Evidence of transverse polarization of ${\Xi }^0$ hyperon in $\psi (3686)\to {\Xi }^0{\bar{\Xi }}^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +684

Using $(2.712\pm 0.014)\times 10^9$ $\psi (3686)$ events collected with the BESIII detector at the BEPCII collider, we report an evidence of ${\Xi }^0$ transverse polarization with a sign…