# 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…

## 14 Citations

### Two-Photon Exchange Correction in Elastic Lepton–Proton Scattering

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We present the dispersion relation approach based on unitarity and analyticity to evaluate the two-photon exchange contribution to elastic electron–proton scattering. The leading elastic and first…

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We evaluate the two-photon exchange correction to the unpolarized cross section in the elastic muon–proton scattering within dispersion relations. One of the six independent invariant amplitudes…

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Three recent experiments have used the ratio of e+ p to e− p elastic scattering to directly determine the two-photon exchange (TPE) contribution to the elastic-scattering process. These experiments…

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### Contribution of Δ(1232) to real photon radiative corrections for elastic electron–proton scattering

- Physics
- 2016

Here we consider the contribution of the Δ(1232) resonance to the real photon radiative corrections for elastic ep-scattering. The effect is found to be small for past experiments studying the…

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In this work, we present a prediction of the positron-proton and electron-proton elastic scattering cross-section ratio ${R}_{{e}^{+}{e}^{\ensuremath{-}}}$ based on a new phenomenological…

### Two-Photon Exchange in Elastic Electron Scattering on Hadronic Systems

- Physics
- 2021

In the present review, we discuss different aspects of the two-photon exchange (TPE) physics in elastic ep scattering at high Q, as well as at low Q. The imaginary part of the TPE amplitude gives…

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