First Measurement of Hard Exclusive p- ? plus plus Electroproduction Beam-Spin Asymmetries off the Proton

被引：8

作者：

Diehl, S. ^{[6
,34
]}

Trotta, N. ^{[6
]}

Joo, K. ^{[6
]}

Achenbach, P. ^{[39
]}

Akbar, Z. ^{[12
,46
]}

Armstrong, W. R. ^{[1
]}

Atac, H. ^{[38
]}

Avakian, H. ^{[39
]}

Baashen, L. ^{[11
]}

Baltzell, N. A. ^{[39
]}

Barion, L. ^{[15
]}

Bashkanov, M. ^{[45
]}

Battaglieri, M. ^{[17
]}

Bedlinskiy, I. ^{[28
]}

Benmokhtar, F. ^{[8
]}

Bianconi, A. ^{[20
,42
]}

Biselli, A. S. ^{[9
]}

Bossu, F. ^{[4
]}

Brinkmann, K. -T. ^{[34
]}

Briscoe, W. J. ^{[13
]}

Bulumulla, D. ^{[33
]}

Burkert, V. ^{[39
]}

Capobianco, R. ^{[6
]}

Carman, D. S. ^{[39
]}

Carvajal, J. C. ^{[11
]}

Celentano, A. ^{[17
]}

Charles, G. ^{[21
,33
]}

Chatagnon, P. ^{[21
,39
]}

Chesnokov, V. ^{[36
]}

Ciullo, G. ^{[10
,15
]}

Cole, P. L. ^{[25
]}

Contalbrigo, M. ^{[15
]}

Costantini, G. ^{[20
,42
]}

Crede, V. ^{[12
]}

D'Angelo, A. ^{[18
,35
]}

Dashyan, N. ^{[48
]}

De Vita, R. ^{[17
]}

Deur, A. ^{[39
]}

Djalali, C. ^{[32
,37
]}

Dupre, R. ^{[21
]}

Ehrhart, M. ^{[21
]}

El Alaoui, A. ^{[40
]}

El Fassi, L. ^{[27
]}

Elouadrhiri, L. ^{[39
]}

Fegan, S. ^{[45
]}

Filippi, A. ^{[19
]}

Gavalian, G. ^{[39
]}

Glazier, D. I. ^{[44
]}

Golubenko, A. A. ^{[36
]}

Gosta, G. ^{[20
,42
]}

机构：

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

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

[3] Canisius Coll, Buffalo, NY 14208 USA

[4] Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France

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

[6] Univ Connecticut, Storrs, CT 06269 USA

[7] Duke Univ, Durham, NC 27708 USA

[8] Duquesne Univ, 600 Forbes Ave, Pittsburgh, PA 15282 USA

[9] Fairfield Univ, Fairfield, CT 06824 USA

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

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

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

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

[14] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

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

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

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

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

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

[20] INFN, Sez Pavia, I-27100 Pavia, Italy

[21] Univ Paris Saclay, CNRS, IN2P3, IJCLab, F-91405 Orsay, France

[22] Inst Kernphys Juelich, Julich, Germany

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

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

[25] Lamar Univ, 4400 MLK Blvd,POB 10046, Beaumont, TX 77710 USA

[26] MIT, Cambridge, MA 02139 USA

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

[28] Natl Res Ctr Kurchatov Inst TEP, Moscow 117259, Russia

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

[30] New Mexico State Univ, POB 30001, Las Cruces, NM 88003 USA

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

[32] Ohio Univ, Athens, OH 45701 USA

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

[34] Univ Giessen, Phys Inst 2, D-35392 Giessen, Germany

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

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

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

[38] Temple Univ, Philadelphia, PA 19122 USA

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

[40] Univ Tecn Federico Santa Maria, Casilla 110-V, Valparaiso, Chile

[41] Univ Insubria, I-22100 Como, Italy

[42] Univ Brescia, I-25123 Brescia, Italy

[43] Univ Calif Riverside, 900 Univ Ave, Riverside, CA 92521 USA

[44] Univ Glasgow, Glasgow G12 8QQ, Scotland

[45] Univ York, York YO10 5DD, England

[46] Univ Virginia, Charlottesville, VA 22901 USA

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

[48] Yerevan Phys Inst, Yerevan 375036, Armenia

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 131卷 / 02期

基金：

美国国家科学基金会; 英国科学技术设施理事会; 新加坡国家研究基金会;

关键词：

PION PRODUCTION; PHOTOPRODUCTION; MESONS; DELTA;

D O I：

10.1103/PhysRevLett.131.021901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The polarized cross-section ratio rrLT �/rr0 from hard exclusive ir-A++ electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. The study, which provides the first observation of this channel in the deep-inelastic regime, focuses on very forward-pion kinematics in the valence regime, and photon virtualities ranging from 1.5 GeV2 up to 7 GeV2. The reaction provides a novel access to the d-quark content of the nucleon and to p & RARR; A++ transition generalized parton distributions. A comparison to existing results for hard exclusive ir+n and ir0p electroproduction is provided, which shows a clear impact of the excitation mechanism, encoded in transition generalized parton distributions, on the asymmetry.

引用

页数：7

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