Speaker
Andrei Afanasev
(GWU)
Description
I will present an overview of the higher-order QED effects in lepton scattering on nucleons and nuclei. Availability of the positron beams provides a unique opportunity for direct measurements of C-odd asymmetries, when compared to their counterparts in electron scattering.
The studies of TMD’s in semi-inclusive lepton scattering show that T-odd spin asymmetries are typically a few per cent in magnitude. Recent DIS measurement at JLAB showed that T-odd asymmetries due to two-photon exchange are comparable; their separation would require lepton charge asymmetries. On the other hand, precision studies of GPD’s through an analysis of DVCS require knowledge of two-photon corrections both for DVCS and neutral-pion production.
Finally, I comment on the possibilities to study CP-violating effects with the positron beams.
Primary author
Andrei Afanasev
(GWU)
