Measurements of the proton elastic-form-factor ratio μpGEp/GMp at low momentum transfer

被引：49
作者：
Ron, G.
Glister, J.
Lee, B.
Allada, K.
Armstrong, W.
Arrington, J.
Beck, A.
Benmokhtar, F.
Berman, B. L.
Boeglin, W.
Brash, E.
Camsonne, A.
Calarco, J.
Chen, J. P.
Choi, Seonho
Chudakov, E.
Coman, L.
Craver, B.
Cusanno, F.
Dumas, J.
Dutta, C.
Feuerbach, R.
Freyberger, A.
Frullani, S.
Garibaldi, F.
Gilman, R.
Hansen, O.
Higinbotham, D. W.
Holmstrom, T.
Hyde, C. E.
Ibrahim, H.
Ilieva, Y.
de Jager, C. W.
Jiang, X.
Jones, M. K.
Kang, H.
Kelleher, A.
Khrosinkova, E.
Kuchina, E.
Kumbartzki, G.
LeRose, J. J.
Lindgren, R.
Markowitz, P.
Beck, S. May-Tal
McCullough, E.
Meekins, D.
Meziane, M.
Meziani, Z. -E.
Michaels, R.
Moffit, B.
机构：
[1] St Marys Univ, Halifax, NS B3H 3C3, Canada
[2] Dalhousie Univ, Halifax, NS B3H 3J5, Canada
[3] Seoul Natl Univ, Seoul 151747, South Korea
[4] Univ Kentucky, Lexington, KY 40506 USA
[5] Temple Univ, Philadelphia, PA USA
[6] Argonne Natl Lab, Argonne, IL 60439 USA
[7] NRCN, IL-84190 Beer Sheva, Israel
[8] Univ Maryland, Baltimore, MD 21201 USA
[9] George Washington Univ, Washington, DC 20052 USA
[10] Florida Int Univ, Miami, FL 33199 USA
[11] Christopher Newport Univ, Newport News, VA 23606 USA
[12] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA
[13] Univ New Hampshire, Durham, NH 03824 USA
[14] Univ Virginia, Charlottesville, VA 22904 USA
[15] Ist Super Sanita, Fis Lab, Sez Sanita, INFN, I-00161 Rome, Italy
[16] Rutgers State Univ, Piscataway, NJ 08855 USA
[17] Coll William & Mary, Williamsburg, VA 23187 USA
[18] Old Dominion Univ, Norfolk, VA 23508 USA
[19] Univ Blaise Pascal, CNRS, IN2P3, F-63177 Aubiere, France
[20] Kent State Univ, Kent, OH 44242 USA
[21] St Norbert Coll, Green Bay, WI USA
[22] Univ S Carolina, Columbia, SC 29208 USA
[23] Jozef Stefan Inst, Ljubljana 1000, Slovenia
[24] Kharkov Inst, UA-310108 Kharkov, Ukraine
[25] MIT, Cambridge, MA 02139 USA
[26] Norfolk State Univ, Norfolk, VA 23504 USA
[27] Duke Univ, Dept Geol, Durham, NC 27708 USA
[28] Ohio Univ, Athens, OH 45701 USA
[29] Yerevan Phys Inst, Yerevan 375036, Armenia
[30] Univ Ljubljana, Dept Phys, Ljubljana 1000, Slovenia
[31] INFN, Sez Roma, I-00185 Rome, Italy
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 20期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.99.202002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
High-precision measurements of the proton elastic form-factor ratio, mu(p)G(E)(p)/G(M)(p), have been made at four-momentum transfer, Q(2), values between 0.2 and 0.5 GeV2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q(2) range the deviation from unity is primarily due to G(E)(p) being smaller than expected.
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