Abstract
We present results on the isoscalar form factors including the disconnected contributions, as well as on the strange and charm quark form factors. Using previous results on the isovector form factors, we determine the flavor decomposition of the nucleon axial form factors. These are computed using an ensemble of twisted mass fermions simulated with physical values of quark masses. We investigate the SU(3) flavor symmetry and show that there is up to 10% breaking for the axial and up to 50% for the induced pseudoscalar form factors. By fitting the -dependence, we determined the corresponding root mean square radii. The pseudoscalar coupling of the meson and the nucleon is found to be , and the Goldberger-Treiman discrepancy for the octet combination about 50%.
12 More- Received 6 July 2021
- Accepted 14 September 2021
DOI:https://doi.org/10.1103/PhysRevD.104.074503
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