Nucleon axial and pseudoscalar form factors from lattice QCD at the physical point

We compute the nucleon axial and induced pseudoscalar form factors using three ensembles of gauge configurations, generated with dynamical light quarks with mass tuned to approximately their physical value. One of the ensembles also includes the strange and charm quarks with their mass close to physical. The latter ensemble has large statistics and finer lattice spacing and it is used to obtain final results, while the other two are used for assessing volume effects. The pseudoscalar form factor is also computed using these ensembles. We examine the momentum dependence of these form factors as well as relations based on pion pole dominance and the partially conserved axial-vector current hypothesis.

Automated summary

The nucleon axial and induced pseudoscalar form factors are computed using three ensembles of gauge configurations, one of which includes strange and charm quarks. The latter ensemble with finer lattice spacing and larger statistics is used for final results, while the other two are used to assess volume effects. The momentum dependence of these form factors and their relations based on pion pole dominance and the partially conserved axial-vector current hypothesis are examined.