Measurement of deeply virtual compton scattering with a polarized-proton targetстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The longitudinal target-spin asymmetry A(UL) for the exclusive electroproduction of high-energy photons was measured for the first time in ep -> e(')p gamma. The data have been accumulated at JLab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized NH3 target. A significant azimuthal angular dependence was observed, resulting from the interference of the deeply virtual Compton scattering and Bethe-Heitler processes. The amplitude of the sin phi moment is 0.252 +/- 0.042(stat)+/- 0.020(sys). Theoretical calculations are in good agreement with the magnitude and the kinematic dependence of the target-spin asymmetry, which is sensitive to the generalized parton distributions (H) over tilde and H.