Two-photon exchange measurements with positrons and electrons

Abstract

Two-photon exchange contributions have potentially broad ranging impact on several charged lepton scattering measurements. Previously believed to be extremely small, based in part on comparisons of positron scattering and electron scattering in the 1950s and 1960s, recent data suggest that the corrections may be larger than expected, in particular in kinematic regions that were inaccessible in these early positron scattering measurements. Additional measurements using positron beams at Jefferson Lab would allow for a detailed investigation of these contributions in a range of reactions and observables.

6 pages, proceedings from the International Workshop on Positrons at Jefferson Lab (JPOS09), Jefferson Lab, Newport News, VA, March 25-27, 2009

References in corpus (2)

• Proton structure corrections to electronic and muonic hydrogen hyperfine splitting
• Detailed analysis of two-boson exchange in parity-violating e-p scattering

Cited by in corpus (5)

• Two-photon exchange in elastic electron-proton scattering
• Measurement of two-photon exchange effect by comparing elastic $e^{\pm }p$ cross sections
• A dispersive approach to two-photon exchange in elastic electron-proton scattering
• Demonstration of a novel technique to measure two-photon exchange effects in elastic $e^{\pm }p$ scattering
• TPEcalc: a program for calculation of two-photon exchange amplitudes