Heavy-light current-current correlators

TL;DR

This paper extends the current-current correlator method to heavy-light mesons using HISQ quarks, aiming to determine nonperturbative Z factors for NRQCD currents, and reports initial results in this challenging area.

Contribution

It introduces the application of the correlator method to heavy-light mesons and provides the first results for nonperturbative Z factors in this context.

Findings

Successful extension of the correlator method to heavy-light systems

Initial determination of nonperturbative Z factors for heavy-light currents

Validation of the method in the HISQ case where Z=1

Abstract

The current-current correlator method has been used successfully to obtain very accurate results for quark masses and the coupling alpha_s. The calculations were done using Highly Improved Staggered Quarks (HISQ) and heavy-heavy meson correlators. We now extend this work to the significantly more challenging heavy-light case, reporting the first results here. The aim is to determine nonperturbative Z factors for NRQCD heavy-light currents, but first we test the method in the HISQ case where Z=1.