Two-Photon Exchange and Electromagnetic Proton Form Factors

Abstract

The presence of $2\gamma$-exchange in electron proton elastic scattering is discussed. From C-invariance and crossing symmetry, $2\gamma$ contribution induces a specific dependence of the reduced cross section on the variable $ϵ$. No evidence of such dependence exists in the available experimental data.

Comments: 4 pages, Contributed papers to Baryon 04