Isovector axial form factor of the nucleon from lattice QCD
Dalibor Djukanovic, Georg von Hippel, J. Koponen, Harvey B. Meyer, Konstantin Ottnad, Tobias Schulz, Hartmut Wittig
Abstract
The isovector axial form factor of the nucleon plays a key role in interpreting data from long-baseline neutrino oscillation experiments. We perform a lattice-QCD based calculation of this form factor, introducing a new method to directly extract its $z$ expansion from lattice correlators. Our final parametrization of the form factor, which extends up to spacelike virtualities of $0.7\text{ }\text{ }{\mathrm{GeV}}^{2}$ with fully quantified uncertainties, agrees with previous lattice calculations but is significantly less steep than neutrino-deuterium scattering data suggests.
Topics & Concepts
IsovectorPhysicsLattice QCDNucleonLattice (music)Parametrization (atmospheric modeling)Particle physicsNuclear physicsQuantum chromodynamicsForm factor (electronics)BaryonScatteringLattice field theoryDeuteriumQuantum mechanicsAcousticsRadiative transferParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsNeutrino Physics Research