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Two-pole structures in QCD -- a universal phenomenon governed by chiral dynamics by Xie, Jia-Ming; Lu, Jun-Xu; Geng, Li-Sheng; Zou, Bing-Song is a scholarly article available to read on EtoBox.

What is Two-pole structures in QCD -- a universal phenomenon governed by chiral dynamics about?

We illustrate how the two-pole structures of the $\Lambda(1405)$ emerge from the underlying universal chiral dynamics that describe the coupled-channel interactions between octet baryons and pseudo-Nambu-Goldstone bosons. Specifically, we attribute this phenomenon to the form of the leading-order chiral potential, which is of the Weinberg-Tomozawa type. We reveal how the underlying chiral dynamics can be exposed by examining the light-quark mass evolution of the two poles. The latest lattice QCD simulations have indeed found evidence for the existence of the two poles of $\Lambda(1405)$, in qualitative agreement with our predictions. We briefly mention a recent work in which lattice QCD simulations are studied more quantitatively, along with a proposal for how the SU(3) flavor content of the two poles of $\Lambda(1405)$ can be experimentally verified.

Author

Xie, Jia-Ming; Lu, Jun-Xu; Geng, Li-Sheng; Zou, Bing-Song

Published

2025

Language

EN