• Open Access

Updated analysis of recent results on electron and positron elastic scattering on the proton

V. V. Bytev and E. Tomasi-Gustafsson
Phys. Rev. C 99, 025205 – Published 21 February 2019; Erratum Phys. Rev. C 106, 029902 (2022)

Abstract

We discuss recent experimental results concerning the cross section ratio of positron over electron elastic scattering on protons, and compare with the predictions of a pre-existent calculation. The deviation from unity of this ratio, i.e., a charge asymmetry different from zero, is the signature of contributions beyond the Born approximation. After reviewing the published results, we compare the elastic data to a calculation which includes the diagram corresponding to two-photon exchange. It turns out that all the data on the cross section ratio, in the limit of their precision, do not show evidence of enhanced two-photon contribution beyond the expected percent level. Our results confirm that experimental evidence for a large contribution of two-photon exchange is not yet found.

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  • Received 8 June 2018
  • Revised 11 August 2018

DOI:https://doi.org/10.1103/PhysRevC.99.025205

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

Erratum

Authors & Affiliations

V. V. Bytev*

  • JINR-BLTP, 141980 Dubna, Moscow Region, Russian Federation

E. Tomasi-Gustafsson

  • DPhN, IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette Cedex, France

  • *bvv@jinr.ru
  • egle.tomasi@cea.fr

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Issue

Vol. 99, Iss. 2 — February 2019

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