The $\Lambda(1405)$ as a Hybrid

TL;DR

This paper uses QCD sum rules to estimate the mass of a strange hybrid baryon, suggesting it could be the long-debated $ ext{Lambda}(1405)$, and discusses potential experimental tests.

Contribution

It provides a novel QCD sum rule calculation indicating the $ ext{Lambda}(1405)$ may be a hybrid baryon, offering a new perspective on its nature.

Findings

Mass estimate aligns with $ ext{Lambda}(1405)$

Supports hybrid baryon interpretation of $ ext{Lambda}(1405)$

Proposes experimental tests for validation

Abstract

Using the QCD Sum Rule Method, we estimate the mass of the lowest strange hybrid baryon with $IJ^P=0(1/2)^-$. We find the mass is approximately that of the $\Lambda(1405)$, whose nature has been a puzzle for many decades. Possible tests of this result are discussed.