HAPPEX parity violation experiments: status and plans
D.S. Armstrong
College of William & Mary
The HAPPEX program at Jefferson Lab of parity-violation in elastic
electron scattering will be presented. The results and implications of
the recently completed HAPPEX I measurement on the proton at Q2 =
0.48 will be briefly reviewed. The status and plans will be presented
for the upcoming HAPPEX II measurement on the proton at Q2 = 0.10,
as well as the upcoming measurement with a 4He target at the same
momentum transfer. These two measurements will be primarily sensitive
to the strangeness radius parameter, however the combination of the
two experiments will also provide information on the strange
contribution to the proton's magnetic moment.