Observation of Transverse Λ / Λ Hyperon Polarization in e+e- Annihilation at Belle
Journal
Physical Review Letters
Journal Volume
122
Journal Issue
4
Date Issued
2019
Author(s)
Guan Y. et al.
Vossen, A.
Adachi, I.
Adamczyk, K.
Ahn, J.K.
Aihara, H.
Al Said, S.
Asner, D.M.
Atmacan, H.
Aulchenko, V.
Abstract
We 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.
Subjects
Positron annihilation; A-center; Belle experiments; E+e- annihilation; Fractional energy; Fragmentation functions; Hyperon polarization; Spontaneous polarizations; Polarization
Type
journal article