Transverse beam asymmetries measured from 4He and hydrogen targets
Department of Physics, University of Massachusetts, 01003, Amherst, MA, USA
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Accepted: 18 March 2007
Published online: 3 July 2007
The HAPPEX Collaboration at Jefferson Lab has measured the transverse beam spin asymmetries (AT) for elastic electron scattering from proton and 4He targets. The experiment was conducted using a vertically polarized electron beam of energy ∼ 3 GeV, at a Q 2 ∼ 0.1 GeV^2 and a scattering angle θlab ∼ 6° . The preliminary results are reported here. The 4He measurement is the first measurement of AT from a nucleus. AT for 4He is non-negligible; therefore, it will be necessary to make measurements of AT for future parity-violating experiments using nuclear targets.
PACS: 25.30.Bf Elastic electron scattering – / 13.40.Gp Electromagnetic form factors – / 29.27.Hj Polarized beams –
© Società Italiana di Fisica and Springer-Verlag, 2007