Meson-baryon sigma terms in QCD Sum Rules

TL;DR

This paper uses QCD sum rules to calculate meson-baryon sigma terms, finding values consistent with recent estimates and showing the pion-Delta sigma term is comparable to the pion-nucleon sigma term.

Contribution

It introduces a QCD sum rule approach to evaluate meson-baryon sigma terms, providing new quantitative insights into these quantities.

Findings

Pion-nucleon sigma term aligns with recent larger estimates.

Pion-Delta sigma term is as large as the pion-nucleon sigma term.

Results support the validity of QCD sum rules in this context.

Abstract

We evaluate the pion-nucleon and the pion-Delta sigma terms by employing the method of quantum chromodynamics (QCD) sum rules. The obtained value of the pion-nucleon sigma term is compatible with the larger values already anticipated by the recent calculations. It is also found that the pion-Delta sigma term is as large as the pion-nucleon sigma term.