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Two-Photon Exchange: Myth and History

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Abstract

After recalling the arguments for possible excess of two-photon contribution over \(\alpha \)-counting, model independent statements about the consequences on the observables will be given. The relevant experimental data are discussed: (polarized and unpolarized) electron and positron elastic scattering on the proton, as well as annihilation data. A reanalysis of unpolarized electron–proton elastic scattering data is presented in terms of the electric to magnetic form factor squared ratio. This observable is in principle more robust against experimental correlations and global normalizations. The present analysis shows indeed that it is a useful quantity that contains reliable and coherent information. The comparison with the ratio extracted from the measurement of the longitudinal to transverse polarization of the recoil proton in polarized electron–proton scattering shows that the results are compatible. These results bring a decisive piece of information in the controversy on the deviation of the proton form factors from the dipole dependence.

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Authors and Affiliations

  1. IRFU, CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette, France

    Egle Tomasi-Gustafsson

  2. Dipartimento di Fisica e Geologia, INFN Sezione di Perugia, 06123, Perugia, Italy

    Simone Pacetti

Authors
  1. Egle Tomasi-Gustafsson
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  2. Simone Pacetti
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Correspondence to Egle Tomasi-Gustafsson.

Additional information

This article belongs to the Topical Collection “NSTAR 2017 - The International Workshop on the Physics of Excited Nucleons”.

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Tomasi-Gustafsson, E., Pacetti, S. Two-Photon Exchange: Myth and History. Few-Body Syst 59, 91 (2018). https://doi.org/10.1007/s00601-018-1416-5

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  • DOI: https://doi.org/10.1007/s00601-018-1416-5

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