Parity-violating electron scattering from 4He and the strange electric form factor of the nucleon.

Phys Rev Lett

California State University, Los Angeles, Los Angeles, California 90032, USA.

Published: January 2006

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from 4He at an average scattering angle = 5.7 degrees and a four-momentum transfer Q2 = 0.091 GeV2 . From these data, for the first time, the strange electric form factor of the nucleon G(E)s can be isolated. The measured asymmetry of A(PV) = (6.72 +/- 0.84(stat) +/- 0.21(syst) x 10(-6) yields a value of G(E)s = -0.038 +/- 0.042(stat) +/- 0.010(syst), consistent with zero.

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http://dx.doi.org/10.1103/PhysRevLett.96.022003	DOI Listing

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