📝 SummarXiv

Abstract

Meson-baryon systems with strangeness content provide a unique laboratory for investigating the strong interaction and testing theoretical models of hadron structure and dynamics. In this work, the measured correlation functions for oppositely charged $\Xi-{\rm K}$ and $\Xi-\pi$ pairs obtained in high-multiplicity pp collisions at $\sqrt{s} = 13$ TeV at the LHC are presented. For the first time, high-precision data on the $\Xi-{\rm K}$ interaction are delivered at small relative momenta. The scattering lengths, extracted via the Lednick\'y-Lyuboshits expression of the pair wavefunction, indicate a repulsive and a shallow attractive strong interaction for the $\Xi-{\rm K}$ and $\Xi-\pi$ systems, respectively. The $\Xi(1620)$ and $\Xi(1690)$ states are observed in the $\Xi-\pi$ correlation function and their properties, mass and width, are determined. These measurements are in agreement with other available results. Such high-precision data can help refine the understanding of these resonant states, provide stronger constraints for chirally motivated potentials, and address the key challenge of describing the coupled-channel dynamics that may give rise to molecular configurations.