Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 46: Theory VII

HK 46.8: Talk

Thursday, March 11, 2004, 18:45–19:00, D

The Decay of the Σ⁰–Hyperon in a Covariant Faddeev Approach — •Markus Kloker, Reinhard Alkofer, and Hugo Reinhardt — Institute of Theoretical Physics, Tübingen University

The relativistic three–quark problem is treated by modeling dressed quark propagators and two–quark scalar and axialvector correlations [1,2]. The resulting reduced Poincaré invariant Faddeev equations are solved for octet and decuplet baryons. The radiative decay of the Σ⁰ → Λ γ is calculated. The off-shell behaviour of the corresponding amplitude is investigated and combined with a description of associated strangeness production in this Faddeev approach [3]. Off-shell radiative transitions are considered as isospin violating final state interactions in the near-threshold Λ and Σ production studied experimentally at COSY. [1] M. Oettel and R. Alkofer, Eur. Phys. J. A 16 (2003) 95. [2] M. Oettel, PhD thesis, arXiv:nucl-th/0012067. [3] S. Ahlig et al., Phys. Rev. D 64 (2001) 014004. Supported by COSY under contract no. 41445395.