Speakers
Description
The interaction among nucleons and double-strange $\Xi^-$ baryons is an important ingredient for the equation of state of neutron stars.
In classical experimental methods, information on the strangeness S=-2 sector is accessed by measuring the binding energy of a $\Xi^-$ hyperon to a nucleus in so called hypernuclei. However, it is difficult to obtain large statistics with such experiments and the interpretation is model dependent, because of the involvement of many-body forces in the system.
The ALICE Collaboration has demonstrated that the femtoscopy method excels in accessing multi-strange interacting systems with high precision. Using the dataset from high-multiplicity $\mathrm{p\kern-0.05em p}$ collisions collected during the Run 2 data-taking period of the LHC, the measured $\mathrm{p}$--$\Xi^-$ and $\mathrm{p}$--$\Omega^-$ correlation functions were used to test Lattice QCD calculations. Since the start of Run 3 in 2022 the ALICE Collaboration has been collecting new data with significant gain in the number of available candidates for two-body analyses. These data also allow for the first time to perform three-body femtoscopic measurements in the strangeness S=-2 sector.
This contribution presents preliminary results on the $\mathrm{p}$--$\Xi^-$ and $\mathrm{p}$--$\mathrm{p}$--$\Xi^-$ correlations in $\mathrm{p\kern-0.05em p}$ collisions obtained with the data collected in the first three years of Run 3. The comparison with Lattice QCD calculations will be shown and discussed for both two- and three-body systems.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | ALICE Collaboration |
