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.

Chen, S

Avakian, H

Burkert, VD

Eugenio, P

Adams, G

Amarian, M

Ambrozewicz, P

Anghinolfi, M

Asryan, G

Bagdasaryan, H

Baillie, N

Ball, JP

Baltzell, NA

Barrow, S

Batourine, V

Battaglieri, M

Beard, K

Bedlinskiy, I

Bektasoglu, M

Bellis, M

Benmouna, N

Berman, BL

Biselli, AS

Bonner, BE

Bouchigny, S

Boiarinov, S

Bosted, P

Bradford, R

Branford, D

Briscoe, WJ

Brooks, WK

Bültmann, S

Butuceanu, C

Calarco, JR

Careccia, SL

Carman, DS

Carnahan, B

Cazes, A

Cole, PL

Collins, P

Coltharp, P

Cords, D

Corvisiero, P

Crabb, D

Crannell, H

Crede, V

Cummings, JP

DeMasi, R

DeVita, R

De Sanctis, E

Degtyarenko, PV

Denizli, H

Dennis, L

Deur, A

Dharmawardane, KV

Dhuga, KS

Djalali, C

Dodge, GE

Donnelly, J

Doughty, D

Dugger, M

Dytman, S

Dzyubak, OP

Egiyan, H

Egiyan, KS

El Fassi, L

Elouadrhiri, L

Fatemi, R

Fedotov, G

Feldman, G

Feuerbach, RJ

Forest, TA

Funsten, H

Garçon, M

Gavalian, G

Gilfoyle, GP

Giovanetti, KL

Girod, FX

Goetz, JT

Golovatch, E

Gonenc, A

Gothe, RW

Griffioen, KA

Guidal, M

Guillo, M

Guler, N

Guo, L

Gyurjyan, V

Hadjidakis, C

Hafidi, K

Hakobyan, H

Hakobyan, RS

Hardie, J

Heddle, D

Hersman, FW

Hicks, K

Hleiqawi, I

Holtrop, Maurik

Huertas, M

Hyde-Wright, CE

Ilieva, Y

Ireland, DG

Ishkhanov, BS

Isupov, EL

Ito, MM

Jenkins, D

Jo, HS

Joo, K

Juengst, HG

Keith, C

Kellie, JD

Khandaker, M

Kim, KY

Kim, K

Kim, W

Klein, A

Klein, FJ

Klusman, M

Kossov, M

Kramer, LH

Kubarovsky, V

Kuhn, J

Kuhn, SE

Kuleshov, SV

Lachniet, J

Laget, JM

Langheinrich, J

Lawrence, D

Li, Ji

Lima, ACS

Livingston, K

Lu, H

Lukashin, K

MacCormick, M

Markov, N

McAleer, S

McKinnon, B

McNabb, JWC

Mecking, BA

Mestayer, MD

Meyer, CA

Mibe, T

Mikhailov, K

Minehart, R

Mirazita, M

Miskimen, R

Mokeev, V

Morand, L

Morrow, SA

Moteabbed, M

Mueller, J

Mutchler, GS

Nadel-Turonski, P

Napolitano, J

Nasseripour, R

Natasha, N

Niccolai, S

Niculescu, G

Niculescu, I

Niczyporuk, BB

Niroula, MR

Niyazov, RA

Nozar, M

O'Rielly, GV

Osipenko, M

Ostrovidov, AI

Park, K

Pasyuk, E

Paterson, C

Philips, SA

Pierce, J

Pivnyuk, N

Pocanic, D

Pogorelko, O

Polli, E

Popa, I

Pozdniakov, S

Preedom, BM

Price, JW

Prok, Y

Protopopescu, D

Qin, LM

Raue, BA

Riccardi, G

Ricco, G

Ripani, M

Ritchie, BG

Ronchetti, F

Rosner, G

Rossi, P

Rowntree, D

Rubin, PD

Sabatié, F

Salgado, C

Santoro, JP

Sapunenko, V

Schumacher, RA

Serov, VS

Sharabian, YG

Shaw, J

Shvedunov, NV

Skabelin, AV

Smith, ES

Smith, LC

Sober, DI

Stavinsky, A

Stepanyan, SS

Stepanyan, S

Stokes, BE

Stoler, P

Strakovsky, II

Strauch, S

Suleiman, R

Taiuti, M

Tedeschi, DJ

Thoma, U

Tkabladze, A

Tkachenko, S

Todor, L

Tur, C

Ungaro, M

Vanderhaeghen, M

Vineyard, MF

Vlassov, AV

Watts, DP

Weinstein, LB

Weygand, DP

Williams, M

Wolin, E

Wood, MH

Yegneswaran, A

Yun, J

Zana, L

Zhang, J

Zhao, B

Zhao, Z

CLAS Collaboration

published 

August 18, 2006

General Physics

Physical Review Letters  Journal