Finite ma corrections for sea quark matrix elements

TL;DR

This paper investigates finite mass corrections in sea quark matrix element calculations, highlighting their dependence on Lorentz structure and potential reduction via improved actions, with implications for phenomenology.

Contribution

It introduces a detailed analysis of finite mass corrections for sea quark matrix elements and proposes methods to reduce these effects using improved lattice actions.

Findings

Finite $ma$ corrections differ from valence quark normalization.

Corrections depend strongly on the Lorentz structure of the current.

Using a 2-link improved action can reduce correction magnitudes.

Abstract

We discuss the finite $ma$ corrections associated with the computation of sea quark matrix elements. We find them to differ from the standard normalization used for valence quarks and to depend strongly on the Lorentz structure of the current under consideration. Phenomenological implications of these results are briefly discussed in two examples. We also mention how the magnitude of the correction factors can be reduced by using a 2-link improved action.