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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Elektromagnetische und Hadronische Sonden

HK 50.4: Talk

Thursday, March 15, 2007, 17:45–18:00, A

Determination of the pΛ scattering length via p^→p → pK⁺ Λ — •Dieter Grzonka for the COSY-11 collaboration — IKP, Forschungszentrum Jülich, 52425 Jülich, Germany

The close-to-threshold Λ hyperon production via the p^→p → pK⁺ Λ reaction with a polarized proton beam was measured at the COSY-11 installation, an internal experimental facility at the cooler synchrotron COSY.

A 3-body final state is an appropriate tool to study the interactions of the two particle subsystems especially for unstable particles where a direct scattering analysis is difficult like the Λ N system or sometimes even impossible. The Λ N-interaction has already been investigated with unpolarized beams, but experimentally spin singlet and spin triplet interactions were not disentangled.

The determination of the spin singlet and spin triplet components requires the polarization of both, beam and target. However, using a polarized beam alone allows at least to extract the spin triplet scattering length when selecting a certain kinematical region.

The data are presently under analysis and the status of the investigations will be given.