Speaker
Description
The two-particle correlation technique applied to $\Lambda K^-$ pairs in $p-p$ collisions at the LHC has recently provided the most precise experimental information on the strangeness $S=-2$ meson--baryon interaction. In this contribution, we show for the first time how femtoscopic measurements can be used to constrain the parameters of a low-energy effective QCD Lagrangian. The resulting framework provides new insights into the molecular nature of the $\Xi(1620)$ and $\Xi(1690)$ resonances and opens a novel avenue to constrain higher-order terms in effective QCD models, with applications to the multi-strange and charm sectors.
We also investigate the compatibility between the $K^-\Lambda$ correlation function recently measured by the ALICE Collaboration and the $K^-\Lambda$ invariant-mass distribution reported by the LHCb Collaboration in the decay $\Xi_b^- \to J/\psi\,\Lambda\,K^-$. This combined analysis provides complementary constraints on the underlying meson--baryon interaction.