Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering

D. S. Armstrong et al. (G0 Collaboration)
Phys. Rev. Lett. 99, 092301 – Published 29 August 2007

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. An provides a direct probe of the imaginary component of the 2γ exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments.

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  • Received 11 May 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.092301

©2007 American Physical Society

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Vol. 99, Iss. 9 — 31 August 2007

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