Parity-Violating Electron Scattering from ⁴He and the Strange Electric Form Factor of the Nucleon

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K. A. Aniol,¹ D. S. Armstrong,² T. Averett,² H. Benaoum,³ P. Y. Bertin,⁴ E. Burtin,⁵ J. Cahoon,⁶ G. D. Cates,⁷ C. C. Chang,⁸ Y.-C. Chao,⁹ J.-P. Chen,⁹ Seonho Choi,¹⁰ E. Chudakov,⁹ B. Craver,⁷ F. Cusanno,¹¹ P. Decowski,¹² D. Deepa,¹³ C. Ferdi,⁴ R. J. Feuerbach,⁹ J. M. Finn,² S. Frullani,¹¹ K. Fuoti,⁶ F. Garibaldi,¹¹ R. Gilman,^14,9 A. Glamazdin,¹⁵ V. Gorbenko,¹⁵ J. M. Grames,⁹ J. Hansknecht,⁹ D. W. Higinbotham,⁹ R. Holmes,³ T. Holmstrom,² T. B. Humensky,¹⁶ H. Ibrahim,¹³ C. W. de Jager,⁹ X. Jiang,¹⁴ L. J. Kaufman,⁶ A. Kelleher,² A. Kolarkar,¹⁷ S. Kowalski,¹⁸ K. S. Kumar,⁶ D. Lambert,¹² P. LaViolette,⁶ J. LeRose,⁹ D. Lhuillier,⁵ N. Liyanage,⁷ D. J. Margaziotis,¹ M. Mazouz,¹⁹ K. McCormick,¹⁴ D. G. Meekins,⁹ Z.-E. Meziani,¹⁰ R. Michaels,⁹ B. Moffit,² P. Monaghan,¹⁸ C. Munoz-Camacho,⁵ S. Nanda,⁹ V. Nelyubin,^7,20 D. Neyret,⁵ K. D. Paschke,⁶ M. Poelker,⁹ R. Pomatsalyuk,¹⁵ Y. Qiang,¹⁸ B. Reitz,⁹ J. Roche,⁹ A. Saha,⁹ J. Singh,⁷ R. Snyder,⁷ P. A. Souder,³ R. Subedi,²¹ R. Suleiman,¹⁸ V. Sulkosky,² W. A. Tobias,⁷ G. M. Urciuoli,¹¹ A. Vacheret,⁵ E. Voutier,¹⁹ K. Wang,⁷ R. Wilson,²² B. Wojtsekhowski,⁹ 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

Wehave measured the parity-violating electroweak asymmetry in the elastic scatteringof polarized electrons from ⁴He at an average scattering angle theta _lab=5.7° and a four-momentum transfer Q²=0.091 GeV². From these data, forthe first time, the strange electric form factor of thenucleon G <sub>E</sub><sup>s</sup> can be isolated. The measured asymmetry of A_PV=(6.72±0.84_(stat)±0.21_(syst))×10^-6yields a value of G=-0.038±0.042_(stat)±0.010_(syst), consistent with zero.

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 13.60.Fz Elastic and Compton scattering 11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries in particles and fields 14.20.Dh Protons and neutrons 25.30.Bf Nuclear elastic electron scattering YEAR: 2006
KEYWORDS:	polarisation in elementary particle interactions, electron-nucleus reactions, form factors (elementary particles), electrons, discrete symmetries, electroweak theories

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Phys. Rev. Lett. 96, 022003 (2006) [5 pages]

Parity-Violating Electron Scattering from 4He and the Strange Electric Form Factor of the Nucleon

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Parity-Violating Electron Scattering from ⁴He and the Strange Electric Form Factor of the Nucleon