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Observation of Transverse $\Lambda/\bar{\Lambda}$ Hyperon Polarization in $e^+e^-$ Annihilation at Belle
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arxiv 1611.06648 v1 pith:ANADFJKN submitted 2016-11-21 hep-ex
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abstract
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 the fractional energy carried by the hyperon as well as its transverse momentum. To define the production plane, we use the direction of the hyperon momentum together with either the thrust axis in the event or the momentum vector of a hadron in the opposite hemisphere. Furthermore, we investigate the contributions to the hyperon polarization from the feed-down from $\Sigma^0/\bar{\Sigma}^0$ and $\Lambda_c^{\pm}$ decays. 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.
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Opportunities for spin physics at EIC
hep-ph 2019-07 unverdicted novelty 2.0 of 10
An overview paper summarizing opportunities to measure electroweak polarized structure functions, PDFs, TMDs, GPDs, GTMDs, and related spin effects at the EIC, noting its essential role for small-x and high-Q2 studies.
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