Precise Measurement of Matter-Antimatter Asymmetry with Entangled Hyperon Antihyperon Pairs

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

A search for $CP$ violation with an entangled system of ${\Xi }^{-}{\bar{\Xi }}^{+}$ pairs is performed, using $(10,087\pm 44)\times 10^6$ $J/\psi$ events collected with the BESIII experiment. A nine…