Two-photon exchange amplitude with π N intermediate states: Spin-1/2 and spin-3/2 channels

@article{Borisyuk2015TwophotonEA,
  title={Two-photon exchange amplitude with $\pi$ N intermediate states: Spin-1/2 and spin-3/2 channels},
  author={Dmitry Borisyuk and Alexander P. Kobushkin},
  journal={Physical Review C},
  year={2015},
  volume={92},
  pages={035204}
}
We calculate two-photon exchange (TPE) amplitudes for the elastic electron-proton scattering, and take into account intermediate hadronic states containing \pi N system with total angular momentum 1/2 or 3/2, which includes 8 different channels. This is the improvement of our previous calculation, where only the \pi N states with quantum numbers of \Delta(1232) resonance were included. The results show good consistency with recent experimental data. At high Q^2, newly-calculated contributions… 

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