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Babusci, D.; Berłowski, M.; Bloise, C.; Bossi, F.; Branchini, P.; Cao, B.; Ceradini, F.; Ciambrone, P.; Curciarello, F.; Czerwiński, E.; D'Agostini, G.; D'Amico, R.; Danè, E.; De Leo, V.; De Lucia, E.; De Santis, A.; De Simone, P.; Di Domenico, A.; Diociaiuti, E.; Domenici, D.; D'Uffizi, A.; Fantini, G.; Gajos, A.; Gamrat, S.; Gauzzi, P.; Giovannella, S.; Graziani, E.; Kang, X.; Kupść, A.; Mandaglio, G.; Martini, M.; Miscetti, S.; Moskal, P.; Passeri, A.; Pérez del Río, E.; Schioppa, M.; Selce, A.; Silarski, M.; Sirghi, F.; Solodov, E.P.; Wiślicki, W.; Wolke, M.; Bernabéu, J.
Physics letters. B, 10/2023, Volume: 845Journal Article
Tests of the T, CP and CPT symmetries in the neutral kaon system are performed by the direct comparison of the probabilities of a kaon transition process to its symmetry-conjugate. The exchange of in and out states required for a genuine test involving an antiunitary transformation implied by time-reversal is implemented exploiting the entanglement of K0K‾0 pairs produced at a ϕ-factory. A data sample collected by the KLOE experiment at DAΦNE corresponding to an integrated luminosity of about 1.7 fb−1 is analysed to study the Δt distributions of the ϕ→KSKL→π+π−π±e∓ν and ϕ→KSKL→π±e∓ν3π0 processes, with Δt the difference of the kaon decay times. A comparison of the measured Δt distributions in the asymptotic region Δt≫τS allows to test for the first time T and CPT symmetries in kaon transitions with a precision of few percent, and to observe CP violation with this novel method.
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