A new measurement at 570 MeV finds A_n = (-9.1 ± 2.1 ± 0.7) ppm for elastic electron scattering off 208Pb, a nonzero value that conflicts with the vanishing asymmetry seen at higher energy and points to unexplained kinematic dependence in two-photon exchange.
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Beam-Normal Single-Spin Asymmetry in $^{208}$Pb at low energy: discrepancy resolved or new kinematic puzzle?
A new measurement at 570 MeV finds A_n = (-9.1 ± 2.1 ± 0.7) ppm for elastic electron scattering off 208Pb, a nonzero value that conflicts with the vanishing asymmetry seen at higher energy and points to unexplained kinematic dependence in two-photon exchange.