The self-energy of improved staggered quarks

TL;DR

This paper computes the fermion self-energy at one-loop order for an improved staggered quark action in lattice QCD, demonstrating the effectiveness of a new algebraic perturbation theory approach.

Contribution

It introduces and applies a novel algebraic method to calculate self-energy for improved lattice actions, enhancing computational efficiency.

Findings

Successful calculation of fermion self-energy at O(alpha_s)

Validation of the algebraic approach for improved actions

Potential for improved accuracy in lattice QCD simulations

Abstract

We calculate the fermion self-energy at O(alpha_s) for the Symanzik improved staggered fermion action used in recent lattice simulations by the MILC collaboration. We demonstrate that the algebraic approach to lattice perturbation theory, suggested by us recently, is a powerful tool also for improved lattice actions.