Heavy-quark symmetries in the light of nonperturbative QCD approaches

TL;DR

This paper critically examines heavy-quark symmetries in nonperturbative QCD frameworks, assessing their validity in decay constants and form factors, and provides new predictions for specific effective couplings based on Dyson-Schwinger equations.

Contribution

It offers a critical review of heavy-quark symmetries within a Dyson-Schwinger equation-based nonperturbative QCD approach and predicts new effective couplings.

Findings

Validation of heavy-quark symmetries in certain decay constants.

Predictions for g_{DsDK} and g_{BsBK} couplings.

Insights into nonperturbative QCD effects on heavy-light systems.

Abstract

We critically review the validity of heavy-quark spin and flavor symmetries in heavy-light decay constants, form factors and effective couplings obtained within a nonperturbative framework, the ingredients of which are all motivated by Dyson-Schwinger equations studies of QCD. Along the way, we make new predictions for two effective nonphysical couplings: g_{DsDK} = 24.1+2.5/-1.6 and g_{BsBK} = 33.3+4.0/-3.7.