Two-photon exchange from intermediate state resonances in elastic electron-proton scattering

Ahmed, Jaseer; Blunden, P. G.; Melnitchouk, W.

doi:10.1103/physrevc.102.045205

Title: Two-photon exchange from intermediate state resonances in elastic electron-proton scattering

Journal Article · Mon Oct 26 00:00:00 EDT 2020 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.102.045205· OSTI ID:1687372

^[1];

^[1]; Melnitchouk, W. ^[2]

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

In this paper, we use a recently developed dispersive approach to compute the two-photon exchange (TPE) correction to elastic electron-proton scattering, including contributions from hadronic $$J^P=1/2^\pm$$ and $$3/2^\pm$$ resonant intermediate states below~1.8~GeV. For the transition amplitudes from the proton ground state to the resonant excited states we employ new exclusive meson electroproduction data from CLAS at $$Q^2 \lesssim 5$$~GeV$^2$, and we explore the effects of both fixed and dynamic widths for the resonances. Among the resonant states, the $$N(1520)~\!3/2^-$$ becomes dominant for $$Q^2 \gtrsim 2$$~GeV$^2$, with a sign opposite to the comparably sized $$\Delta(1232)~\!3/2^+$$ contribution, leading to an overall increase in the size of the TPE correction to the cross section relative to the nucleon only contribution at higher $Q^2$ values. The results are in good overall agreement with recent $e^+ p$ to $e^- p$ cross section ratio and polarization transfer measurements, and provide compelling evidence for a resolution of the electric to magnetic form factor ratio discrepancy.

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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:: 1687372

Report Number(s):: JLAB-THY-20-3212; DOE/OR/23177-5065; arXiv:2006.12543; TRN: US2204120

Journal Information:: Physical Review. C, Vol. 102, Issue 4; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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