Reviving old, almost lost knowledge on T and K matrix poles and a link to the contemporary QCD spectrum

TL;DR

This paper revisits historical insights on the relationship between T-matrix, K-matrix, and bare poles, framing them within modern quantum chromodynamics (QCD) spectrum understanding.

Contribution

It consolidates and modernizes old knowledge on T-matrix and K-matrix poles, linking them to current QCD spectral analysis.

Findings

Revised understanding of T and K matrix pole interrelations

Connection established between old pole concepts and modern QCD spectrum

Summarization of historical knowledge in a contemporary context

Abstract

The old knowledge about interrelation among T-matrix, K-matrix and bare poles is summarized and put into modern perspective.