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Measurement of deeply virtual Compton scattering off He 4 with the CEBAF Large Acceptance Spectrometer at Jefferson Lab

Publication ,  Journal Article
Dupré, R; Hattawy, M; Baltzell, NA; Bültmann, S; De Vita, R; El Alaoui, A; El Fassi, L; Egiyan, H; Girod, FX; Guidal, M; Hafidi, K; Jenkins, D ...
Published in: Physical Review C
August 1, 2021
Published version (DOI)

We report on the measurement of the beam spin asymmetry in the deeply virtual Compton scattering off He4 using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab using a 6 GeV longitudinally polarized electron beam incident on a pressurized He4 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 He4 nuclei and an inner calorimeter to extend the photon detection acceptance at forward angles. Our results confirm the theoretically predicted enhancement of the coherent (eHe4→e′He4′γ′) beam spin asymmetries compared to those observed on the free proton, while the incoherent (eHe4→e′p′γ′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 He4 Compton form factor, HA, leading the way toward 3D imaging of the partonic structure of nuclei.

Duke Scholars

Anselm G. Vossen
Author Anselm G. Vossen Physics
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Published In

Physical Review C

DOI

10.1103/PhysRevC.104.025203

EISSN

2469-9993

ISSN

2469-9985

Publication Date

August 1, 2021

Volume

104

Issue

2

Related Subject Headings

  • 5106 Nuclear and plasma physics
 

Citation

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MLA
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Dupré, R., Hattawy, M., Baltzell, N. A., Bültmann, S., De Vita, R., El Alaoui, A., … Paolone, M. (2021). Measurement of deeply virtual Compton scattering off He 4 with the CEBAF Large Acceptance Spectrometer at Jefferson Lab. Physical Review C, 104(2). https://doi.org/10.1103/PhysRevC.104.025203
Dupré, R., M. Hattawy, N. A. Baltzell, S. Bültmann, R. De Vita, A. El Alaoui, L. El Fassi, et al. “Measurement of deeply virtual Compton scattering off He 4 with the CEBAF Large Acceptance Spectrometer at Jefferson Lab.” Physical Review C 104, no. 2 (August 1, 2021). https://doi.org/10.1103/PhysRevC.104.025203.
Dupré R, Hattawy M, Baltzell NA, Bültmann S, De Vita R, El Alaoui A, et al. Measurement of deeply virtual Compton scattering off He 4 with the CEBAF Large Acceptance Spectrometer at Jefferson Lab. Physical Review C. 2021 Aug 1;104(2).
Dupré, R., et al. “Measurement of deeply virtual Compton scattering off He 4 with the CEBAF Large Acceptance Spectrometer at Jefferson Lab.” Physical Review C, vol. 104, no. 2, Aug. 2021. Scopus, doi:10.1103/PhysRevC.104.025203.
Dupré R, Hattawy M, Baltzell NA, Bültmann S, De Vita R, El Alaoui A, El Fassi L, Egiyan H, Girod FX, Guidal M, Hafidi K, Jenkins D, Liuti S, Perrin Y, Stepanyan S, Torayev B, Voutier E, Amaryan MJ, Armstrong WR, Atac H, Ayerbe Gayoso C, Barion L, Battaglieri M, Bedlinskiy I, Benmokhtar F, Bianconi A, Biselli AS, Bondi M, Bossù F, Boiarinov S, Briscoe WJ, Bulumulla D, Burkert V, Carman DS, Carvajal JC, Caudron M, Celentano A, Chatagnon P, Chesnokov V, Chetry T, Ciullo G, Clary BA, Cole PL, 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 TA, Ghandilyan Y, Gilfoyle GP, Gothe RW, Griffioen KA, Hakobyan H, Hayward TB, Hicks K, Hobart A, Holtrop M, Ilieva Y, Ireland DG, Isupov EL, Jo HS, Joo K, Joosten S, Keller D, Khachatryan G, Khanal A, Khandaker M, Kim A, Kim W, Kripko A, Kubarovsky V, Kuhn SE, Lanza L, Livingston K, Kabir ML, Leali M, Lenisa P, Macgregor IJD, Marchand D, Markov N, Mascagna V, Mayer M, McKinnon B, Mirazita M, Mokeev VI, Neupane K, Niccolai S, O’Connell TR, Osipenko M, Paolone M. Measurement of deeply virtual Compton scattering off He 4 with the CEBAF Large Acceptance Spectrometer at Jefferson Lab. Physical Review C. 2021 Aug 1;104(2).

Published In

Physical Review C

DOI

10.1103/PhysRevC.104.025203

EISSN

2469-9993

ISSN

2469-9985

Publication Date

August 1, 2021

Volume

104

Issue

2

Related Subject Headings

  • 5106 Nuclear and plasma physics