Asymmetry measurement of the polarized Σ~+p elastic scattering and the hyperon-nucleon spin-orbit interaction

摘要

In order to study the hyperon-nucleon spin-orbit interaction, asymmetries of the polarized Σ~+ elastic scattering on protons have been measured. The polarized hyperons were produced through the p(π~+, K~+)Σ~+ reaction in a liquid-scintillator active target, and tracks of Σ~+p scattering events were recorded with a newly developed track detector named SCITIC (scintillating track image camera). Although analyses of 10 times more data with more sophisticated data-taking systems and more elaborated analyzing tools are under way, data from an early stage of this experiment indicate a large Σ~+p spin-orbit interaction in contrast to the case of the small ΛN spin-orbit interaction.