Journal article
Authors list: Dupre, R.; Hattawy, M.; Baltzell, N. A.; Bultmann, S.; De Vita, R.; El Alaoui, A.; El Fassi, L.; Egiyan, H.; Girod, F. X.; Guidal, M.; Hafidi, K.; Jenkins, D.; Liuti, S.; Perrin, Y.; Stepanyan, S.; Torayev, B.; Voutier, E.; Amaryan, M. J.; Armstrong, W. R.; Atac, H.; Gayoso, C. Ayerbe; Barion, L.; Battaglieri, M.; Bedlinskiy, I; Benmokhtar, F.; Bianconi, A.; Biselli, A. S.; Bondi, M.; Bossu, F.; Boiarinov, S.; Briscoe, W. J.; Bulumulla, D.; Burkert, V; Carman, D. S.; Carvajal, J. C.; Caudron, M.; Celentano, A.; Chatagnon, P.; Chesnokov, V; Chetry, T.; Ciullo, G.; Clary, B. A.; Cole, P. L.; Contalbrigo, M.; Costantini, G.; Crede, V; D'Angelo, A.; Dashyan, N.; Defurne, M.; Deur, A.; Diehl, S.; Djalali, C.; Ehrhart, M.; Elouadrhiri, L.; Eugenio, P.; Fegan, S.; Filippi, A.; Forest, T. A.; Ghandilyan, Y.; Gilfoyle, G. P.; Gothe, R. W.; Griffioen, K. A.; Hakobyan, H.; Hayward, T. B.; Hicks, K.; Hobart, A.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Isupov, E. L.; Jo, H. S.; Joo, K.; Joosten, S.; Keller, D.; Khachatryan, G.; Khanal, A.; Khandaker, M.; Kim, A.; Kim, W.; Kripko, A.; Kubarovsky, V; Kuhn, S. E.; Lanza, L.; Livingston, K.; Kabir, M. L.; Leali, M.; Lenisa, P.; MacGregor, I. J. D.; Marchand, D.; Markov, N.; Mascagna, V; Mayer, M.; McKinnon, B.; Mirazita, M.; Mokeev, V., I; Neupane, K.; Niccolai, S.; O'Connell, T. R.; Osipenko, M.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Pasyuk, E.; Payette, D.; Phelps, W.; Pivnyuk, N.; Pogorelko, O.; Poudel, J.; Prok, Y.; Ripani, M.; Ritman, J.; Rizzo, A.; Rosner, G.; Rossi, P.; Rowley, J.; Sabatie, F.; Salgado, C.; Schmidt, A.; Schumacher, R.; Sergeyeva, V; Sharabian, Y.; Shrestha, U.; Sokhan, D.; Soto, O.; Sparveris, N.; Strakovsky, I. I.; Strauch, S.; Tyler, N.; Ungaro, M.; Venturelli, L.; Voskanyan, H.; Vossen, A.; Watts, D.; Wei, K.; Wei, X.; Weinstein, L. B.; Wishart, R.; Wood, M. H.; Yale, B.; Zachariou, N.; Zhang, J.
Publication year: 2021
Journal: Physical Review C
Volume number: 104
Issue number: 2
ISSN: 2469-9985
eISSN: 2469-9993
DOI Link: https://doi.org/10.1103/PhysRevC.104.025203
Publisher: American Physical Society
Abstract:
We report on the measurement of the beam spin asymmetry in the deeply virtual Compton scattering off He-4 using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab using a 6 GeV longitudinally polarized electron beam incident on a pressurized He-4 gaseous target. We detail the method used to ensure the exclusivity of the measured reactions, in particular the upgrade of CLAS with a radial time projection chamber to detect the low-energy recoiling He-4 nuclei and an inner calorimeter to extend the photon detection acceptance at forward angles. Our results confirm the theoretically predicted enhancement of the coherent (e(4)He -> e'4He'gamma') beam spin asymmetries compared to those observed on the free proton, while the incoherent (e(4)He -> e'p'gamma'X') asymmetries exhibit a 30% suppression. From the coherent data, we were able to extract, in a model-independent way, the real and imaginary parts of the only He-4 Compton form factor, H-A, leading the way toward 3D imaging of the partonic structure of nuclei.
Citation Styles
Harvard Citation style: Dupre, R., Hattawy, M., Baltzell, N., Bultmann, S., De Vita, R., El Alaoui, A., et al. (2021) Measurement of deeply virtual Compton scattering off 4He with the CEBAF Large Acceptance Spectrometer at Jefferson Lab, Physical Review C (nuclear physics), 104(2), Article 025203. https://doi.org/10.1103/PhysRevC.104.025203
APA Citation style: Dupre, R., Hattawy, M., Baltzell, N., Bultmann, S., De Vita, R., El Alaoui, A., El Fassi, L., Egiyan, H., Girod, F., Guidal, M., Hafidi, K., Jenkins, D., Liuti, S., Perrin, Y., Stepanyan, S., Torayev, B., Voutier, E., Amaryan, M., Armstrong, W., ...Zhang, J. (2021). Measurement of deeply virtual Compton scattering off 4He with the CEBAF Large Acceptance Spectrometer at Jefferson Lab. Physical Review C (nuclear physics). 104(2), Article 025203. https://doi.org/10.1103/PhysRevC.104.025203
Keywords
CHAMBER; CLAS
