Pole trajectories of the \Lambda(1405) help establish its dynamical nature

Recently, BaSc collaboration performed a LatticeQCD simulation of coupled-channel scattering in the energy region around 1.4 GeV by using single-baryon and meson-baryon operators. Their study revealed signatures of a virtual state below the pi-Sigma threshold and the well-established resonance pole just below the KbarN threshold.

A research team from the university of Valencia and Beihang University has analyzed these scattering data and extracted the quark mass dependence of the two poles, confirming the Lambda(1405) exotic nature. The study  also disclose the structure of the exotic baryon at the flavor-symmetric limit. At this limit, both poles become bound states. The study is also consistent with the experimental observations at the physical pion mass, obtaining compatible scattering cross sections. Thus, for the first time, agreement between experiment, LatticeQCD and phenomenological studies based on unitarized chiral perturbation theory, is found. The results presented here are crucial to shed light on the molecular nature of exotic strange baryon resonances and also for excited nuclei.

---

---