Speaker
Tim Harris
(University of Edinburgh)
Description
In this talk I will outline a strategy to include the effects of the electromagnetic interactions of the sea quarks in QCD+QED. When computing leading order corrections in the electromagnetic coupling, the sea-quark charges result in quark-line disconnected diagrams which are not easily computed using stochastic estimators. An analysis of their variance can help construct better estimators for the relevant traces of quark propagators. I will present preliminary numerical results for the corresponding contributions to the hadronic spectrum using ensembles of domain-wall fermions from the RBC/UKQCD collaboration.
Primary author
Tim Harris
(University of Edinburgh)
