Non-perturbative improvement of the vector current in Wilson lattice QCD

Understand

Many observables of interest in lattice QCD are extracted from correlation functions involving the vector current.

• If Wilson fermions are used, it is therefore of practical importance that, besides the action, the current be O($a$) improved in order to remove the leading discretization errors from the observables.
• Here we introduce and apply a new method to determine the improvement coefficient for the two most widely used discretizations of the current.