Testing CPT symmetry via precision mass measurements of multi-strange baryons in ALICE

In these proceedings, the measurements of the ${\mathrm{\Xi }}^{-}$, ${\bar{\mathrm{\Xi }}}^{+}$, ${\mathrm{\Omega }}^{-}$, ${\bar{\mathrm{\Omega }}}^{+}$ masses and the mass differences between particle and anti-particle have been measured in pp collisions collected by the ALICE Collaboration during LHC Run 2. The results significantly improve the precision from previous experiments, thus allowing direct tests of CPT symmetry to an unprecedented level of precision in the multi-strange baryon sector.