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We report the first observation of the polarization of$\Lambda/\bar{\Lambda}$ hyperons transverse to its production plane in $e^+e^-$annihilation. We observe a significant polarization that rises with thefractional energy carried by the hyperon as well as its transverse momentum. Todefine the production plane, we use the direction of the hyperon momentumtogether with either the thrust axis in the event or the momentum vector of ahadron in the opposite hemisphere. Furthermore, we investigate thecontributions to the hyperon polarization from the feed-down from$\Sigma^0/\bar{\Sigma}^0$ and $\Lambda_c^{\pm}$ decays. This measurement uses adataset of 800.4\~fb$^{-1}$ collected by the Belle experiment at or near acenter-of-mass energy of 10.58 GeV.

Observation of Transverse $\Lambda/\bar{\Lambda}$ Hyperon Polarization in $e^+e^-$ Annihilation at Belle