Heavy Quarkonium and Nonrelativistic Effective Field Theories

TL;DR

This paper explores the formal structure and effective Lagrangian of potential NRQCD, an effective field theory for heavy quarkonium systems, focusing on ultrasoft degrees of freedom.

Contribution

It provides a detailed analysis of the effective Lagrangian of pNRQCD at current accuracy levels, enhancing understanding of heavy quarkonium modeling.

Findings

Clarified the structure of the pNRQCD effective Lagrangian

Analyzed ultrasoft degrees of freedom in heavy quarkonium

Improved theoretical framework for heavy quarkonium studies

Abstract

We study some general aspects of the formalism of potential NRQCD (pNRQCD), an effective field theory that deals with ultrasoft degrees of freedom in Heavy Quarkonium systems. Specific attention is paid to its effective Lagrangian that it is displayed at the present level of accuracy.