12:30-13:00
Speaker : Ms. Ting Cheng (Max-Planck-Institute for Nuclear Physics in Heidelberg, Germany)

Abstract :
Lorentz-invariance, and locality indicate a conservation of CPT in a causal, unitary and Hermitian quantum field theory, implying that fundamental properties of particles and antiparticles should be equal in magnitude. We compare experiments that could test the mass difference between a particle and its antiparticle and pay a special attention to the Penning trap experiments, which test CPT symmetry by comparing the charge-to-mass ratio measured from cyclotron frequencies of proton and antiproton. We point out how the bounds on CPT violation from the kaon oscillation experiment would be magnitudes above its sensitivity. This is shown by mass decomposition of hadrons using the energy-momentum tensor in QCD. Finally, including CPT tests from comparing neutrino and antineutrino oscillation into discussion, we review their hits towards Lorentz-invariance violation and/or non-locality, and how (micro-)causality is broken and possibly restored.