Two-photon exchange corrections to ${\gamma }^{\ast }N\Delta$ form factors for $Q^2\le 4$ (Gev/$c$)${}^2$

Hai-Qing Zhou, Shin Nan Yang

We evaluate the corrections of the two-photon exchange (TPE) process on the ${\gamma }^{\ast }N\Delta$ transition form factors. The contributions of the TPE process to the $eN\rightarrow eΔ(1232)\ri…