Tests of $C P$ symmetry in entangled $Ξ^0 − \barΞ^0$ pairs
BESIII Collaboration, М. Н. Ачасов, M. N. Achasov, P. Adlarson et autres
The $J/ψ\to Ξ^0 \barΞ^{0}$ process and subsequent decays are investigated using $(10087 \pm 44)\times 10^6$ $J/ψ$ events collected at the BESIII experiment. The decay parameters of $Ξ^0$ and $\barΞ^0$ are measured with greatly improved precision over previous measurements to be $α_Ξ = …