Two-Photon Exchange in Elastic Electron-Proton Scattering: A QCD Factorization Approach

Authors:

27 August 2009

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 103 (9) , 092004
DOI:10.1103/physrevlett.103.092004
PMID:19792790

Abstract

We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer

Q^{2}

. It is shown that the leading two-photon exchange amplitude behaves as

1 / Q^{4}

, and can be expressed in a model independent way in terms of the leading twist nucleon distribution amplitudes. Using several models for the nucleon distribution amplitudes, we provide estimates for existing data and for ongoing experiments.

Keywords

All Related Versions

Version 1, 2009-05-03, ArXiv

This publication has 20 references indexed in Scilit:

Two-Photon Physics in Hadronic Processes
Annual Review of Nuclear and Particle Science, 2007
Global analysis of proton elastic form factor data with two-photon exchange corrections
Physical Review C, 2007
Publisher's Note: Proton elastic form factor ratios to $Q^{2} = 3.5 {GeV}^{2}$ by polarization transfer [Phys. Rev. C 71, 055202 (2005)]
Physical Review C, 2005
Proton elastic form factor ratios to $Q^{2} = 3.5 GeV^{2}$ by polarization transfer
Physical Review C, 2005
How to Reconcile the Rosenbluth and the Polarization Transfer Methods in the Measurement of the Proton Form Factors
Physical Review Letters, 2003
Measurement of $G_{E_{p}} / G_{M_{p}}$ in $\vec{e} p \to e \vec{p}$ to $Q^{2} = 5.6 {GeV}^{2}$
Physical Review Letters, 2002
Erratum to: “Higher twist distribution amplitudes of the nucleon in QCD”
Nuclear Physics B, 2001
Higher twist distribution amplitudes of the nucleon in QCD
Nuclear Physics B, 2000
$G_{E_{p}} / G_{M_{p}}$ Ratio by Polarization Transfer in $\vec{e} p \to e \vec{p}$
Physical Review Letters, 2000
Measurements of the electric and magnetic form factors of the proton from $Q^{2}$ =1.75 to 8.83 (GeV/c $)^{2}$
Physical Review D, 1994