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

TL;DR

This paper reports precise measurements of multi-strange baryon masses and their differences in proton-proton collisions at 13 TeV, providing a new test of CPT symmetry with unprecedented accuracy.

Contribution

It presents the most precise mass measurements of multi-strange baryons and their antiparticles, enabling a direct and highly sensitive CPT symmetry test.

Findings

Mass measurements are significantly more precise than previous results.

No CPT violation observed within the experimental uncertainties.

Results set new limits on CPT symmetry in the multi-strange baryon sector.

Abstract

These proceedings present measurements of the $\Xi^{-}$, $\overline{\Xi}^{+}$, $\Omega^{-}$, $\overline{\Omega}^{+}$ masses and mass differences between particle and anti-particle, in pp collisions at $\sqrt{s} = 13$ TeV collected by the ALICE Collaboration during the LHC Run 2. Relying on a data sample much larger than those used in past experiments, the results improve significantly the values obtained from previous measurements and thus offer the opportunity to test directly the CPT symmetry to an unprecedented level of precision in the multi-strange baryon sector.