A measurement of two-photon exchange in Super-Rosenbluth separations with positron beams

Arrington, John R.; Yurov, Mikhail

doi:10.1140/epja/s10050-021-00633-2

A measurement of two-photon exchange in Super-Rosenbluth separations with positron beams

Journal Article · Mon Nov 29 00:00:00 EST 2021 · European Physical Journal. A

DOI:https://doi.org/10.1140/epja/s10050-021-00633-2· OSTI ID:1840955

^[1]; Yurov, Mikhail ^[2]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The proton electric and magnetic form factors, G_E and G_M, are intrinsically connected to the spatial distribution of charge and magnetization in the proton. For decades, Rosenbluth separation measurements of the angular dependence of elastic e--p scattering were used to extract G_E and G_M. More recently, polarized electron scattering measurements, aiming to improve the precision of G_E extractions, showed significant disagreement with Rosenbluth measurements at large momentum transfers (Q²). This discrepancy is generally attributed to neglected two-photon exchange (TPE) corrections. At larger Q² values, a new ‘Super-Rosenbluth’ technique was used to improve the precision of the Rosenbluth extraction, allowing for a better quantification of the discrepancy, while comparisons of e⁺-p and e^--p scattering indicated the presence of TPE corrections, but at Q² values below where a clear discrepancy is observed. Here, in this work, we demonstrate the significant benefits to combining the Super-Rosenbluth technique with positron beam measurements. This approach provides a greater kinematic reach and is insensitive to some of the key systematic uncertainties in previous positron measurements.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: 89233218CNA000001; AC02-05CH11231

OSTI ID:: 1840955

Alternate ID(s):: OSTI ID: 1898354
OSTI ID: 23101365

Report Number(s):: LA-UR-21-21766; ark:/13030/qt16j430sf

Journal Information:: European Physical Journal. A, Journal Name: European Physical Journal. A Journal Issue: 11 Vol. 57; ISSN 1434-6001

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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