October 31, 2023 to November 4, 2023
Europe/Athens timezone

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

Oct 31, 2023, 4:15 PM
Talk in workshop 2: "QCD analysis of nucleon structure" Parallel Workshop 2


Simone Bacchio


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)

Presentation materials