Measurement of Longitudinal Spin Transfer to Lambda Hyperons in Deep-Inelastic Lepton Scattering

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dc.creatorHERMES Collaboration
dc.creatorAirapetian, A.
dc.date1999-11-13
dc.date2001-06-11
dc.date.accessioned2026-07-07T13:03:51Z
dc.date.available2026-07-07T13:03:51Z
dc.descriptionSpin transfer in deep-inelastic Lambda electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the HERA storage ring. For an average fractional energy transfer <z> = 0.45, the longitudinal spin transfer from the virtual photon to the Lambda has been extracted. The spin transfer along the Lambda momentum direction is found to be 0.11 +/- 0.17 (stat) +/- 0.03 (sys); similar values are found for other possible choices for the longitudinal spin direction of the Lambda. This result is the most precise value obtained to date from deep-inelastic scattering with charged lepton beams, and is sensitive to polarized up quark fragmentation to hyperon states. The experimental result is found to be in general agreement with various models of the Lambda spin content, and is consistent with the assumption of helicity conservation in the fragmentation process.
dc.description8 pages, 3 figures; new version has an expanded discussion and small format changes
dc.identifierhttps://arxiv.org/abs/hep-ex/9911017
dc.identifierhttp://arxiv.org/abs/hep-ex/9911017
dc.identifierPhys.Rev.D64:112005,2001
dc.identifierdoi:10.1103/PhysRevD.64.112005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/226953
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of Longitudinal Spin Transfer to Lambda Hyperons in Deep-Inelastic Lepton Scattering
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