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.

Original languageEnglish
Article number042001
Number of pages8
JournalPhysical Review Letters
Volume122
Issue number4
DOIs
Publication statusPublished - 29 Jan 2019

Keywords

  • FINAL-STATE INTERACTIONS
  • SPIN ASYMMETRIES
  • LAMBDA
  • GAUGE

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