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

  • Regular Article - Experimental Physics
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Abstract

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 (\(Q^2\)). This discrepancy is generally attributed to neglected two-photon exchange (TPE) corrections. At larger \(Q^2\) 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 \(Q^2\) values below where a clear discrepancy is observed. 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.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: There is no data to be deposited. All data shown are taken from the publications referenced in the paper.]

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Acknowledgements

This work was supported by U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-05CH11231.

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Authors and Affiliations

  1. Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

    John R. Arrington

  2. Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Mikhail Yurov

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  1. John R. Arrington
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  2. Mikhail Yurov
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Correspondence to John R. Arrington.

Additional information

Communicated by Nicolas Alamanos.

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Arrington, J.R., Yurov, M. A measurement of two-photon exchange in Super-Rosenbluth separations with positron beams. Eur. Phys. J. A 57, 319 (2021). https://doi.org/10.1140/epja/s10050-021-00633-2

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