Abstract
The spin transfer to the Λ-hyperon from a longitudinally polarized positron beam has been measured at the HERMES experiment in the semi-inclusive reaction e → + p ( d ) → e ′ + Λ → + X in deep inelastic scattering regime with negative four-momentum transfer squared of the exchanged virtual photon Q 2 > 1 GeV 2 . The data were accumulated in the years 1996-2000 using the 27.5 GeV polarized HERA positron beam and an unpolarized internal gas target in a storage cell. The longitudinal spin transfer coefficient D L L ′ Λ is found to be 0.11 ± 0.10( stat ) ± 0.03( syst ) at the average fractional Λ energy 〈 z 〉 = 0.45 .
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