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Title: Dispersive approach to two-photon exchange in elastic electron-proton scattering

We examine the two-photon exchange corrections to elastic electron-nucleon scattering within a dispersive approach, including contributions from both nucleon and Δ intermediate states. The dispersive analysis avoids off-shell uncertainties inherent in traditional approaches based on direct evaluation of loop diagrams, and guarantees the correct unitary behavior in the high energy limit. Using empirical information on the electromagnetic nucleon elastic and NΔ transition form factors, we compute the two-photon exchange corrections both algebraically and numerically. Finally, results are compared with recent measurements of e + p to e - p cross section ratios from the CLAS, VEPP-3 and OLYMPUS experiments.
Authors:
 [1] ;  [2]
  1. Univ. of Manitoba, Winnipeg, MB (Canada); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
Report Number(s):
JLAB-THY-17-2430; DOE/OR/23177-4083; arXiv:1703.06181
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1364116
Alternate Identifier(s):
OSTI ID: 1363977

Blunden, P. G., and Melnitchouk, W.. Dispersive approach to two-photon exchange in elastic electron-proton scattering. United States: N. p., Web. doi:10.1103/PhysRevC.95.065209.
Blunden, P. G., & Melnitchouk, W.. Dispersive approach to two-photon exchange in elastic electron-proton scattering. United States. doi:10.1103/PhysRevC.95.065209.
Blunden, P. G., and Melnitchouk, W.. 2017. "Dispersive approach to two-photon exchange in elastic electron-proton scattering". United States. doi:10.1103/PhysRevC.95.065209. https://www.osti.gov/servlets/purl/1364116.
@article{osti_1364116,
title = {Dispersive approach to two-photon exchange in elastic electron-proton scattering},
author = {Blunden, P. G. and Melnitchouk, W.},
abstractNote = {We examine the two-photon exchange corrections to elastic electron-nucleon scattering within a dispersive approach, including contributions from both nucleon and Δ intermediate states. The dispersive analysis avoids off-shell uncertainties inherent in traditional approaches based on direct evaluation of loop diagrams, and guarantees the correct unitary behavior in the high energy limit. Using empirical information on the electromagnetic nucleon elastic and NΔ transition form factors, we compute the two-photon exchange corrections both algebraically and numerically. Finally, results are compared with recent measurements of e+ p to e- p cross section ratios from the CLAS, VEPP-3 and OLYMPUS experiments.},
doi = {10.1103/PhysRevC.95.065209},
journal = {Physical Review C},
number = 6,
volume = 95,
place = {United States},
year = {2017},
month = {6}
}