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

被引：123

作者：

Chen, S. ^{[1
]}

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.

Bultmann, 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.

De Masi, R.

DeVita, R.

De Sanctis, E.

机构：

[1] Florida State Univ, Tallahassee, FL 32306 USA

[2] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[3] Argonne Natl Lab, Argonne, IL 60439 USA

[4] Arizona State Univ, Tempe, AZ 85287 USA

[5] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[6] Calif State Univ Dominguez Hills, Carson, CA 90747 USA

[7] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[8] Catholic Univ Amer, Washington, DC 20064 USA

[9] CEA Saclay, Serv Phys Nucl, F-91191 Gif Sur Yvette, France

[10] Christopher Newport Univ, Newport News, VA 23606 USA

[11] Univ Connecticut, Storrs, CT 06269 USA

[12] Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland

[13] Florida Int Univ, Miami, FL 33199 USA

[14] George Washington Univ, Washington, DC 20052 USA

[15] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland

[16] Idaho State Univ, Pocatello, ID 83209 USA

[17] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[18] Ist Nazl Fis Nucl, Sez Genoa, I-16146 Genoa, Italy

[19] Inst Phys Nucl, F-91406 Orsay, France

[20] Inst Theoret & Expt Phys, Moscow 117259, Russia

[21] James Madison Univ, Harrisonburg, VA 22807 USA

[22] Kyungpook Natl Univ, Taegu 702701, South Korea

[23] MIT, Cambridge, MA 02139 USA

[24] Univ Massachusetts, Amherst, MA 01003 USA

[25] Moscow MV Lomonosov State Univ, Gen Nucl Phys Inst, Moscow 119899, Russia

[26] Univ New Hampshire, Durham, NH 03824 USA

[27] Norfolk State Univ, Norfolk, VA 23504 USA

[28] Ohio Univ, Athens, OH 45701 USA

[29] Old Dominion Univ, Norfolk, VA 23529 USA

[30] Univ Pittsburgh, Pittsburgh, PA 15260 USA

[31] Rensselaer Polytech Inst, Troy, NY 12180 USA

[32] Rice Univ, Houston, TX 77005 USA

[33] Univ Richmond, Richmond, VA 23173 USA

[34] Univ S Carolina, Columbia, SC 29208 USA

[35] Union Coll, Schenectady, NY 12308 USA

[36] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

[37] Univ Virginia, Charlottesville, VA 22901 USA

[38] Coll William & Mary, Williamsburg, VA 23187 USA

[39] Yerevan Phys Inst, Yerevan 375036, Armenia

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.97.072002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

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