Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer | Zendy

Andrei Afanasev | Zendy; Stanley J. Brodsky | Zendy; Carl E. Carlson | Zendy; YiChun Chen | Zendy; Marc Vanderhaeghen | Zendy

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Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer

Author(s) -

Andrei Afanasev,

Stanley J. Brodsky,

Carl E. Carlson,

YiChun Chen,

Marc Vanderhaeghen

Publication year - 2005

Publication title -

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Language(s) - English

Resource type - Journals

eISSN - 1550-7998

pISSN - 1550-2368

DOI - 10.1103/physrevd.72.013008

Subject(s) - physics , momentum transfer , parton , compton scattering , photon , scattering , electron , polarization (electrochemistry) , asymmetry , elastic scattering , virtual particle , proton , curvature , quark , quantum electrodynamics , nuclear physics , particle physics , quantum mechanics , chemistry , geometry , mathematics

We estimate the two-photon exchange contribution to elastic electron-protonscattering at large momentum transfer by using a quark-parton representation ofvirtual Compton scattering. We thus can relate the two-photon exchangeamplitude to the generalized parton distributions which also enter in otherwide angle scattering processes. We find that the interference of one- andtwo-photon exchange contribution is able to substantially resolve thedifference between electric form factor measurements from Rosenbluth andpolarization transfer experiments. Two-photon exchange has additionalconsequences which could be experimentally observed, including nonzeropolarization effects and a positron-proton/electron-proton scatteringasymmetry. The predicted Rosenbluth plot is no longer precisely linear; itacquires a measurable curvature, particularly at large laboratory angle.Comment: 38 pages, 22 figure

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