O(a) improvement of the HYP static axial and vector currents at one-loop order of perturbation theory

Grimbach, A.; Guazzini, D.; Knechtli, F.; Palombi, F.

O(a) improvement of the HYP static axial and vector currents at one-loop order of perturbation theory

Authors

Description

We calculate analytically the improvement coefficients of the static axial and vector currents in O(a) improved lattice QCD at one-loop order of perturbation theory. The static quark is described by the hypercubic action, previously introduced in the literature in order to improve the signal-to-noise ratio of static observables. Within a Schroedinger Functional setup, we derive the Feynman rules of the hypercubic link in time-momentum representation. The improvement coefficients are obtained from on-shell correlators of the static axial and vector currents. As a by-product, we localise the minimum of the static self-energy as a function of the smearing parameters of the action at one-loop order and show that the perturbative minimum is close to its non-perturbative counterpart.
24 pages, 7 figures