Matching heavy-light currents with NRQCD and HISQ quarks

TL;DR

This paper computes one-loop renormalisation factors for heavy-light currents using lattice perturbation theory, employing NRQCD for heavy quarks and HISQ for light quarks, aiding precise lattice QCD calculations.

Contribution

It provides the first detailed calculation of renormalisation parameters for heavy-light currents combining NRQCD and HISQ actions.

Findings

Calculated renormalisation parameters for heavy-light currents.

Results applicable to massless HISQ light quarks.

Brief discussion on extension to heavy-heavy currents.

Abstract

We calculate the one loop renormalisation parameters for the heavy-light axial-vector and vector currents using lattice perturbation theory. We use NonRelativistic QCD (NRQCD) heavy quarks and the Highly Improved Staggered Quark (HISQ) action for the light quarks. We present results for heavy-light currents with massless HISQ quarks and briefly discuss the extension to heavy-heavy currents with massive HISQ quarks.