PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T08 Flavour Physics and CP Violation
Direct tests of T, CP, CPT symmetries in transitions of neutral K mesons with the KLOE experiment
C. Bloise*  on behalf of the KLOE-2 Collaboration
Full text: pdf
Pre-published on: February 20, 2024
Published on: March 21, 2024
A data sample of 1.7 fb$^{-1}$ has been analyzed by the KLOE experiment at
DA$\Phi$NE to study the distribution of the difference in the kaon decay times $\Delta t$, of
$\phi\rightarrow K_S K_L\rightarrow\pi^+\pi^- \,\,\, \pi^{\pm} e^{\mp} \nu $ and
$\phi\rightarrow K_S K_L\rightarrow \pi^{\pm} e^{\mp} \nu \,\,\, \pi^{0} \pi^0 \pi^0$.
Tests of T, CP and CPT symmetries in the neutral kaon system are performed by direct comparison of the probabilities of a kaon transition process and the symmetry-conjugate transition. The exchange of "in" and "out" states required for genuine T and CPT tests
is fulfilled exploiting the entanglement of kaon pairs produced at the $\phi$-factory.
We were able, by the comparison of the measured $\Delta t$ distributions in the asymptotic region $\Delta t \gg \tau_S$, to directly test for the first time T and CPT symmetries in kaon transitions with a few percent precision and to observe CP violation in transitions from CP odd eigenstates to flavour eigenstates, $K^0$ and $\overline K^0$.
DOI: https://doi.org/10.22323/1.449.0372
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