https://doi.org/10.1140/epja/i2011-11077-4
Regular Article - Theoretical Physics
Determination of two-photon exchange amplitudes from elastic electron-proton scattering data
1
Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099, Mainz, Germany
2
Helmholtz Institut Mainz, Johannes Gutenberg-Universität, D-55099, Mainz, Germany
3
Petersburg Nuclear Physics Institute, 188350, St. Petersburg, Russia
4
Physics Department, College of William and Mary, 23187, Williamsburg, VA, USA
* e-mail: marcvdh@kph.uni-mainz.de
Received:
27
February
2011
Revised:
22
April
2011
Accepted:
10
May
2011
Published online:
16
June
2011
Using the available cross-section and polarization data for elastic electron-proton scattering, we provide an extraction of the two-photon exchange amplitudes at a common value of four-momentum transfer, around Q 2 = 2.5 GeV^2. This analysis also predicts the e + p/e - p elastic-scattering cross-section ratio, which will be measured by forthcoming experiments.
© SIF, Springer-Verlag Berlin Heidelberg, 2011
