Abstract
We present results for the nucleon form factors: electric (), magnetic (), axial (), induced pseudoscalar (), and pseudoscalar () form factors, using the second PACS10 ensemble that is one of three sets of flavor lattice QCD configurations at physical quark masses in large spatial volumes [exceeding ]. The second PACS10 gauge configurations are generated by the PACS Collaboration with the six stout-smeared improved Wilson quark action and Iwasaki gauge action at the second gauge coupling corresponding to the lattice spacing of . We determine the isovector electric, magnetic and axial radii, and magnetic moment from the corresponding form factors, as well as the axial-vector coupling . Combining our previous results for the coarser lattice spacing [E. Shintani et al., Phys. Rev. D 99, 014510 (2019); Phys. Rev. D 102, 019902(E) (2020)], the finite lattice spacing effects on the isovector radii, magnetic moment, and axial-vector coupling are investigated using the difference between the two results. It was found that the effect on is kept smaller than the statistical error of 2% while the effect on the isovector radii was observed as a possible discretization error of about 10%, regardless of the channel. We also report the partially conserved axial-vector current relation using a set of nucleon three-point correlation functions in order to verify the effect by improvement of the axial-vector current.
41 More- Received 24 November 2023
- Accepted 26 February 2024
DOI:https://doi.org/10.1103/PhysRevD.109.094505
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.
Published by the American Physical Society