Λb polarization in Z0 decays at LEP

2000 
Abstract The longitudinal polarization of the Λ b baryon is measured at the LEP e + e − collider by DELPHI. It is determined from the charged lepton and neutrino energy spectra in 249±19 Λ b semileptonic decays reconstructed in ≈3.5 million hadronic Z 0 decays using Λ 0 -lepton correlations. The measured polarization is: P Λ b =−0.49 −0.30 +0.32 (stat.)±0.17(syst.)
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