Evidence of transverse polarization of $\hat{I}{ž}^0$ hyperon in $\ddot{I}ˆ(3686)\to \hat{I}{ž}^0\bar{\hat{I}}{ž}^0$

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

Using $(2.712\pm 0.014)\times 10^9$ $\ddot{I}ˆ(3686)$ events collected with the BESIII detector at the BEPCII collider, we report an evidence of $\hat{I}{ž}^0$ transverse polarization with a si…