Speaker
Description
Systems like $\overline{\rm K}$N and baryon–antibaryon (B$\overline{\rm B}$) are both characterized by the presence of strong inelastic channels at the production threshold, which can affect the properties and the formation of bound states and resonances. The K$^-$p interaction is characterized by the presence of several coupled channels, systems with a similar mass and the same quantum numbers as the $\rm{K}^{-}$p state, like $\rm \overline{K}^0$n and $\rm \pi\Sigma$. The strengths of these couplings to the $\rm{K}^{-}$p are crucial for the understanding of the nature of the $\Lambda(1405)$ and the attractive $\rm{K}^{-}$p strong interaction. Similarly, B$\overline{\rm B}$ systems are characterized by the dominant contribution of several mesonic channels related to the presence of annihilation processes acting below 1~fm. The possible existence of B$\overline{\rm B}$ bound states is still under debate because of the limited amount of data available for the p--p system, and either scarce or no experimental data is available for B$\overline{\rm B}$ systems containing strangeness.
In this talk, femtoscopic correlations measured by ALICE in pp, p–Pb and Pb--Pb collisions are presented. In particular, results on the $\overline{\rm K}$N correlation function are shown, providing for the first time experimental constraints of $\rm \overline{K}^0$n and the $\pi \Sigma$ channels to the measured $\overline{\rm K}$N interaction. Finally, the results from B$\overline{\rm B}$ pairs (p$\overline{\rm p}$, p$\overline \Lambda$ and $\Lambda\overline\Lambda$) are presented. The effect of annihilation channels on the correlation function and a quantitative determination of the inelastic contributions in the three different pairs are also discussed.
