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

Blunden, P. G.; Melnitchouk, W.

doi:10.1103/PhysRevC.95.065209

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

Journal Article · Wed Jun 14 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.065209· OSTI ID:1364116

Blunden, P. G. ^[1]; Melnitchouk, W. ^[2]

Univ. of Manitoba, Winnipeg, MB (Canada); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

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.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1364116

Alternate ID(s):: OSTI ID: 1363977

Report Number(s):: JLAB-THY-17-2430; DOE/OR/23177-4083; arXiv:1703.06181; PRVCAN

Journal Information:: Physical Review C, Vol. 95, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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Electromagnetic excitation of the Delta(1232)-resonance Pascalutsa, Vladimir; Vanderhaeghen, Marc; Yang, Shin Nan arXiv https://doi.org/10.48550/arxiv.hep-ph/0609004	text	January 2006
Radiative Corrections to Electron-Proton Scattering Maximon, L. C.; Tjon, J. A. arXiv https://doi.org/10.48550/arxiv.nucl-th/0002058	text	January 2000
$Δ$ resonance contribution to two-photon exchange in electron-proton scattering Kondratyuk, S.; Blunden, P. G.; Melnitchouk, W. arXiv https://doi.org/10.48550/arxiv.nucl-th/0506026	text	January 2005
Two-photon exchange in elastic electron-nucleon scattering Blunden, P. G.; Melnitchouk, W.; Tjon, J. A. arXiv https://doi.org/10.48550/arxiv.nucl-th/0506039	text	January 2005

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Two-Photon Exchange: Future Experimental Prospects Bernauer, Jan C. Few-Body Systems, Vol. 59, Issue 6 https://doi.org/10.1007/s00601-018-1439-y	journal	July 2018
Lepton mass effects for beam-normal single-spin asymmetry in elastic muon-proton scattering Koshchii, Oleksandr; Afanasev, Andrei Physical Review D, Vol. 100, Issue 9 https://doi.org/10.1103/physrevd.100.096020	journal	November 2019
Lepton mass effects for beam-normal single-spin asymmetry in elastic muon-proton scattering Koshchii, Oleksandr; Afanasev, Andrei arXiv https://doi.org/10.48550/arxiv.1905.10217	text	January 2019

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