The European Physical Journal A

, Volume 32, Issue 4, pp 501–503 | Cite as

Transverse beam asymmetries measured from 4He and hydrogen targets

  • L. J. KaufmanEmail author
PAVI 2006


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.


25.30.Bf Elastic electron scattering 13.40.Gp Electromagnetic form factors 29.27.Hj Polarized beams 


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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of MassachusettsAmherstUSA

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