Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 11: Poster Session: Electromagnetic and Hadronic Probes

HK 11.8: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Extraction of the hyperon-nucleon scattering lengths from production reactions — •Achot Gasparyan^1,2, Johann Haidenbauer¹, Christoph Hanhart¹, and Joseph Speth¹ — ¹IKP-Th, Forschungszentrum Jülich, 52428 Jülich — ²Institute for Theoretical and Experimental Physics, Moscow, Russia

A model independent analysis of the hyperon-nucleon final state interaction in large momentum transfer reactions like pp→ K⁺pΛ or γ d→ K⁺nΛ is performed in the framework of the dispersion relations technic. The relation between the spin singlet and spin triplet YN scattering lengths and the corresponding spin dependent production cross sections is obtained. It is shown that the two possible spin states in the produced YN system can be disentangled by means of polarization experiments. The feasibility of the method is tested through the analysis of the SATURN data on pp→ K⁺p Y differential cross section. The theoretical and experimental uncertainties of the extracted scattering lengths are estimated.