Journal
PHYSICAL REVIEW LETTERS
Volume 119, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.202004
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Funding
- Chilean Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
- Italian Instituto Nazionale di Fisica Nucleare
- French Centre National de la Recherche Scientifique
- French Commissariat a l'Energie Atomique
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-06CH11357]
- United Kingdom Science and Technology Facilities Council (STFC)
- Scottish Universities Physics Alliance (SUPA)
- National Research Foundation of Korea
- Office of Research and Economic Development at Mississippi State University
- Consulat General de France a Jerusalem
- United States Department of Energy [DE-AC05-06OR23177]
- Science and Technology Facilities Council [ST/G008582/1] Funding Source: researchfish
- Division Of Physics
- Direct For Mathematical & Physical Scien [1505615] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1306737, 1506172, 1615146] Funding Source: National Science Foundation
- STFC [ST/L005719/1, ST/P004458/1, ST/G008582/1, ST/J000175/1] Funding Source: UKRI
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We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment uses the 6 GeV electron beam from the Continuous Electron Beam Accelerator Facility (CEBAF) accelerator at Jefferson Lab incident on a pressurized He-4 gaseous target placed in front of the CEBAF Large Acceptance Spectrometer (CLAS). The scattered electron is detected by CLAS and the photon by a dedicated electromagnetic calorimeter at forward angles. To ensure the exclusivity of the process, a specially designed radial time projection chamber is used to detect the recoiling He-4 nuclei. We measure beam-spin asymmetries larger than those observed on the free proton in the same kinematic domain. From these, we are able to extract, in a model-independent way, the real and imaginary parts of the only He-4 Compton form factor, HA. This first measurement of coherent deeply virtual Compton scattering on the He-4 nucleus, with a fully exclusive final state via nuclear recoil tagging, leads the way toward 3D imaging of the partonic structure of nuclei.
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