Testing CPT symmetry with multi-strange baryons mass precision measurements using ALICE

by Romain Schotter (Stefan Meyer Institute for Subatomic Physics of the Austrian Academy of Sciences (AT))

Wednesday 11 Dec 2024, 15:00 → 16:00 Europe/Vienna

Vienna, PSK Georg-Coch-Platz 2, 3.OG, Besprechungsraum #1

Abstract:

In any relativistic quantum field theory such as Quantum Chromodynamics or Electroweak theory, the interactions are invariant under the combined operation of Charge conjugation (C), Parity transformation (P) and Time reversal (T). One of the consequences of this (CPT) symmetry is that particles and their corresponding antiparticles must have exactly same mass. While the mass difference between proton and antiproton has been measured to a very high precision, the extension to (multi-)strange baryons domain still lacks precise measurements due to statistical limitations.
The ALICE detector is optimized to reconstruct decays of multi-strange baryons (Ξ and Ω). The collected data in pp at √s = 13 TeV during the LHC Run 2 (almost two billion events), together with the particle identification capabilities of the ALICE detector, allow to measure the mass of the multi-strange hyperons and antihyperons reaching unprecedented precision. In this contribution, the mass differences between Ξ- and Ξ+, and between Ω− and Ω+ will be presented, sensibly improving the precision obtained by averaging the results from previous experiments. 

Chairs:

Claude Amsler, David Chinellato

Seminar_SMI_RomainSchotter.pdf