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Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Elektromagnetische und Hadronische Sonden

HK 35.6: Talk

Thursday, March 13, 2008, 18:00–18:15, 1C

Investigations on the Λ(1405) with WASA-at-COSY — •Wojciech Weglorz for the WASA-at-COSY collaboration — Institut für Kernphysik, Forschungszentrum Jülich — Nuclear Physics Department, University of Silesia, Katowice

The nature of hyperon resonance Λ(1405) is yet not well known. It is, for example, considered to be of non-triplet quark structure or a bound KN state. Recent calculations predict the Λ(1405) to have a two-pole structure, which has direct influence on the coupling of its πΣ decay modes with the pure Λ(1405) decaying through π0Σ0. One major difficulty in the experimental determination of the spectral shape of the Λ(1405) (width = 50 MeV) originates in its overlap with the Σ(1385) resonance (width = 36 MeV) while having the same charged πΣ decay channels.

The WASA-at-COSY setup with a close to 4π geometrical acceptance for charged and neutral particles allows to detect all final state particles of the decay Λ(1405)→π0Σ0→ (γ γ)π0 (p π γ)Σ0. In combination with the high density hydrogen pellet target and the COSY proton beam this provides the opportiunity to cleanly identify the Λ(1405) in the reaction pppK+Λ(1405) and to shed some light on its nature.

In this presentation the status of the feasibility studies are discussed.

Supported by FZ Jülich and BMBF.

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