APS » PROLA » Phys. Rev. Lett. » Volume 78 » Issue 20

Phys. Rev. Lett. 78, 3824 - 3827 (1997)

Measurement of the Proton's Neutral Weak Magnetic Form Factor
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B. Mueller1, D. H. Beck2, E. J. Beise3, E. Candell4, L. Cardman2, R. Carr1, R. C. DiBari4, G. Dodson5, K. Dow5, F. Duncan3, M. Farkhondeh5, B. W. Filippone1, T. Forest2, H. Gao2, W. Korsch1, S. Kowalski5, A. Lung3, R. D. McKeown1, R. Mohring3, J. Napolitano4, D. Nilsson2, M. Pitt1, N. Simicevic2, B. Terburg2, and S. P. Wells5 (SAMPLE Collaboration)
1Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125
2University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
3University of Maryland, College Park, Maryland 20742
4Rensselaer Polytechnic Institute, Troy, New York 12180
5Bates Linear Accelerator Center, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Received 24 February 1997

We report the first measurement of the parity-violating asymmetry in elastic electron scattering from the proton. The asymmetry depends on the neutral weak magnetic form factor of the proton which contains new information on the contribution of strange quark-antiquark pairs to the magnetic moment of the proton. We obtain the value GMZ  =  0.34±0.09±0.04±0.05 n.m. at Q2  =  0.1 (GeV/c)2.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v78/p3824
DOI: 10.1103/PhysRevLett.78.3824
PACS: 13.60.Fz, 11.30.Er, 13.40.Gp, 14.20.Dh

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