Determination of the beam-spin asymmetry of deuteron photodisintegration in the energy region Eγ=1.1 -2.3 GeV
Journal
Physical Review C - Nuclear Physics
Date Issued
2015-05-13
Author(s)
Zachariou, N.
Ilieva, Y.
Berman, B. L.
Ivanov, N. Ya
Sargsian, M. M.
Avakian, R.
Feldman, G.
Nadel-Turonski, P.
Adhikari, K. P.
Adikaram, D.
Anderson, M. D.
Pereira, S. Anefalos
Avakian, H.
Badui, R. A.
Baltzell, N. A.
Battaglieri, M.
Baturin, V.
Bedlinskiy, I.
Biselli, A. S.
Briscoe, W. J.
Burkert, V. D.
Cao, T.
Carman, D. S.
Celentano, A.
Chandavar, S.
Charles, G.
Colaneri, L.
Cole, P. L.
Compton, N.
Contalbrigo, M.
Cortes, O.
Crede, V.
D'Angelo, A.
De Vita, R.
De Sanctis, E.
Deur, A.
Djalali, C.
Dupre, R.
Egiyan, H.
Fassi, L. El
Elouadrhiri, L.
Fedotov, G.
Fegan, S.
Filippi, A.
Fleming, J. A.
Forest, T. A.
Fradi, A.
Gevorgyan, N.
Ghandilyan, Y.
Gilfoyle, G. P.
Giovanetti, K. L.
Girod, F. X.
Glazier, D. I.
Golovatch, E.
Gothe, R. W.
Griffioen, K. A.
Guidal, M.
Hafidi, K.
Hanretty, C.
Harrison, N.
Hattawy, M.
Hicks, K.
Ho, D.
Holtrop, M.
Hughes, S. M.
Ireland, D. G.
Ishkhanov, B. S.
Isupov, E. L.
Jiang, H.
Jo, H. S.
Joo, K.
Keller, D.
Khachatryan, G.
Khandaker, M.
Kim, A.
Kim, W.
Klein, F. J.
Kubarovsky, V.
Lenisa, P.
Livingston, K.
Lu, H. Y.
Macgregor, I. J.D.
Markov, N.
Mattione, P. T.
McKinnon, B.
Mineeva, T.
Mirazita, M.
Mokeeev, V. I.
Montgomery, R. A.
Moutarde, H.
Camacho, C. Munoz
Net, L. A.
Niccolai, S.
Niculescu, G.
Niculescu, I.
Osipenko, M.
Ostrovidov, A. I.
Park, K.
DOI
10.1103/PhysRevC.91.055202
Abstract
The beam-spin asymmetry, , for the reaction γ d → pn has been measured using the CEBAF Large
Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility (JLab) for six
photon-energy bins, between 1.1 and 2.3 GeV, and proton angles in the center-of-mass frame, θc.m., between
25◦ and 160◦. These are the first measurements of beam-spin asymmetries at θc.m. = 90◦ for photon-beam
energies above 1.6 GeV, and the first measurements for angles other than θc.m. = 90◦. The angular and energy
dependence of is expected to aid in the development of QCD-based models to understand the mechanisms of
deuteron photodisintegration in the transition region between hadronic and partonic degrees of freedom, where
both effective field theories and perturbative QCD cannot make reliable predictions.
Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility (JLab) for six
photon-energy bins, between 1.1 and 2.3 GeV, and proton angles in the center-of-mass frame, θc.m., between
25◦ and 160◦. These are the first measurements of beam-spin asymmetries at θc.m. = 90◦ for photon-beam
energies above 1.6 GeV, and the first measurements for angles other than θc.m. = 90◦. The angular and energy
dependence of is expected to aid in the development of QCD-based models to understand the mechanisms of
deuteron photodisintegration in the transition region between hadronic and partonic degrees of freedom, where
both effective field theories and perturbative QCD cannot make reliable predictions.
Subjects
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