Spin polarization of $\Lambda$ hyperons in $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ at BESIII

Cui Li, Karin Schoenning

The BESIII collaboration here reports the first observation of polarized $\Lambda$ and $\bar{\Lambda }$ hyperons produced in two different processes: i) the resonant $e^{+}{e}^{-}\to J/\psi \to \Lambda \bar{\Lambda }$, us…