Femtoscopic study of coupled-channels NΞ and Λ Λ interactions

The momentum correlation functions of S = -2 baryon pairs (p Xi(-) and Lambda Lambda) produced in high-energy pp and pA collisions are investigated on the basis of the coupled-channels formalism. The strong interaction is described by the coupled-channels HAL QCD potential obtained by lattice QCD simulations near physical quark masses, while the hadronic source function is taken to be a static Gaussian form. The coupled-channels effect, the threshold difference, the realistic strong interaction, and the Coulomb interaction are fully taken into account for the first time in the femtoscopic analysis of baryon-baryon correlations. The characteristic features of the experimental data for the p Xi(-) and Lambda Lambda pairs at the Large Hadron Collider are reproduced quantitatively with a suitable choice of nonfemtoscopic parameters and the source size. The agreement between theory and experiment indicates that the N Xi (Lambda Lambda) interaction is moderately (weakly) attractive without having a quasibound (bound) state.

Automated summary

Investigation of momentum correlation functions of S = -2 baryon pairs in high-energy collisions shows that the NΞ (ΛΛ) interaction is moderately (weakly) attractive, without forming a quasi-bound (bound) state.