The European Physical Journal A
Positron initiated deeply virtual Compton scattering (DVCS) off 4He and 3He nuclei is described. The way the so-called d-term could be obtained from the real part of the relevant Compton form factor is summarized, and the importance and novelty of this measurement is discussed. The measurements addressed for 3He targets could be very useful even in a standard unpolarized target setup, measuring beam spin and beam charge asymmetries only. The unpolarized beam charge asymmetries for DVCS off 3He and 4He are also estimated, at JLab kinematics and, for 4He, also at a configuration typical at the future Electron-Ion Collider. Incoherent DVCS processes, in particular the ones with tagging the internal target by measuring slow recoiling nuclei, and the unique possibility offered by positron beams for the investigation of Compton form factors of higher twist, are also briefly addressed.
Original Publication Citation
Fucini, S., Hattawy, M., Rinaldi, M., & Scopetta, S. (2021). Deeply virtual Compton scattering off Helium nuclei with positron beams. European Physical Journal A, 57(9), Article 273. https://doi.org/10.1140/epja/s10050-021-00580-y
Fucini, Sara; Hattawy, Mohammad; Rinaldi, Matteo; and Scopetta, Segio, "Deeply Virtual Compton Scattering Off Helium Nuclei with Positron Beams" (2021). Physics Faculty Publications. 566.