Search for Effects Beyond the Born Approximation in Polarization Transfer Observables in (e)over-right-arrow p Elastic Scattering

被引：87

作者：

Meziane, M. ^{[1
]}

Brash, E. J. ^{[2
,3
]}

Gilman, R. ^{[3
,4
]}

Jones, M. K. ^{[3
]}

Luo, W. ^{[5
]}

Pentchev, L. ^{[1
]}

Perdrisat, C. F. ^{[1
]}

Puckett, A. J. R. ^{[6
,7
]}

Punjabi, V. ^{[8
]}

Wesselmann, F. R. ^{[8
]}

Ahmidouch, A. ^{[9
]}

Albayrak, I. ^{[10
]}

Aniol, K. A. ^{[11
]}

Arrington, J. ^{[12
]}

Asaturyan, A. ^{[13
]}

Ates, O. ^{[10
]}

Baghdasaryan, H. ^{[14
]}

Benmokhtar, F. ^{[15
]}

Bertozzi, W. ^{[6
]}

Bimbot, L. ^{[16
,17
]}

Bosted, P. ^{[3
]}

Boeglin, W. ^{[18
]}

Butuceanu, C. ^{[19
]}

Carter, P. ^{[2
]}

Chernenko, S. ^{[20
]}

Christy, E. ^{[10
]}

Commisso, M. ^{[14
]}

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

Covrig, S. ^{[3
]}

Danagoulian, S. ^{[9
]}

Daniel, A. ^{[21
]}

Davidenko, A. ^{[22
]}

Day, D. ^{[14
]}

Dhamija, S. ^{[18
]}

Dutta, D. ^{[23
]}

Ent, R. ^{[3
]}

Frullani, S. ^{[24
,25
]}

Fenker, H. ^{[3
]}

Frlez, E. ^{[14
]}

Garibaldi, F. ^{[24
,25
]}

Gaskell, D. ^{[3
]}

Gilad, S. ^{[6
]}

Goncharenko, Y. ^{[22
]}

Hafidi, K. ^{[12
]}

Hamilton, D. ^{[26
]}

Higinbotham, D. W. ^{[3
]}

Hinton, W. ^{[8
]}

Horn, T. ^{[3
]}

Hu, B. ^{[5
]}

Huang, J. ^{[6
]}

机构：

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

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

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

[4] Rutgers State Univ, Piscataway, NJ 08855 USA

[5] Lanzhou Univ, Lanzhou 730000, Gansu, Peoples R China

[6] MIT, Cambridge, MA 02139 USA

[7] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

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

[9] N Carolina Agr & Tech State Univ, Greensboro, NC 27411 USA

[10] Hampton Univ, Hampton, VA 23668 USA

[11] Calif State Univ Los Angeles, Los Angeles, CA 90032 USA

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

[13] Yerevan Phys Inst, Yerevan 375036, Armenia

[14] Univ Virginia, Charlottesville, VA 22904 USA

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

[16] CNRS, Inst Phys Nucl, IN2P3, F-91405 Orsay, France

[17] Univ Paris 11, Orsay, France

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

[19] Univ Regina, Regina, SK S4S 0A2, Canada

[20] JINR LHE, Dubna 141980, Moscow Region, Russia

[21] Ohio Univ, Athens, OH 45701 USA

[22] IHEP, Protvino 142284, Moscow Region, Russia

[23] Mississippi State Univ, Starkville, MS 39762 USA

[24] Ist Nazl Fis Nucl, Sez Sanita, I-00161 Rome, Italy

[25] Ist Super Sanita, I-00161 Rome, Italy

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

[27] Seoul Natl Univ, Seoul 151742, South Korea

[28] Univ Witwatersrand, Johannesburg, South Africa

[29] Univ Maryland, College Pk, MD 20742 USA

[30] Univ Chem Technol & Met, BU-1756 Sofia, Bulgaria

[31] Tel Aviv Univ, IL-69978 Tel Aviv, Israel

[32] Jozef Stefan Inst, SI-1001 Ljubljana, Slovenia

[33] CEA Saclay, F-91191 Gif Sur Yvette, France

[34] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 13期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

FORM-FACTOR MEASUREMENTS; PROTON;

D O I：

10.1103/PhysRevLett.106.132501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, G(E)/G(M), obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic H((e) over right arrow, e' (p) over right arrow) reaction for three different beam energies at a Q(2) = 2: 5 GeV2, spanning a wide range of the kinematic parameter epsilon. The ratio R, which equals mu(p)G(E)/G(M) in the Born approximation, is found to be independent of epsilon at the 1.5% level. The epsilon dependence of the longitudinal polarization transfer component P-l shows an enhancement of (2.3 +/- 0.6)% relative to the Born approximation at large epsilon

引用

页数：6

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