Constraining the low-energy S=-2 meson-baryon interaction with two-particle correlations

TL;DR

This paper uses femtoscopic two-particle correlation data from LHC to constrain low-energy effective QCD models for strangeness S=-2 interactions, providing insights into exotic baryon states and guiding future theoretical developments.

Contribution

First application of femtoscopic data to constrain low-energy QCD effective models for S=-2 meson-baryon interactions.

Findings

New constraints on the parameters of a low-energy effective QCD Lagrangian.

Insights into the molecular nature of $ ext{Xi}(1620)$ and $ ext{Xi}(1690)$ states.

Potential to determine higher order corrections in QCD models.

Abstract

The two-particle correlation technique applied to $K^-\Lambda$ pairs in pp collisions at LHC recently provided the most precise data on the strangeness $S=-2$ meson-baryon interaction. In this letter, we use for the first time femtoscopic data to constrain the parameters of a low-energy effective QCD Lagrangian. The tuned model delivers new insights on the molecular nature of the $\Xi(1620)$ and $\Xi(1690)$ states. This procedure opens the possibility to determine higher order corrections, directly constraining QCD effective models particularly in the multi-strange and charm sectors.