First measurement of the Λ–Ξ interaction in proton–proton collisions at the LHC

The first experimental information on the strong interaction between $\Lambda$ and $\Xi^-$ strange baryons is presented in this Letter. correlation function of $\Lambda-\Xi^-$ $\overline{\Lambda}-\overline{\Xi}^{+}$ pairs produced high-multiplicity proton-proton (pp) collisions at $\sqrt{s}$ = 13 TeV LHC measured as a relative momentum pair. femtoscopy method used to calculate function, which then compared with theoretical expectations obtained using meson exchange model, chiral effective field theory, Lattice QCD calculations close physical point. Data support predictions small scattering parameters while discarding versions large ones, thus suggesting weak $\Lambda-\Xi^{-}$ interaction. limited statistical significance data does not yet allow one constrain effects coupled channels like $\Sigma-\Xi$ N$-\Omega$.