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Measurement of deeply virtual compton scattering with a polarized-proton target |
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| Authors: | Chen S Avakian H Burkert V D Eugenio P Adams G Amarian M Ambrozewicz P Anghinolfi M Asryan G Bagdasaryan H Baillie N Ball J P Baltzell N A Barrow S Batourine V Battaglieri M Beard K Bedlinskiy I Bektasoglu M Bellis M Benmouna N Berman B L Biselli A S Bonner B E Bouchigny S Boiarinov S Bosted P Bradford R Branford D Briscoe W J Brooks W K Bültmann S Butuceanu C Calarco J R Careccia S L Carman D S Carnahan B Cazes A Cole P L Collins P Coltharp P Cords D Corvisiero P Crabb D Crannell H Crede V Cummings J P DeMasi R DeVita R De Sanctis E Degtyarenko P V Denizli H Dennis L Deur A Dharmawardane K V |
| Institution: | Florida State University, Tallahassee, Florida 32306, USA. |
| Abstract: | The longitudinal target-spin asymmetry AUL for the exclusive electroproduction of high-energy photons was measured for the first time in ep-->e;'pgamma. 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 sinvarphi moment is 0.252+/-0.042stat+/-0.020sys. 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 and H. |
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