Phys. Rev. Lett.
88,
092301
(2002)
[5 pages]
Measurement of GEp/GMp in e⃗p→ep⃗ to Q2 = 5.6GeV2
O. Gayou et al. (Jefferson Lab Hall A Collaboration)
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O. Gayou1,7, K. A. Aniol9, T. Averett1, F. Benmokhtar2, W. Bertozzi24, L. Bimbot26, E. J. Brash4, J. R. Calarco25, C. Cavata27, Z. Chai24, C.-C. Chang23, T. Chang15, J.-P. Chen5, E. Chudakov5, R. De Leo16, S. Dieterich2, R. Endres2, M. B. Epstein9, S. Escoffier27, K. G. Fissum22, H. Fonvieille7, S. Frullani18, J. Gao8, F. Garibaldi18, S. Gilad24, R. Gilman2,5, A. Glamazdin21, C. Glashausser2, J. Gomez5, V. Gorbenko21, J.-O. Hansen5, D. W. Higinbotham24,*, G. M. Huber4, M. Iodice17, C. W. de Jager5, X. Jiang2, M. K. Jones5, J. J. Kelly23, M. Khandaker3, A. Kozlov4, K. M. Kramer1, G. Kumbartzki2, J. J. LeRose5, D. Lhuillier27, R. A. Lindgren26, N. Liyanage5, G. J. Lolos4, D. J. Margaziotis9, F. Marie27, P. Markowitz12, K. McCormick20, R. Michaels5, B. D. Milbrath11, S. K. Nanda5, D. Neyret27, Z. Papandreou4, L. Pentchev1,†, C. F. Perdrisat1, N. M. Piskunov19, V. Punjabi3, T. Pussieux27, G. Quéméner14, R. D. Ransome2, B. A. Raue12, R. Roché13, M. Rvachev24, A. Saha5, C. Salgado3, S. Širca24, I. Sitnik19, S. Strauch2,‡, L. Todor10, E. Tomasi-Gustafsson27, G. M. Urciuoli18, H. Voskanyan29, K. Wijesooriya6, B. B. Wojtsekhowski5, X. Zheng24, and L. Zhu24 (Jefferson Lab Hall A Collaboration)
1College of William and Mary, Williamsburg, Virginia 23187
2Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855
3Norfolk State University, Norfolk, Virginia 23504
4University of Regina, Regina, Saskatchewan, Canada S4S 0A2
5Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606
6Argonne National Laboratory, Argonne, Illinois 60439
7Université Blaise Pascal/CNRS-IN2P3, F-63177 Aubière, France
8California Institute of Technology, Pasadena, California 91125
9California State University, Los Angeles, California 90032
10Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
11Eastern Kentucky University, Richmond, Kentucky 40475
12Florida International University, Miami, Florida 33199
13Florida State University, Tallahassee, Florida 32306
14Institut des Sciences Nucléaires, CNRS-IN2P3, F-38026 Grenoble, France
15University of Illinois, Urbana-Champaign, Illinois 61801
16INFN, Sezione di Bari and University of Bari, 70126 Bari, Italy
17INFN, Sezione di Roma-III, 00146 Roma, Italy
18INFN, Sezione Sanità and Istituto Superiore di Sanità, 00161 Rome, Italy
19JINR-LHE, 141980 Dubna, Moscow Region, Russian Federation
20Kent State University, Kent, Ohio 44242
21Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine
22University of Lund, P.O. Box 118, S-221 00 Lund, Sweden
23University of Maryland, College Park, Maryland 20742
24Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
25University of New Hampshire, Durham, New Hampshire 03824
26Institut de Physique Nucléaire, F-91406 Orsay, France
27DAPNIA/SPhN CEA/Saclay, F-91191 Gif-sur-Yvette, France
28University of Virginia, Charlottesville, Virginia 22901
29Yerevan Physics Institute, Yerevan 375036, Armenia
Received 15 November 2001; published 12 February 2002
The ratio of the electric and magnetic form factors of the proton GEp/GMp, which is an image of its charge and magnetization distributions, was measured at the Thomas Jefferson National Accelerator Facility (JLab) using the recoil polarization technique. The ratio of the form factors is directly proportional to the ratio of the transverse to longitudinal components of the polarization of the recoil proton in the elastic e⃗p→ep⃗ reaction. The new data presented span the range 3.5<Q2<5.6GeV2 and are well described by a linear Q2 fit. Also, the ratio √Q2F2p/F1p reaches a constant value above Q2 = 2GeV2.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.092301
DOI:
10.1103/PhysRevLett.88.092301
PACS:
25.30.Bf, 13.40.Gp, 14.20.Dh, 24.85.+p
*Currently at Thomas Jefferson National Accelerator Facility, Newport News, VA 23606. †On leave of absence from Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria. ‡Currently at George Washington University, Washington, D.C. 20052.
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