Lepton-Proton Two-Photon Exchange in Chiral Perturbation Theory
Nuclear Theory
2020-02-05 v2 High Energy Physics - Phenomenology
Abstract
We use heavy baryon chiral perturbation theory to evaluate the two-photon exchange corrections to the low-energy elastic lepton-proton scattering at next-to-leading order accuracy, i.e., , including a non-zero lepton mass. We consider the elastic proton intermediate state in the two-photon exchange together in the soft photon approximation. The infrared singular contributions are projected out using dimensional regularization. The resulting infrared singularity-free two-photon exchange contribution is in good numerical agreement with existing predictions based on standard diagrammatic soft photon approximation evaluations.
Keywords
Cite
@article{arxiv.1911.06843,
title = {Lepton-Proton Two-Photon Exchange in Chiral Perturbation Theory},
author = {Pulak Talukdar and Vanamali C. Shastry and Udit Raha and Fred Myhrer},
journal= {arXiv preprint arXiv:1911.06843},
year = {2020}
}
Comments
16 pages, 5 figures. Text slightly revised, results the same. Accepted for publication by Phys.Rev.D