Low-energy moments of non-diagonal quark current correlators at four loops

TL;DR

This paper calculates the four-loop low-energy expansion terms of heavy-light quark current correlators, providing precise theoretical insights relevant for electroweak precision measurements.

Contribution

It presents the first four-loop computation of low-energy moments of non-diagonal quark current correlators, advancing theoretical accuracy in quantum chromodynamics.

Findings

Computed four-loop low-energy moments of heavy-light quark correlators

Reproduced top-induced non-singlet correction to the electroweak rho parameter

Enhanced precision in theoretical predictions for quark current interactions

Abstract

We compute the leading four physical terms in the low-energy expansions of heavy-light quark current correlators at four-loop order. As a by-product we reproduce the corresponding top-induced non-singlet correction to the electroweak rho parameter.