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Novel aspects of baryon-antibaryon production in e + e - annihilations
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Journal Article
Novel aspects of baryon-antibaryon production in e + e - annihilations
2019
Overview
Baryon-antibaryon decays of J /ψ and ψ ‘ produced at an electron-positron collider are presented as a tool to study baryon properties and to test discrete symmetries. We focus on a novel aspect of this process: the transverse polarization of the produced baryons. The polarization was observed for first time by the BESIII Collaboration in e + e → J /ψ → ΛΛ̅ . The observed spin polarization and correlations were used for a direct determination the Λ and Λ ̅ decay asymmetries. The result for Λ → p π − , the well known Λ polarimeter process, differs by 17(3)% from the established value of 0.642(13). Finally the prospects of the method for studies of weak decays of hyperons and for CP tests in baryon sector are discussed.
Publisher
EDP Sciences
Subject
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