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Updated: Jul 1, 2026

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
Transverse beam spin asymmetries in forward-angle elastic electron-proton scattering
D S Armstrong1, J Arvieux, R Asaturyan
1Department of Physics, College of William and Mary, Williamsburg, Virginia 23187, USA.
Abstract:
We have measured the beam-normal single-spin asymmetry in elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q2=0.15, 0.25 (GeV/c)2. The results are inconsistent with calculations solely using the elastic nucleon intermediate state and generally agree with calculations with significant inelastic hadronic intermediate state contributions. A(n) provides a direct probe of the imaginary component of the 2gamma exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.
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