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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Elektromagnetische und Hadronische Sonden

HK 3.2: Vortrag

Montag, 12. März 2007, 18:15–18:30, A

Study of Λ polarisation at HERMES — •Martin Raithel for the HERMES collaboration — Physikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

Longitudinal and transverse Λ polarisation have been measured at the HERMES experiment.The data were accumulated in the years 1996-2000 using the 27.5 GeV polarised HERA positron beam and polarised or unpolarised hydrogen and deuterium targets. The longitudinal spin transfer coefficient measured in the semi-inclusive deep inelastic scattering regime is compatible with zero in a wide range of the fractional Λ energy z. The transverse polarisation of Λ hyperons produced inclusively in quasi-real photoproduction is measured to be positive, in contrast to the negative values obtained with high-energy proton beams. This work was supported by BMBF, project Nr. 06 ER 125 I and 06 ER 243.