Eur. Phys. J. A (2015) 51: 24
https://doi.org/10.1140/epja/i2015-15024-1

Regular Article - Theoretical Physics

Subtracted dispersion relation formalism for the two-photon exchange correction to elastic electron-proton scattering: Comparison with data

¹ Institut für Kernphysik, Johannes Gutenberg Universität, Mainz, Germany
² PRISMA Cluster of Excellence, Johannes Gutenberg-Universität, Mainz, Germany
³ Department of Physics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine

^* e-mail: tomalak@uni-mainz.de

Received: 22 January 2015
Accepted: 4 February 2015
Published online: 27 February 2015

Abstract

We apply a subtracted dispersion relation formalism with the aim to improve predictions for the two-photon exchange corrections to elastic electron-proton scattering observables at finite momentum transfers. We study the formalism on the elastic contribution, and make a detailed comparison with existing data for unpolarized cross sections as well as polarization transfer observables.