Phys. Rev. Lett.
96,
022003
(2006)
[5 pages]
Parity-Violating Electron Scattering from 4He and the Strange Electric Form Factor of the Nucleon
K. A. Aniol et al. HAPPEX Collaboration
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K. A. Aniol1, D. S. Armstrong2, T. Averett2, H. Benaoum3, P. Y. Bertin4, E. Burtin5, J. Cahoon6, G. D. Cates7, C. C. Chang8, Y.-C. Chao9, J.-P. Chen9, Seonho Choi10, E. Chudakov9, B. Craver7, F. Cusanno11, P. Decowski12, D. Deepa13, C. Ferdi4, R. J. Feuerbach9, J. M. Finn2, S. Frullani11, K. Fuoti6, F. Garibaldi11, R. Gilman14,9, A. Glamazdin15, V. Gorbenko15, J. M. Grames9, J. Hansknecht9, D. W. Higinbotham9, R. Holmes3, T. Holmstrom2, T. B. Humensky16, H. Ibrahim13, C. W. de Jager9, X. Jiang14, L. J. Kaufman6, A. Kelleher2, A. Kolarkar17, S. Kowalski18, K. S. Kumar6, D. Lambert12, P. LaViolette6, J. LeRose9, D. Lhuillier5, N. Liyanage7, D. J. Margaziotis1, M. Mazouz19, K. McCormick14, D. G. Meekins9, Z.-E. Meziani10, R. Michaels9, B. Moffit2, P. Monaghan18, C. Munoz-Camacho5, S. Nanda9, V. Nelyubin7,20, D. Neyret5, K. D. Paschke6, M. Poelker9, R. Pomatsalyuk15, Y. Qiang18, B. Reitz9, J. Roche9, A. Saha9, J. Singh7, R. Snyder7, P. A. Souder3, R. Subedi21, R. Suleiman18, V. Sulkosky2, W. A. Tobias7, G. M. Urciuoli11, A. Vacheret5, E. Voutier19, K. Wang7, R. Wilson22, B. Wojtsekhowski9, and X. Zheng23 (HAPPEX Collaboration)
1California State University, Los Angeles, Los Angeles, California 90032, USA
2College of William and Mary, Williamsburg, Virginia 23187, USA
3Syracuse University, Syracuse, New York 13244, USA
4Université Blaise Pascal/CNRS-IN2P3, F-63177 Aubière, France
5CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette, France
6University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
7University of Virginia, Charlottesville, Virginia 22904, USA
8University of Maryland, College Park, Maryland 20742, USA
9Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
10Temple University, Philadelphia, Pennsylvania 19122, USA
11INFN, Sezione Sanità, 00161 Roma, Italy
12Smith College, Northampton, Massachusetts 01063, USA
13Old Dominion University, Norfolk, Virginia 23508, USA
14Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
15Kharkov Institute of Physics and Technology, Kharkov 310108, Ukraine
16University of Chicago, Chicago, Illinois 60637, USA
17University of Kentucky, Lexington, Kentucky 40506, USA
18Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
19Laboratoire de Physique Subatomique et de Cosmologie, 38026 Grenoble, France
20St. Petersburg Nuclear Physics Institute of Russian Academy of Science, Gatchina, 188350, Russia
21Kent State University, Kent, Ohio 44242, USA
22Harvard University, Cambridge, Massachusetts 02138, USA
23Argonne National Laboratory, Argonne, Illinois, 60439, USA
Received 8 June 2005; published 18 January 2006
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from 4He at an average scattering angle ⟨θlab⟩=5.7° and a four-momentum transfer Q2=0.091 GeV2. From these data, for the first time, the strange electric form factor of the nucleon GEs can be isolated. The measured asymmetry of APV=(6.72±0.84(stat)±0.21(syst))×10-6 yields a value of GEs=-0.038±0.042(stat)±0.010(syst), consistent with zero.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.022003
DOI:
10.1103/PhysRevLett.96.022003
PACS:
13.60.Fz, 11.30.Er, 14.20.Dh, 25.30.Bf
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