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First Exclusive Measurement of Deeply Virtual Compton Scattering off He 4: Toward the 3D Tomography of Nuclei
Hattawy, M Baltzell, NA Dupré, R Hafidi, K Stepanyan, S Bültmann, S De Vita, R El Alaoui, A El Fassi, L Egiyan, H
Hattawy, M
Baltzell, NA
Dupré, R
Hafidi, K
Stepanyan, S
Bültmann, S
De Vita, R
El Alaoui, A
El Fassi, L
Egiyan, H
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2017-11-15
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10.1103/PhysRevLett.119.202004
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© 2017 American Physical Society. 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 He4 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 He4 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 He4 Compton form factor, HA. This first measurement of coherent deeply virtual Compton scattering on the He4 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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Physical Review Letters
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