A new generation of hadron-hadron interaction measurements with ALICE

<!--HTML--><p><span>The study of the effective strong interaction among hadron pairs was pursued in the past via scattering experiments.&nbsp;</span></p> <p><span>For hyperon-nucleon pairs&nbsp;</span><span>such&nbsp;</span><span>as&nbsp;</span><span>Lamba-</span><span>p,&nbsp;</span><span>Sigma-</span><span>p,&nbsp;</span><span>Xi-</span><span>p the nature of the instable hyperon beams makes such measurements very difficult and consequently only scarce experimental data are available. Hyperon-hyperon interactions cannot be accessed at all.</span><span> This kind of interactions is&nbsp;particularly interesting because of its connection to the physics of neutron stars. Indeed, these strong interactions drive the equation of state (EoS) of dense neutron-rich matter with strange quark&nbsp;content and such EoS can be tested against the measurements of neutron star masses, radii and newly detected&nbsp;gravitational wave signals. Since one of the plausible hypotheses about the unknown content of neutron stars is that neutrons and hyperons are contained in the core, a detailed knowledge of the interaction becomes mandatory to verify this hypothesis. </span></p> <p><span>In this talk we show how p+p and p+Pb collisions measured by ALICE at the LHC can be exploited to study these hyperon-nucleon and hyperon-hyperon interactions with unprecedented precision. Among others, we have observed for the first time the attractive p</span><span>Xi</span><span>- strong interactions.&nbsp; Implications for neutron star will be discussed.</span><span> Our correlation analysis opens a new era for hadron physics with strangeness substituting scattering experiments. This will provide us with precise constraints for the EoS of neutron-rich matter with hyperon content.</span></p>