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. 2006 Aug 18;97(7):072002.
doi: 10.1103/PhysRevLett.97.072002. Epub 2006 Aug 18.

Measurement of deeply virtual compton scattering with a polarized-proton target

S Chen  1 , H Avakian, V D Burkert, P Eugenio, G Adams, M Amarian, P Ambrozewicz, M Anghinolfi, G Asryan, H Bagdasaryan, N Baillie, J P Ball, N A Baltzell, S Barrow, V Batourine, M Battaglieri, K Beard, I Bedlinskiy, M Bektasoglu, M Bellis, N Benmouna, B L Berman, A S Biselli, B E Bonner, S Bouchigny, S Boiarinov, P Bosted, R Bradford, D Branford, W J Briscoe, W K Brooks, S Bültmann, C Butuceanu, J R Calarco, S L Careccia, D S Carman, B Carnahan, A Cazes, P L Cole, P Collins, P Coltharp, D Cords, P Corvisiero, D Crabb, H Crannell, V Crede, J P Cummings, R DeMasi, R DeVita, E De Sanctis, P V Degtyarenko, H Denizli, L Dennis, A Deur, K V Dharmawardane, K S Dhuga, C Djalali, G E Dodge, J Donnelly, D Doughty, M Dugger, S Dytman, O P Dzyubak, H Egiyan, K S Egiyan, L El Fassi, L Elouadrhiri, R Fatemi, G Fedotov, G Feldman, R J Feuerbach, T A Forest, H Funsten, M Garçon, G Gavalian, G P Gilfoyle, K L Giovanetti, F X Girod, J T Goetz, E Golovatch, A Gonenc, R W Gothe, K A Griffioen, M Guidal, M Guillo, N Guler, L Guo, V Gyurjyan, C Hadjidakis, K Hafidi, H Hakobyan, R S Hakobyan, J Hardie, D Heddle, F W Hersman, K Hicks, I Hleiqawi, M Holtrop, M Huertas, C E Hyde-Wright, Y Ilieva, D G Ireland, B S Ishkhanov, E L Isupov, M M Ito, D Jenkins, H S Jo, K Joo, H G Juengst, C Keith, J D Kellie, M Khandaker, K Y Kim, K Kim, W Kim, A Klein, F J Klein, M Klusman, M Kossov, L H Kramer, V Kubarovsky, J Kuhn, S E Kuhn, S V Kuleshov, J Lachniet, J M Laget, J Langheinrich, D Lawrence, Ji Li, A C S Lima, K Livingston, H Lu, K Lukashin, M MacCormick, N Markov, S McAleer, B McKinnon, J W C McNabb, B A Mecking, M D Mestayer, C A Meyer, T Mibe, K Mikhailov, R Minehart, M Mirazita, R Miskimen, V Mokeev, L Morand, S A Morrow, M Moteabbed, J Mueller, G S Mutchler, P Nadel-Turonski, J Napolitano, R Nasseripour, N Natasha, S Niccolai, G Niculescu, I Niculescu, B B Niczyporuk, M R Niroula, R A Niyazov, M Nozar, G V O'Rielly, M Osipenko, A I Ostrovidov, K Park, E Pasyuk, C Paterson, S A Philips, J Pierce, N Pivnyuk, D Pocanic, O Pogorelko, E Polli, I Popa, S Pozdniakov, B M Preedom, J W Price, Y Prok, D Protopopescu, L M Qin, B A Raue, G Riccardi, G Ricco, M Ripani, B G Ritchie, F Ronchetti, G Rosner, P Rossi, D Rowntree, P D Rubin, F Sabatié, C Salgado, J P Santoro, V Sapunenko, R A Schumacher, V S Serov, Y G Sharabian, J Shaw, N V Shvedunov, A V Skabelin, E S Smith, L C Smith, D I Sober, A Stavinsky, S S Stepanyan, S Stepanyan, B E Stokes, P Stoler, I I Strakovsky, S Strauch, R Suleiman, M Taiuti, D J Tedeschi, U Thoma, A Tkabladze, S Tkachenko, L Todor, C Tur, M Ungaro, M Vanderhaeghen, M F Vineyard, A V Vlassov, D P Watts, L B Weinstein, D P Weygand, M Williams, E Wolin, M H Wood, A Yegneswaran, J Yun, L Zana, J Zhang, B Zhao, Z Zhao; CLAS Collaboration
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Free article

Measurement of deeply virtual compton scattering with a polarized-proton target

S Chen et al. Phys Rev Lett. .
Free article

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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