the exclusive electroproduction of high energy photons was measured for the first time in p(e,e'p\gamma). The data have been accumulated at Jefferson Lab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized NH_3 target. A significant azimuthal angular dependence was observed, resulting from the interference of the Deeply Virtual Compton Scattering and Bethe-Heitler processes. The amplitude of the sin(phi) moment is 0.252 +/- 0.042(stat) +/- 0.020(sys). Theoretical calculations are in good agreement with the magnitude and the kinematic dependence of the target-spin asymmetry, which is sensitive to the generalized parton distributions H and H-tilde.

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Cited by 2 Pith papers

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  1. Exclusive photoproduction of a di-meson pair with large invariant mass

    hep-ph 2026-05 unverdicted novelty 7.0 of 10

    Computes LO amplitudes for di-meson photoproduction channels sensitive to quark GPDs and reports high cross sections suitable for GPD studies at JLab energies.

  2. Gluon skewed generalized parton distributions of proton from a light-front Hamiltonian approach

    hep-ph 2025-01 conditional novelty 5.0 of 10

    Using light-front wave functions with one dynamical gluon, the authors obtain all leading-twist gluon GPDs of the proton at nonzero skewness and find diffraction-like patterns in longitudinal position space.

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