Phys. Rev. C
71,
055202
(2005)
[27 pages]
Proton elastic form factor ratios to Q2=3.5 GeV2 by polarization transfer
V. Punjabi et al. Jefferson Lab Hall A Collaboration
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V. Punjabi1,*, C. F. Perdrisat2, K. A. Aniol7, F. T. Baker4, J. Berthot6, P. Y. Bertin6, W. Bertozzi22, A. Besson6, L. Bimbot26, W. U. Boeglin10, E. J. Brash5,30,†, D. Brown21, J. R. Calarco23, L. S. Cardman30, Z. Chai22, C.-C. Chang21, J.-P. Chen30, E. Chudakov30, S. Churchwell8, E. Cisbani14, D. S. Dale17, R. De Leo13, A. Deur6,30, B. Diederich25, J. J. Domingo30, M. B. Epstein7, L. A. Ewell21, K. G. Fissum22,‡, A. Fleck5, H. Fonvieille6, S. Frullani14, J. Gao22,§, F. Garibaldi14, A. Gasparian12,17,**, G. Gerstner2, S. Gilad22, R. Gilman3,30, A. Glamazdin18, C. Glashausser3, J. Gomez30, V. Gorbenko18, A. Green33, J.-O. Hansen30, C. R. Howell8, G. M. Huber5, M. Iodice14, C. W. de Jager30, S. Jaminion6, X. Jiang3, M. K. Jones2,30, W. Kahl28, J. J. Kelly21, M. Khayat16, L. H. Kramer10, G. Kumbartzki3, M. Kuss30, E. Lakuriki29, G. Laveissière6, J. J. LeRose30, M. Liang30, R. A. Lindgren32, N. Liyanage22,30,32, G. J. Lolos5, R. Macri8, R. Madey16,12, S. Malov3, D. J. Margaziotis7, P. Markowitz10, K. McCormick25,16,3, J. I. McIntyre3, R. L. J. van der Meer30,5, R. Michaels30, B. D. Milbrath9, J. Y. Mougey19, S. K. Nanda30, E. A. J. M. Offermann30,††, Z. Papandreou5, L. Pentchev2, G. G. Petratos16, N. M. Piskunov15, R. I. Pomatsalyuk18, D. L. Prout16, G. Quéméner2,19, R. D. Ransome3, B. A. Raue10, Y. Roblin6,30, R. Roche11,25, G. Rutledge2, P. M. Rutt30, A. Saha30, T. Saito31, A. J. Sarty11,‡‡, T. P. Smith23, P. Sorokin18, S. Strauch2,a, R. Suleiman16,22, K. Takahashi31, J. A. Templon4,b, L. Todor25,c, P. E. Ulmer25, G. M. Urciuoli14, P. Vernin27, B. Vlahovic24, H. Voskanyan34, K. Wijesooriya2, B. B. Wojtsekhowski30, R. J. Woo20, F. Xiong22, G. D. Zainea5, and Z.-L. Zhou22 (Jefferson Lab Hall A Collaboration)
1Norfolk State University, Norfolk, Virginia 23504, USA
2College of William and Mary, Williamsburg, Virginia 23187, USA
3Rutgers, State University of New Jersey, Piscataway, New Jersey 08855, USA
4University of Georgia, Athens, Georgia 30602, USA
5University of Regina, Regina, Saskatchiwan, Canada S4S OA2,
6Université Blaise Pascal/CNRS-IN2P3, F-63177 Aubière, France
7California State University, Los Angeles, Los Angeles, California 90032, USA
8Duke University and TUNL, Durham, North Carolina 27708, USA
9Eastern Kentucky University, Richmond, Kentucky 40475, USA
10Florida International University, Miami, Florida 33199, USA
11Florida State University, Tallahassee, Florida 32306, USA
12Hampton University, Hampton, Virginia 23668, USA
13INFN, Sezione di Bari and University of Bari, I-70126 Bari, Italy
14INFN, Sezione Sanitá and Istituto Superiore di Sanitá, I-00161 Rome, Italy
15JINR-LHE, 141980 Dubna, Russia
16Kent State University, Kent, Ohio 44242, USA
17University of Kentucky, Lexington, Kentucky 40506, USA
18Kharkov Institute of Physics and Technology, Kharkov 310108, Ukraine
19Laboratoire de Physique Subatomique et de Cosmologie, CNRS-IN2P3, F-38026 Grenoble, France
20University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
21University of Maryland, College Park, Maryland 20742, USA
22Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
23University of New Hampshire, Durham, New Hampshire 03824, USA
24North Carolina Central University, Durham, North Carolina 27707, USA
25Old Dominion University, Norfolk, Virginia 23508, USA
26Institut de Physique Nucléaire, F-91406 Orsay, France
27CEA Saclay, F-91191 Gif-sur-Yvette, France
28Syracuse University, Syracuse, New York 13244, USA
29Temple University, Philadelphia, Philadelphia 19122, USA
30Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
31Tohoku University, Sendai 980, Japan
32University of Virginia, Charlottesville, Virginia 22901, USA
33Western Cape University, Capetown, South Africa
34Yerevan Physics Institute, Yerevan 375036, Armenia
See Also:
Publisher's Note
Received 12 January 2005; published 20 May 2005; publisher error corrected 8 June 2005
The ratio of the proton elastic electromagnetic form factors, GEp/GMp, was obtained by measuring Pt and Pℓ, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic e⃗p→ep⃗reaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV2. In the single-photon exchange approximation, GEp/GMp is directly proportional to Pt/Pℓ. The simultaneous measurement of Pt and Pℓ in a polarimeter reduces systematic uncertainties. The results for GEp/GMp show a systematic decrease with increasing Q2, 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.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.71.055202
DOI:
10.1103/PhysRevC.71.055202
PACS:
25.30.Bf, 13.40.Gp, 24.85.+p
*Electronic address: punjabi@jlab.org †Present address: Christopher Newport University, Newport News, VA 23606, USA. ‡Present address: University of Lund, Box 118, SE-221 00 Lund, Sweden. §Present address: California Institute of Technology, Pasadena, CA 91125, USA. **Present address: North Carolina Ag. and Tech. State University, Greensboro, NC 27411, USA. ††Present address: Renaissance Technology Corp., Setauket, NY 11733, USA. ‡‡Present address: Saint Mary's University, Halifax, NS, Canada B3H 3C3. aPresent address: George Washington University, Washington, DC 20052, USA. bPresent address: NIKHEF, Amsterdam, The Netherlands. cPresent address: Carnegie Mellon University, Pittsburgh, PA 15217, USA.
See Also
Publisher's Note:
V. Punjabi et al.,
Publisher's Note: Proton elastic form factor ratios to Q2=3.5 GeV2 by polarization transfer [Phys. Rev. C 71, 055202 (2005)],
Phys. Rev. C 71, 069902 (2005).
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