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Radiative corrections to the parity-violating spin asymmetry

D. H. Jakubassa-Amundsen1,* and X. Roca-Maza2,3,4,5,†

  • *Contact author: dj@math.lmu.de
  • †Contact author: xavier.roca.maza@fqa.ub.es
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Phys. Rev. C 113, 045502 – Published 29 April, 2026

DOI: https://doi.org/10.1103/2t5l-vqj8

Abstract

The parity-violating spin asymmetry Apv for elastic electron scattering from spin-zero nuclei, together with its QED corrections, is evaluated nonperturbatively within the phase-shift analysis. Dispersion corrections, taking into account low-lying transient nuclear excitations, are estimated with the help of the lowest-order γZ box diagrams. Collision energies in the range 5–500 MeV are considered, and results are provided for the C12 and Pb208 target nuclei. In addition, we have evaluated Apv at GeV energies and small scattering angles—relevant for the Pb Radius Experiment (PREx)—revealing that the low-lying nuclear excited states give no measurable dispersive contribution. However, they are important at lower energies and backward angles.

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Phys. Rev. C 113, 045502– Published 29 April, 2026
  • Received 21 July 2025
  • Revised 23 January 2026
  • Accepted 10 March 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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