München 2006 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Physik der Hadronen und Kerne

HK 9: Elektromagnetische und Hadronische Sonden

HK 9.6: Vortrag

Montag, 20. März 2006, 18:00–18:15, G

Study of hyperon and kaon production dynamics and their interaction with nucleons at COSY-11 — •Dieter Grzonka — Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany

Results of investigations on the production of Λ and Σ hyperons and kaons in the collisions of nucleons will be presented. These studies aim for the determination of the production dynamics as well as the hadronic YN and KN interaction. Emphasis will be put on recent results of the K⁺K⁻ meson pair and Σ⁺ hyperon production.

Conclusions will be based on the comparison of close-to-threshold excitation functions for the reactions pp→ pΛ K⁺, pp→ pΣ⁰K⁺, pp→ nK⁺Σ⁺, and pp→ ppK⁺K⁻ with predictions assuming the kinematically available phase space to be homogeneously populated. The data indicate that the Σ⁰ hyperon interacts with a proton much weaker than the Λ or the Σ⁺. The excitation functions for the above mentioned reactions have been determined using the COSY-11 detection system, which permits to study the creation of mesons and hyperons very close to the kinematical threshold: down to a fraction of MeV in the excess energy.

Supported by FZ-Jülich, DAAD, and EU (FP6 HadronPhysics).