Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-01819-3
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Funding
- Department of Energy (DOE)
- National Science Foundation
- French Centre National de la Recherche Scientifique
- Agence Nationale de la Recherche
- Commissariat a l'energie atomique et aux energies alternatives
- P2IO Laboratory of Excellence
- U.S. DOE [DE-AC05-060R23177]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1614479] Funding Source: National Science Foundation
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The internal structure of nucleons (protons and neutrons) remains one of the greatest outstanding problems in modern nuclear physics. By scattering high-energy electrons off a proton we are able to resolve its fundamental constituents and probe their momenta and positions. Here we investigate the dynamics of quarks and gluons inside nucleons using deeply virtual Compton scattering (DVCS)-a highly virtual photon scatters off the proton, which subsequently radiates a photon. DVCS interferes with the Bethe-Heitler (BH) process, where the photon is emitted by the electron rather than the proton. We report herein the full determination of the BH-DVCS interference by exploiting the distinct energy dependences of the DVCS and BH amplitudes. In the regime where the scattering is expected to occur off a single quark, measurements show an intriguing sensitivity to gluons, the carriers of the strong interaction.
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