Speaker
Dr
Roger Horsley
(University of Edinburgh)
Description
Quark line disconnected matrix elements of an operator, such
as the axial current, are difficult to compute on the lattice.
The standard method uses a stochastic estimator of the operator,
which is very noisy. We discuss and further develop our alternative
approach using the Feynman-Hellmann theorem which involves
only evaluating two-point correlation functions. This is applied
to computing the contribution of the quark spin to the nucleon
and in particular for the strange quark.
Primary author
Dr
Roger Horsley
(University of Edinburgh)