Longitudinal target-spin asymmetries for deeply virtual compton scattering
Journal
Physical Review Letters
Date Issued
2015-01-22
Author(s)
Seder, E.
Biselli, A.
Pisano, S.
Niccolai, S.
Smith, G. D.
Joo, K.
Adhikari, K.
Amaryan, M. J.
Anderson, M. D.
Anefalos Pereira, S.
Avakian, H.
Battaglieri, M.
Bedlinskiy, I.
Bono, J.
Boiarinov, S.
Bosted, P.
Briscoe, W.
Brock, J.
Bültmann, S.
Burkert, V. D.
Carman, D. S.
Carlin, C.
Celentano, A.
Chandavar, S.
Charles, G.
Colaneri, L.
Cole, P. L.
Contalbrigo, M.
Crabb, D.
Crede, V.
D'Angelo, A.
Dashyan, N.
De Vita, R.
De Sanctis, E.
Deur, A.
Djalali, C.
Doughty, D.
Dupre, R.
El Fassi, L.
Elouadrhiri, L.
Eugenio, P.
Fedotov, G.
Fegan, S.
Filippi, A.
Fleming, J. A.
Fradi, A.
Garillon, B.
Garçon, M.
Gevorgyan, N.
Ghandilyan, Y.
Giovanetti, K. L.
Girod, F. X.
Goetz, J. T.
Gohn, W.
Gothe, R. W.
Griffioen, K. A.
Guegan, B.
Guidal, M.
Guo, L.
Hafidi, K.
Hanretty, C.
Harrison, N.
Hattawy, M.
Hirlinger Saylor, N.
Holtrop, M.
Hughes, S. M.
Ilieva, Y.
Ireland, D. G.
Ishkhanov, B. S.
Isupov, E. L.
Jo, H. S.
Joosten, S.
Keith, C. D.
Keller, D.
Khachatryan, G.
Khandaker, M.
Kim, A.
Kim, W.
Klein, A.
Klein, F. J.
Koirala, S.
Kubarovsky, V.
Kuhn, S. E.
Lenisa, P.
Livingston, K.
Lu, H. Y.
Macgregor, I. J.D.
Markov, N.
Mayer, M.
McKinnon, B.
Meekins, D. G.
Mirazita, M.
Mokeev, V.
Montgomery, R.
Moody, C. I.
Moutarde, H.
Movsisyan, A.
DOI
10.1103/PhysRevLett.114.032001
Abstract
A measurement of the electroproduction of photons off protons in the deeply inelastic regime was
performed at Jefferson Lab using a nearly 6 GeV electron beam, a longitudinally polarized proton target,
and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep → e0
p0
γ events, which
arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler processes, were
extracted over the widest kinematics in Q2, xB, t, and ϕ, for 166 four-dimensional bins. In the framework of
generalized parton distributions, at leading twist the t dependence of these asymmetries provides insight
into the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center.
These results also bring important and necessary constraints for the existing parametrizations of chiral-even
generalized parton distributions.
performed at Jefferson Lab using a nearly 6 GeV electron beam, a longitudinally polarized proton target,
and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep → e0
p0
γ events, which
arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler processes, were
extracted over the widest kinematics in Q2, xB, t, and ϕ, for 166 four-dimensional bins. In the framework of
generalized parton distributions, at leading twist the t dependence of these asymmetries provides insight
into the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center.
These results also bring important and necessary constraints for the existing parametrizations of chiral-even
generalized parton distributions.
Subjects
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