Speaker
Simone Bacchio
Description
We present results for the nucleon axial and pseudoscalar form factors extrapolated at the continuum limit using three $N_f = 2 + 1 + 1$ twisted mass fermion ensembles with all quark masses tuned to their physical values. Convergence to the ground state matrix elements is assessed using multi-state fits. We study the momentum dependence of the three form factors and check the partially conserved axial-vector current (PCAC) hypothesis and the pion pole dominance (PPD). We show that in the continuum limit, the PCAC and PPD relations are satisfied. We also show that the Goldberger-Treimann relation is approximately fulfilled and determine the Goldberger-Treiman discrepancy.
Primary authors
Simone Bacchio
Constantia Alexandrou
(University of Cyprus & Cyprus Institute)
Giannis Koutsou
(The Cyprus Institute)
Gregoris Spanoudes
(University of Cyprus)
