Guan Y. et al.Vossen, A.A.VossenAdachi, I.I.AdachiAdamczyk, K.K.AdamczykAhn, J.K.J.K.AhnAihara, H.H.AiharaAl Said, S.S.Al SaidAsner, D.M.D.M.AsnerAtmacan, H.H.AtmacanAulchenko, V.V.AulchenkoPAO-TI CHANGWEI-SHU HOUMIN-ZU WANG2021-07-282021-07-282019319007https://www.scopus.com/inward/record.uri?eid=2-s2.0-85060981822&doi=10.1103%2fPhysRevLett.122.042001&partnerID=40&md5=b04778cf92811cfcd38b6776e75ad3e2https://scholars.lib.ntu.edu.tw/handle/123456789/574656We report the first observation of the spontaneous polarization of Λ and Λ hyperons transverse to the production plane in e+e- annihilation, which is attributed to the effect arising from a polarizing fragmentation function. For inclusive Λ/Λ production, we also report results with subtracted feed-down contributions from Σ0 and charm. This measurement uses a dataset of 800.4 fb-1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV. We observe a significant polarization that rises with the fractional energy carried by the Λ/Λ hyperon. ? 2019 authors.Positron annihilation; A-center; Belle experiments; E+e- annihilation; Fractional energy; Fragmentation functions; Hyperon polarization; Spontaneous polarizations; Polarizationjournal article10.1103/PhysRevLett.122.042001307683112-s2.0-85060981822