First Exclusive Measurement of Deeply Virtual Compton Scattering off He 4: Toward the 3D Tomography of Nuclei
Genre
Pre-printDate
2017-11-15Author
Hattawy, MBaltzell, NA
Dupré, R
Hafidi, K
Stepanyan, S
Bültmann, S
De Vita, R
El Alaoui, A
El Fassi, L
Egiyan, H
Girod, FX
Guidal, M
Jenkins, D
Liuti, S
Perrin, Y
Torayev, B
Voutier, E
Adhikari, KP
Adhikari, S
Adikaram, D
Akbar, Z
Amaryan, MJ
Anefalos Pereira, S
Armstrong, WR
Avakian, H
Ball, J
Bashkanov, M
Battaglieri, M
Batourine, V
Bedlinskiy, I
Biselli, AS
Boiarinov, S
Briscoe, WJ
Brooks, WK
Burkert, VD
Thanh Cao, F
Carman, DS
Celentano, A
Charles, G
Chetry, T
Ciullo, G
Clark, L
Colaneri, L
Cole, PL
Contalbrigo, M
Cortes, O
Crede, V
D'Angelo, A
Dashyan, N
De Sanctis, E
Deur, A
Djalali, C
Elouadrhiri, L
Eugenio, P
Fedotov, G
Fegan, S
Fersch, R
Filippi, A
Fleming, JA
Forest, TA
Fradi, A
Garçon, M
Gevorgyan, N
Ghandilyan, Y
Gilfoyle, GP
Giovanetti, KL
Gleason, C
Gohn, W
Golovatch, E
Gothe, RW
Griffioen, KA
Guo, L
Hakobyan, H
Hanretty, C
Harrison, N
Heddle, D
Hicks, K
Holtrop, M
Hughes, SM
Ireland, DG
Ishkhanov, BS
Isupov, EL
Jiang, H
Joo, K
Joosten, S
Keller, D
Khachatryan, G
Khachatryan, M
Khandaker, M
Kim, A
Kim, W
Klein, A
Klein, FJ
Kubarovsky, V
Kuhn, SE
Kuleshov, SV
Lanza, L
Lenisa, P
Livingston, K
Lu, HY
Subject
CLAS CollaborationPermanent link to this record
http://hdl.handle.net/20.500.12613/4852
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Show full item recordDOI
10.1103/PhysRevLett.119.202004Abstract
© 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.Citation to related work
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http://dx.doi.org/10.34944/dspace/4834