Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Precision tests of Quantum Mechanics and CPT symmetry with entangled neutral kaons at KLOE

Jul 7, 2022, 6:25 PM
17m
Room 9 (Indaco)

Room 9 (Indaco)

Parallel Talk Quark and Lepton Flavour Physics Quark and Lepton Flavour Physics

Speaker

Eryk Czerwiński (Institute of Physics, Jagiellonian University)

Description

The quantum interference between the decays of entangled neutral kaons is a very powerful tool for testing the quantum coherence of the entangled kaon pair state. The studied process φ → KS KL → π+ π− π+ π− exhibits the characteristic Einstein–Podolsky–Rosen correlations that prevent both kaons to decay into π + π − at the same time. The newly published result is based on data sample collected with the KLOE detector at DAΦNE and corresponds to an integrated luminosity of about 1.7 fb−1 , i.e. to ∼ 1.7 × 10^9 φ → KS KL decays. From the fit of the observed time difference distribution of the two kaon decays, the decoherence and CPT violation parameters of various phenomenological models are measured. A stringent upper limit on the branching ratio of the φ → KSKS, KLKL decay is also derived. Independently, the comparison of neutral meson transition rates between flavour and CP eigenstates allows direct and model independent tests of time-reversal T and CPT symmetries, through ratios of rates of two classes of processes:$K_S K_L \to \pi^\pm e^\mp \nu, 3 \pi^0$ and $K_S K_L \to \pi^+ \pi^-, \pi^\pm e^\mp \nu$. In addition to this a straightforward extension to the case of CPT symmetry was performed providing us with the first model independent test of CPT symmetry violation in transitions of neutral kaons.

In-person participation Yes

Primary author

Eryk Czerwiński (Institute of Physics, Jagiellonian University)

Presentation materials