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The isovector axial form factor of the nucleon plays a key role ininterpreting data from long-baseline neutrino oscillation experiments. Weperform a lattice-QCD based calculation of this form factor, introducing a newmethod to directly extract its $z$-expansion from lattice correlators. Ourfinal parametrization of the form factor, which extends up to spacelikevirtualities of $0.7\,{\rm GeV}^2$ with fully quantified uncertainties, agreeswith previous lattice calculations but is significantly less steep thanneutrino-deuterium scattering data suggests.

The isovector axial form factor of the nucleon from lattice QCD