High-precision measurement of the proton elastic form factor ratio μpGE/GM at low Q2

被引：163

作者：

Zhan, X. ^{[1
,2
]}

Allada, K. ^{[3
]}

Armstrong, D. S. ^{[4
]}

Arrington, J. ^{[1
]}

Bertozzi, W. ^{[2
]}

Boeglin, W. ^{[5
]}

Chen, J. -P. ^{[6
]}

Chirapatpimol, K. ^{[7
]}

Choi, S. ^{[8
]}

Chudakov, E. ^{[6
]}

Cisbani, E. ^{[9
,10
]}

Decowski, P. ^{[11
]}

Dutta, C. ^{[3
]}

Frullani, S. ^{[9
]}

Fuchey, E. ^{[12
]}

Garibaldi, F. ^{[9
]}

Gilad, S. ^{[2
]}

Gilman, R. ^{[6
,13
]}

Glister, J. ^{[14
,15
]}

Hafidi, K. ^{[1
]}

Hahn, B. ^{[4
]}

Hansen, J. -O. ^{[6
]}

Higinbotham, D. W. ^{[6
]}

Holmstrom, T. ^{[16
]}

Holt, R. J. ^{[1
]}

Huang, J. ^{[2
]}

Huber, G. M. ^{[17
]}

Itard, F. ^{[12
]}

de Jager, C. W. ^{[6
]}

Jiang, X. ^{[13
]}

Johnson, M. ^{[18
]}

Katich, J. ^{[4
]}

de Leo, R. ^{[19
,20
]}

LeRose, J. J. ^{[6
]}

Lindgren, R. ^{[7
]}

Long, E. ^{[21
]}

Margaziotis, D. J. ^{[22
]}

Beck, S. May-Tal ^{[23
]}

Meekins, D. ^{[6
]}

Michaels, R. ^{[6
]}

Moffit, B. ^{[2
,6
]}

Norum, B. E. ^{[7
]}

Olson, M. ^{[24
]}

Piasetzky, E. ^{[25
]}

Pomerantz, I. ^{[25
]}

Protopopescu, D. ^{[26
]}

Qian, X. ^{[27
]}

Qiang, Y. ^{[6
,27
]}

Rakhman, A. ^{[28
]}

Ransome, R. D. ^{[13
]}

机构：

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

[2] MIT, Cambridge, MA 02139 USA

[3] Univ Kentucky, Lexington, KY 40506 USA

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

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

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

[7] Univ Virginia, Charlottesville, VA 22904 USA

[8] Seoul Natl Univ, Seoul 151747, South Korea

[9] Ist Nazl Fis Nucl, Sez Roma, Grp Sanita, I-00161 Rome, Italy

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

[11] Smith Coll, Northampton, MA 01063 USA

[12] Univ Blaise Pascal, F-63177 Clermont Ferrand, France

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

[14] St Marys Univ, Halifax, NS B3H 3C3, Canada

[15] Dalhousie Univ, Halifax, NS B3H 3J5, Canada

[16] Longwood Univ, Farmville, VA 23909 USA

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

[18] Northwestern Univ, Evanston, IL 60208 USA

[19] Dipartimento Fis, Bari, Italy

[20] INFN Sez Bari, Bari, Italy

[21] Kent State Univ, Kent State, OH 44242 USA

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

[23] NRCN, IL-84190 Beer Sheva, Israel

[24] St Norbert Coll, De Pere, WI 54115 USA

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

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

[27] Duke Univ, Durham, NC 27708 USA

[28] Syracuse Univ, Syracuse, NY 13244 USA

[29] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[30] Temple Univ, Philadelphia, PA 19122 USA

[31] Yerevan Phys Inst, Yerevan 375036, Armenia

[32] Jozef Stefan Inst, Ljubljana 1000, Slovenia

[33] Univ Ljubljana, Dept Phys, Ljubljana 1000, Slovenia

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

[35] Univ Illinois, Urbana, IL 61801 USA

[36] Hampton Univ, Hampton, VA 23668 USA

[37] Lanzhou Univ, Lanzhou 730000, Peoples R China

来源：

PHYSICS LETTERS B | 2011年 / 705卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

POLARIZATION TRANSFER; NUCLEON;

D O I：

10.1016/j.physletb.2011.10.002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report a new, high-precision measurement of the proton elastic form factor ratio mu(p)G(E)/G(M) for the four-momentum transfer squared Q(2) = 0.3-0.7 (GeV/c)(2). The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With a total uncertainty of approximately 1%, the new data clearly show that the deviation of the ratio mu(p)G(E)/G(M) from unity observed in previous polarization measurements at high Q(2) continues down to the lowest Q(2) value of this measurement. The updated global fit that includes the new results yields an electric (magnetic) form factor roughly 2% smaller (1% larger) than the previous global fit in this Q(2) range. We obtain new extractions of the proton electric and magnetic radii, which are < r(E)(2)>(1/2) = 0.875 +/- 0.010 fm and < r(M)(2)>(1/2) = 0.867 +/- 0.020 fm. The charge radius is consistent with other recent extractions based on the electron-proton interaction, including the atomic hydrogen Lamb shift measurements, which suggests a missing correction in the comparison of measurements of the proton charge radius using electron probes and the recent extraction from the muonic hydrogen Lamb shift. (C) 2011 Published by Elsevier B.V.

引用

页码：59 / 64

页数：6

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