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  • Letter
  • Open Access

Nucleon axial radius

Yi Chen1,*, Yang Li1,†, Cédric Lorcé2,‡, and Qun Wang1,3,§

  • *Contact author: physchen@mail.ustc.edu.cn
  • †Contact author: leeyoung1987@ustc.edu.cn
  • ‡Contact author: cedric.lorce@polytechnique.edu
  • §Contact author: qunwang@ustc.edu.cn
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Phys. Rev. D 110, L091503 – Published 26 November, 2024

DOI: https://doi.org/10.1103/PhysRevD.110.L091503

Abstract

We present the first systematic study of the relativistic axial-vector four-current distributions inside a nucleon. We show in particular that the slope of the axial form factor GA(Q2) in the forward limit—conventionally denoted as RA2 in the literature—does not represent the three-dimensional mean-square axial radius in the Breit frame, but corresponds instead to a contribution to the mean-square spin radius. We derive explicit expressions for the latter in different frames and find in general additional contributions that depend on both the nucleon mass and the forward values of the axial-vector form factors GA(0) and GP(0). This provides an additional key motivation for ongoing lattice quantum chromodynamics (QCD) calculations and future experimental measurements of the induced pseudoscalar form factor GP(Q2).

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Phys. Rev. D 110, L091503– Published 26 November, 2024
  • Received 26 June 2024
  • Accepted 5 November 2024
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