Two photon exchange for exclusive pion electroproduction.

Authors :: Afanasev, Andrei
Aleksejevs, Aleksandrs
Barkanova, Svetlana
Source :: Physical Review D: Particles, Fields, Gravitation & Cosmology. Sep2013, Vol. 88 Issue 5-A, p1-15. 15p.
Publication Year :: 2013
Abstract: We perform detailed calculations of two-photon-exchange QED corrections to the cross section of pion electroproduction. The results are obtained with and without the soft-photon approximation; analytic expressions for the radiative corrections are derived. The relative importance of the two-photon correction is analyzed for the kinematics of several experiments at Jefferson Lab. A significant, over 20%, effect due to two-photon exchange is predicted for the backward angles of electron scattering at large transferred momenta. [ABSTRACT FROM AUTHOR]