Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.u3002i&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Previously the SAMPLE collaboration measured the parity-violating asymmetry in elastic electron scattering on hydrogen and quasielastic electron scattering on deuterium at backward angles at 200 MeV at the MIT-Bates laboratory. Combining the results of these measurements allows us to separately determine the nucleon's strange magnetic form factor and the nucleon's neutral weak axial form factor. The neutral weak axial form factor as measured in electron scattering includes anapole contributions and a class of electroweak radiative corrections that are absent in neutrino scattering. The combined results from the previous two SAMPLE experiments yielded a measurement of the axial form factor substantially different from the theoretical estimate. In order to confirm this observation with a measurement that has an improved signal-to-background ratio, a new measurement of the parity-violating asymmetry in quasielastic electron scattering on deuterium at 125 MeV has been carried out. In this talk, an overview of the experiment will be presented, along with results from the new measurement.
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