Beam-charge azimuthal asymmetry and deeply virtual Compton scattering

被引：92
作者：
Airapetian, A. [1 ]
Akopov, N.
Akopov, Z.
Amarian, M.
Andrus, A.
Aschenauer, E. C.
Augustyniak, W.
Avakian, R.
Avetissian, A.
Avetissian, E.
Bailey, P.
Balin, D.
Beckmann, M.
Belostotski, S.
Bianchi, N.
Blok, H. P.
Boettcher, H.
Borissov, A.
Borysenko, A.
Bouwhuis, M.
Bruell, A.
Bryzgalov, V.
Capiluppi, M.
Capitani, G. P.
Chen, T.
Ciullo, G.
Contalbrigo, M.
Dalpiaz, P. F.
Deconinck, W.
De Leo, R.
Demey, M.
De Nardo, L.
De Sanctis, E.
Devitsin, E.
Di Nezza, P.
Dreschler, J.
Dueren, M.
Ehrenfried, M.
Elalaoui-Moulay, A.
Elbakian, G.
Ellinghaus, F.
Elschenbroich, U.
Fabbri, R.
Fantoni, A.
Felawka, L.
Frullani, S.
Funel, A.
Gapienko, G.
Gapienko, V.
Garibaldi, F.
机构：
[1] Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA
[2] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada
[3] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA
[4] Ist Nazl Fis Nucl, Sez Bari, I-70124 Bari, Italy
[5] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
[6] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China
[7] Univ Colorado, Nucl Phys Lab, Boulder, CO 80309 USA
[8] DESY, D-22603 Hamburg, Germany
[9] DESY, D-15738 Zeuthen, Germany
[10] Joint Inst Nucl Res, Dubna 141980, Russia
[11] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany
[12] Univ Ferrara, Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy
[13] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy
[14] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[15] Univ Ghent, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium
[16] Univ Giessen, Inst Phys, D-35392 Giessen, Germany
[17] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
[18] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[19] PN Lebedev Phys Inst, Moscow 117924, Russia
[20] NIKHEF, NL-1009 DB Amsterdam, Netherlands
[21] Petersburg Nucl Phys Inst, Gatchina 188350, Russia
[22] Inst High Energy Phys, Protvino 142281, Moscow Region, Russia
[23] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany
[24] Ist Super Sanita, Ist Nazl Fis Nucl, Sez Roma 1, Grp Sanita, I-00161 Rome, Italy
[25] Ist Super Sanita, Phys Lab, I-00161 Rome, Italy
[26] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada
[27] TRIUMF, Vancouver, BC V6T 2A3, Canada
[28] Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan
[29] Vrije Univ, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands
[30] Andrzej Soltan Inst Nucl Studies, PL-00689 Warsaw, Poland
[31] Yerevan Phys Inst, Yerevan 375036, Armenia
来源：
PHYSICAL REVIEW D | 2007年 / 75卷 / 01期
关键词：
D O I：
10.1103/PhysRevD.75.011103
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The first observation of an azimuthal cross section asymmetry with respect to the charge of the incoming lepton beam is reported from a study of hard exclusive electroproduction of real photons. The data have been accumulated by the HERMES experiment at DESY, in which the HERA 27.6 GeV electron or positron beam scattered off an unpolarized hydrogen gas target. The observed asymmetry is attributed to the interference between the Bethe-Heitler process and the deeply virtual Compton scattering (DVCS) process. The interference term is sensitive to DVCS amplitudes, which provide the most direct access to generalized parton distributions.
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页数：5
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