Two photon exchange amplitude with πN intermediate states: P33 channel

Abstract

We consider two-photon exchange (TPE) in the elastic electron-proton scattering and evaluate the effect of πN (pion + nucleon) intermediate hadronic states. Among different πN states, we concentrate on the P33 channel; thus we effectively include Delta(1232) resonance with realistic width and shape and corresponding background as well. In agreement with the previous result, obtained for the zero-width resonance, we observe that the TPE correction to the electric form factor is the largest one; it grows with Q^2 and at Q^2 > 2.5 GeV^2 exceeds the corresponding elastic contribution.

9 pages, 5 figures. Sec.II revised, Appendix added, numerical results and conclusions unchanged

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