Proton elastic form factor ratios to Q2=3.5 GeV2 by polarization transfer -: art. no. 055202

被引:384
作者
Punjabi, V [1 ]
Perdrisat, CF
Aniol, KA
Baker, FT
Berthot, J
Bertin, PY
Bertozzi, W
Besson, A
Bimbot, L
Boeglin, WU
Brash, EJ
Brown, D
Calarco, JR
Cardman, LS
Chai, Z
Chang, CC
Chen, JP
Chudakov, E
Churchwell, S
Cisbani, E
Dale, DS
Leo, RD
Deur, A
Diederich, B
Domingo, JJ
Epstein, MB
Ewell, LA
Fissum, KG
Fleck, A
Fonvieille, H
Frullani, S
Gao, J
Garibaldi, F
Gasparian, A
Gerstner, G
Gilad, S
Gilman, R
Glamazdin, A
Glashausser, C
Gomez, J
Gorbenko, V
Green, A
Hansen, JO
Howell, CR
Huber, GM
Iodice, M
de Jager, CW
Jaminion, S
Jiang, X
Jones, MK
机构
[1] Norfolk State Univ, Norfolk, VA 23504 USA
[2] Coll William & Mary, Williamsburg, VA 23187 USA
[3] Rutgers State Univ, Piscataway, NJ 08855 USA
[4] Univ Georgia, Athens, GA 30602 USA
[5] Univ Regina, Regina, SK S4S 0A2, Canada
[6] Univ Clermont Ferrand, CNRS, IN2P3, F-63117 Aubiere, France
[7] Calif State Univ Los Angeles, Los Angeles, CA 90032 USA
[8] Duke Univ, Durham, NC 27708 USA
[9] TUNL, Durham, NC 27708 USA
[10] Eastern Kentucky Univ, Richmond, KY 40475 USA
[11] Florida Int Univ, Miami, FL 33199 USA
[12] Florida State Univ, Tallahassee, FL 32306 USA
[13] Hampton Univ, Hampton, VA 23668 USA
[14] Univ Bari, I-70126 Bari, Italy
[15] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy
[16] Ist Super Sanita, I-00161 Rome, Italy
[17] Joint Inst Nucl Res, LHE, Dubna 141980, Russia
[18] Kent State Univ, Kent, OH 44242 USA
[19] Univ Kentucky, Lexington, KY 40506 USA
[20] Kharkov Phys & Technol Inst, UA-310108 Kharkov, Ukraine
[21] CNRS, Lab Phys Subatom & Cosmol, IN2P3, F-38026 St Martin Dheres, France
[22] Univ Manitoba, Winnipeg, MB R3T 2N2, Canada
[23] Univ Maryland, College Pk, MD 20742 USA
[24] MIT, Cambridge, MA 02139 USA
[25] Univ New Hampshire, Durham, NH 03824 USA
[26] N Carolina Cent Univ, Durham, NC 27707 USA
[27] Old Dominion Univ, Norfolk, VA 23508 USA
[28] Inst Phys Nucl, F-91406 Orsay, France
[29] CEA Saclay, F-91191 Gif Sur Yvette, France
[30] Syracuse Univ, Syracuse, NY 13244 USA
[31] Temple Univ, Philadelphia, PA 19122 USA
[32] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA
[33] Tohoku Univ, Sendai, Miyagi 980, Japan
[34] Univ Virginia, Charlottesville, VA 22901 USA
[35] Univ Western Cape, Cape Town, South Africa
[36] Yerevan Phys Inst, Yerevan 375036, Armenia
来源
PHYSICAL REVIEW C | 2005年 / 71卷 / 05期
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevC.71.055202
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The ratio of the proton elastic electromagnetic form factors, G(Ep)/G(Mp), was obtained by measuring P-t and P-l, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic e(->)p -> ep(->)reaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV2. In the single-photon exchange approximation, G(Ep)/G(Mp) is directly proportional to P-t/P-l. The simultaneous measurement of P-t and P-l in a polarimeter reduces systematic uncertainties. The results for G(Ep)/G(Mp) show a systematic decrease with increasing Q(2), indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been reanalyzed and their systematic uncertainties have become significantly smaller than those reported previously.
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页数:27
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