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Isoscalar octet axial form factor of the nucleon from lattice QCD

Alessandro Barone1,*, Dalibor Djukanovic2,3, Georg von Hippel1, Jonna Koponen1, Harvey B. Meyer1,2, Konstantin Ottnad1, and Hartmut Wittig1,2

  • *Contact author: abarone@uni-mainz.de
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Phys. Rev. D 112, 014503 – Published 2 July, 2025

DOI: https://doi.org/10.1103/dc9s-35tb

Abstract

The isoscalar axial-vector form factor of the nucleon plays a key role in understanding the electroweak interaction of nucleons. For the interpretation of the spin structure of the nucleon the nonsinglet isoscalar axial charge is indispensable. Moreover, GAu+d−2s(Q2) together with the isovector and singlet isoscalar form factors are needed for the flavor decomposition of the axial-vector form factor. Detailed knowledge of the flavor decomposition facilitates extractions of Standard Model (SM) parameters from low energy experiments such as the electroweak charge of the proton in the P2 experiment. Here we present a lattice determination of GAu+d−2s(Q2) on Nf=2+1 O(a) improved Wilson fermions, with a full error budget concerning extrapolations and interpolations to the continuum and infinite volume and physical quark masses.

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Phys. Rev. D 112, 014503– Published 2 July, 2025
  • Received 31 March 2025
  • Accepted 16 June 2025
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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. Funded by SCOAP3.

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