Polarization ofΛ0 hyperons inK−p interactions

The polarization of theΛ0 hyperon produced inK−p interactions at 110 GeV/c shows a strong dependence on the transverse momentump t of theΛ0 and no significant dependence onx F . The polarization for largep t is negative in the proton hemisphere and positive in the kaon hemisphere. In theproton hemisphere it is compared with the results of otherK−p experiments at lower energies as well as with reactions induced byp,\(\bar p\), π+, π+ andK+. The comparison is performed separately forK−p→Λ0KK+pions andK−p→Λ0+pions showing an analogous behaviour in the former channel. In thekaon hemisphere the comparison with otherK−p experiments at lower energy shows ap t -dependence of theΛ0 polarization which changes with energy. The experimental results are discussed in terms of current quark models and of the Mueller-Regge phenomenology. The model predictions reproduce the trend of the data qualitatively well but fail in describing some details.