First Exclusive Measurement of Deeply Virtual Compton Scattering off 4He: Toward the 3D Tomography of Nuclei

被引：25

作者：

Hattawy, M. ^{[1
,22
,23
]}

Baltzell, N. A. ^{[1
]}

Dupre, R. ^{[1
,22
,23
]}

Hafidi, K. ^{[1
]}

Stepanyan, S. ^{[38
]}

Bultmann, S. ^{[32
]}

De Vita, R. ^{[19
]}

El Alaoui, A. ^{[1
,39
]}

El Fassi, L. ^{[28
]}

Egiyan, H. ^{[38
]}

Girod, F. X. ^{[38
]}

Guidal, M. ^{[22
,23
]}

Jenkins, D. ^{[43
]}

Liuti, S. ^{[42
]}

Perrin, Y. ^{[27
]}

Torayev, B. ^{[32
]}

Voutier, E. ^{[22
,23
,27
]}

Adhikari, K. P. ^{[28
]}

Adhikari, S. ^{[12
]}

Adikaram, D. ^{[32
,38
]}

Akbar, Z. ^{[13
]}

Amaryan, M. J. ^{[32
]}

Pereira, S. Anefalos ^{[18
]}

Armstrong, Whitney R. ^{[1
]}

Avakian, H. ^{[38
]}

Ball, J. ^{[7
]}

Bashkanov, M. ^{[40
]}

Battaglieri, M. ^{[19
]}

Batourine, V. ^{[38
]}

Bedlinskiy, I. ^{[24
]}

Biselli, A. S. ^{[10
]}

Boiarinov, S. ^{[38
]}

Briscoe, W. J. ^{[15
]}

Brooks, W. K. ^{[39
]}

Burkert, V. D. ^{[38
]}

Cao, Frank Thanh ^{[9
]}

Carman, D. S. ^{[38
]}

Celentano, A. ^{[19
,20
]}

Charles, G. ^{[32
]}

Chetry, T. ^{[31
]}

Ciullo, G. ^{[11
,17
]}

Clark, L. ^{[41
]}

Colaneri, L. ^{[22
,23
]}

Cole, P. L. ^{[16
]}

Contalbrigo, M. ^{[17
]}

Cortes, O. ^{[16
]}

Crede, V. ^{[13
]}

D'Angelo, A. ^{[20
,34
]}

Dashyan, N. ^{[45
]}

De Sanctis, E. ^{[18
]}

机构：

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

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

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

[4] Canisius Coll, Buffalo, NY 14208 USA

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

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

[7] Univ Paris Saclay, CEA, Irfu SPhN, F-91191 Gif Sur Yvette, France

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

[9] Univ Connecticut, Storrs, CT 06269 USA

[10] Fairfield Univ, Fairfield, CT 06824 USA

[11] Univ Ferrara, I-44121 Ferrara, Italy

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

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

[14] Univ Genoa, I-16146 Genoa, Italy

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

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

[17] INFN, Sez Ferrara, I-44100 Ferrara, Italy

[18] INFN, Lab Nazl Frascati, I-00044 Frascati, Italy

[19] INFN, Sez Genova, I-16146 Genoa, Italy

[20] INFN, Sez Roma Tor Vergata, I-00133 Rome, Italy

[21] INFN, Sez Torino, I-10125 Turin, Italy

[22] CNRS, IN2P3, Inst Phys Nucl, F-91406 Orsay, France

[23] Univ Paris 11, F-91406 Orsay, France

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

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

[26] Kyungpook Natl Univ, Daegu 41566, South Korea

[27] Univ Grenoble Alpes, CNRS, IN2P3, LPSC, F-38026 Grenoble, France

[28] Mississippi State Univ, Mississippi State, MS 39762 USA

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

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

[31] Ohio Univ, Athens, OH 45701 USA

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

[33] Univ Richmond, Richmond, VA 23173 USA

[34] Univ Roma Tor Vergata, I-00133 Rome, Italy

[35] Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119234, Russia

[36] Univ South Carolina, Columbia, SC 29208 USA

[37] Temple Univ, Philadelphia, PA 19122 USA

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

[39] Univ Tecn Federico Santa Maria, Casilla 110-5, Valparaiso, Chile

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

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

[42] Univ Virginia, Charlottesville, VA 22901 USA

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

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

[45] Yerevan Phys Inst, Yerevan 375036, Armenia

[46] Dept Phys, Fac Sci Gabes, Gabes 6072, Tunisia

[47] Univ Kentucky, Lexington, KY 40506 USA

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 20期

基金：

新加坡国家研究基金会; 美国国家科学基金会; 美国能源部; 英国科学技术设施理事会;

关键词：

GENERALIZED PARTON DISTRIBUTIONS; ELECTROPRODUCTION; PHOTONS; MESONS; HERA;

D O I：

10.1103/PhysRevLett.119.202004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment uses the 6 GeV electron beam from the Continuous Electron Beam Accelerator Facility (CEBAF) accelerator at Jefferson Lab incident on a pressurized He-4 gaseous target placed in front of the CEBAF Large Acceptance Spectrometer (CLAS). The scattered electron is detected by CLAS and the photon by a dedicated electromagnetic calorimeter at forward angles. To ensure the exclusivity of the process, a specially designed radial time projection chamber is used to detect the recoiling He-4 nuclei. We measure beam-spin asymmetries larger than those observed on the free proton in the same kinematic domain. From these, we are able to extract, in a model-independent way, the real and imaginary parts of the only He-4 Compton form factor, HA. This first measurement of coherent deeply virtual Compton scattering on the He-4 nucleus, with a fully exclusive final state via nuclear recoil tagging, leads the way toward 3D imaging of the partonic structure of nuclei.

引用

页数：7

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