Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasi-elastic Electron-Deuteron Scattering
Mar, 20116 pages
Published in:
- Phys.Rev.Lett. 107 (2011) 022501
e-Print:
- 1103.3667 [nucl-ex]
Report number:
- JLAB-PHY-11-1334
Citations per year
Abstract: (arXiv)
We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasi-elastic scattering on the deuteron, at backward angles (lab scattering angle of 108 degrees) for Q2 = 0.22 GeV^2/c^2 and 0.63 GeV^2/c^2 at beam energies of 362 MeV and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (piN) states. An estimate of the beam-normal single-spin asymmetry for the scattering from the neutron is made using a quasi-static deuterium approximation, and is also in agreement with theory.- 25.30.Bf
- 24.70.+s
- 14.20.Dh
- 13.40.-f
References(17)
Figures(3)