Two photon exchange amplitude with \pi N intermediate states: spin-1/2 and spin-3/2 channels
| Autor: | Borisyuk, Dmitry, Kobushkin, Alexander |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. C 92, 035204 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.92.035204 |
| Popis: | 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 affect the correction to the measured proton form factor ratio \mu G_E/G_M. The total correction becomes somewhat smaller compared to our previous work, but is still significant and grows approximately linearly with Q^2. Comparing contributions of different channels, we found that larger contributions come from the channels with quantum numbers of lightest resonances. Comment: 6 pages, 6 figures |
| Databáze: | arXiv |
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