One-loop determination of mass dependent $O(a)$ improvement coefficients for the heavy-light vector and axial-vector currents with relativistic heavy and domain-wall light quarks

TL;DR

This paper calculates one-loop mass-dependent $O(a)$ improvement coefficients for heavy-light vector and axial-vector currents using relativistic heavy and domain-wall light quarks across various gauge actions, revealing symmetry relations.

Contribution

It provides the first detailed one-loop calculation of mass-dependent $O(a)$ improvement coefficients for these currents with relativistic heavy and domain-wall light quarks, including gauge action dependence.

Findings

Exact chiral symmetry leads to relations between vector and axial-vector coefficients.

Results depend on heavy quark mass and domain-wall height.

Calculations performed for multiple gauge actions.

Abstract

We present the one-loop results of the mass dependent $O(a)$ improvement coefficients for the heavy-light vector and axial-vector currents consisting of the relativistic heavy and the domain-wall light quarks. The calculations are performed with the plaquette, Iwasaki and DBW2 gauge actions. The heavy quark mass and domain-wall height dependence is investigated. We point out that the exact chiral symmetry held by the lattice light quark action leads to an exact relation between the improvement coefficients for the vector and axial-vector currents without regard to the lattice heavy quark action.