Journal Article

Precision tests of quantum mechanics and CPT symmetry with entangled neutral kaons at KLOE

Kupsc, A., De Leo, V., Berlowski, M., Di Domenico, A., Kozyrev, E. A., Mandaglio, G., Danè, E., Messi, R., Sirghi, F., Di Cicco, A., Venanzoni, G., Gauzzi, P., Ceradini, F., Diociaiuti, E., Moskal, P., Selce, A., Fantini, A., Cao, B., Schioppa, M., Giovannella, S., Johansson, T., Miscetti, S., Fermani, P., Martini, M., Santangelo, P., Branchini, P., Budano, A., Moricciani, D., De Lucia, E., Lukin, P. A., Silarski, M., D’Uffizi, A., Patera, V., Ciambrone, P., Krzemien, W., Kang, X., Fantini, G., Bossi, F., Curciarello, F., Babusci, D., Czerwiński, E., Domenici, D., Tortora, L., De Santis, A., Fiore, S., Ivanov, V. L., Perez del Rio, E., Gajos, A., Graziani, E., Passeri, A., De Simone, P., Wiślicki, W., Bloise, C., D’Agostini, G., Kisielewska-Kamińska, D., D’Amico, R., Solodov, E. P., Wolke, M.

2022

Overview

A bstract The quantum interference between the decays of entangled neutral kaons is studied in the process ϕ → K S K L → π + π − π + π − , which exhibits the characteristic Einstein-Podolsky-Rosen correlations that prevent both kaons to decay into π + π − at the same time. This constitutes a very powerful tool for testing at the utmost precision the quantum coherence of the entangled kaon pair state, and to search for tiny decoherence and CPT violation effects, which may be justified in a quantum gravity framework. The analysed data sample was collected with the KLOE detector at DAΦNE, the Frascati ϕ -factory, and corresponds to an integrated luminosity of about 1.7 fb − 1 , i.e. to about 1 . 7 × 10 9 ϕ → K S K L decays produced. From the fit of the observed ∆ t distribution, being ∆ t the difference of the kaon decay times, the decoherence and CPT violation parameters of various phenomenological models are measured with a largely improved accuracy with respect to previous analyses. The results are consistent with no deviation from quantum mechanics and CPT symmetry, while for some parameters the precision reaches the interesting level at which — in the most optimistic scenarios — quantum gravity effects might show up. They provide the most stringent limits up to date on the considered models.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Beyond Standard Model / Classical and Quantum Gravitation / Coherence / Decay / e(+)-e(-) Experiments / Elementary Particles / High energy physics / Kaons / Luminosity / Mathematical models / Parameters / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum gravity / Quantum mechanics / Quantum phenomena / Quantum Physics / Regular Article - Experimental Physics / Relativity Theory / String Theory / Symmetry