Measurement of Exclusive π0 Electroproduction Structure Functions and their Relationship to Transverse Generalized Parton Distributions

被引：54

作者：

Bedlinskiy, I. ^{[1
]}

Kubarovsky, V. ^{[29
,34
]}

Niccolai, S. ^{[21
]}

Stoler, P. ^{[29
]}

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

Aghasyan, M. ^{[18
]}

Amaryan, M. J. ^{[28
]}

Anghinolfi, M. ^{[19
]}

Avakian, H. ^{[34
]}

Baghdasaryan, H. ^{[38
,40
]}

Ball, J. ^{[7
]}

Baltzell, N. A. ^{[41
]}

Battaglieri, M. ^{[19
]}

Bennett, R. P. ^{[28
]}

Biselli, A. S. ^{[11
,29
]}

Bookwalter, C. ^{[13
]}

Boiarinov, S. ^{[34
]}

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

Brooks, W. K. ^{[34
,36
]}

Burkert, V. D. ^{[34
]}

Carman, D. S. ^{[34
]}

Celentano, A. ^{[19
]}

Chandavar, S. ^{[27
]}

Charles, G. ^{[7
]}

Contalbrigo, M. ^{[17
]}

Crede, V. ^{[13
]}

D'Angelo, A. ^{[20
,31
]}

Daniel, A. ^{[27
]}

Dashyan, N. ^{[40
]}

De Vita, R. ^{[19
]}

De Sanctis, E. ^{[18
]}

Deur, A. ^{[34
]}

Djalali, C. ^{[33
]}

Doughty, D. ^{[8
,34
]}

Dupre, R. ^{[7
]}

Egiyan, H. ^{[34
,39
]}

El Alaoui, A. ^{[41
]}

El Fassi, L. ^{[41
]}

Elouadrhiri, L. ^{[34
]}

Eugenio, P. ^{[13
]}

Fedotov, G. ^{[33
]}

Fegan, S. ^{[37
]}

Fleming, J. A. ^{[10
]}

Forest, T. A. ^{[16
]}

Fradi, A. ^{[21
]}

Garcon, M. ^{[7
]}

Gevorgyan, N. ^{[40
]}

Giovanetti, K. L. ^{[22
]}

Girod, F. X. ^{[34
]}

Gohn, W. ^{[9
]}

机构：

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

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

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

[9] Univ Connecticut, Storrs, CT 06269 USA

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

[11] Fairfield Univ, Fairfield, CT 06824 USA

[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] Inst Phys Nucl ORSAY, Orsay, France

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

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

[24] Univ Grenoble 1, CNRS, LPSC, INPG,IN2P3, Grenoble, France

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

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

[27] Ohio Univ, Athens, OH 45701 USA

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

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

[30] Univ Richmond, Richmond, VA 23173 USA

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

[32] Skobeltsyn Nucl Phys Inst, Moscow 119899, Russia

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

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

[35] Union Coll, Schenectady, NY 12308 USA

[36] Univ Tecn Federico Santa Maria, Valparaiso, Chile

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

[38] Univ Virginia, Charlottesville, VA 22901 USA

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

[40] Yerevan Phys Inst, Yerevan 375036, Armenia

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

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 11期

基金：

英国科学技术设施理事会; 新加坡国家研究基金会; 美国国家科学基金会;

关键词：

PION ELECTROPRODUCTION;

D O I：

10.1103/PhysRevLett.109.112001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Exclusive pi(0) electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1800 kinematic values in Q(2), x(B), t, and phi(pi), in the Q(2) range from 1.0 to 4.6 GeV2, -t up to 2 GeV2, and x(B) from 0.1 to 0.58. Structure functions sigma(T) + epsilon sigma(L), sigma(TT), and sigma(LT) were extracted as functions of t for each of 17 combinations of Q(2) and x(B). The data were compared directly with two handbag-based calculations including both longitudinal and transversity generalized parton distributions (GPDs). Inclusion of only longitudinal GPDs very strongly underestimates sigma(T) + epsilon sigma(L) and fails to account for sigma(TT) and sigma(LT), while inclusion of transversity GPDs brings the calculations into substantially better agreement with the data. There is very strong sensitivity to the relative contributions of nucleon helicity-flip and helicity nonflip processes. The results confirm that exclusive pi(0) electroproduction offers direct experimental access to the transversity GPDs.

引用

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