Speaker
Jeremy Green
(Johannes Gutenberg-Universität Mainz)
Summary
We report recent lattice QCD calculations of the strange nucleon
electromagnetic and axial form factors, $G_E^s$, $G_M^s$,
$G_A^s$, and $G_P^s$. Using a variance-reduction technique called
\emph{hierarchical probing}, we obtain a clear nonzero signal. We
perform model-independent fits of the form factor shapes using
the $z$-expansion. From these, we determine observables such as
the strange charge radius and magnetic moment, and the
contributions from light and strange quark spins to the proton
spin.
