Universal parameters of the $\Lambda(1380)$, the $\Lambda(1405)$ and their isospin partners from a combined analysis of Lattice QCD and experimental results

TL;DR

This paper combines lattice QCD and experimental data within a chiral unitary framework to determine the properties of certain hyperon resonances, quantifying uncertainties and providing new pole position predictions.

Contribution

It introduces a comprehensive analysis integrating lattice and experimental data with systematic uncertainty quantification for hyperon resonances.

Findings

Pole positions for isoscalar resonances at physical and lattice points with uncertainties.

Predictions for isovector states with large uncertainties.

Quantification of systematic uncertainties in resonance parameters.

Abstract

We perform a global analysis of lattice and experimental data on negative-strangeness meson-baryon scattering using a large set of variations of the theoretical framework based on the Chiral Unitary Approach. For the former, the L\"uscher formalism is utilized taking into account all pertinent coupled-channel effects. Through this, systematic uncertainties related to data scarcity, potential ambiguities, and possible framework dependence are quantified for the first time. The implementation of information criteria and other statistical tools is discussed. As a final result we provide pole positions for isoscalar resonances at the physical and lattice points including statistical and systematic uncertainties. Predictions for the isovector states are also provided showing large uncertainties.