Two-pole structures in QCD -- a universal phenomenon governed by chiral dynamics
arXiv:2504.03392
Abstract
We illustrate how the two-pole structures of the 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 , 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 can be experimentally verified.
15 pages, 4 figures; plenary talk at the 11th International Workshop on Chiral Dynamics (CD2024)