Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Hadronenstruktur und -spektroskopie II

HK 5.5: Vortrag

Montag, 15. März 2010, 17:30–17:45, HG IV

Reconstruction of the Λ (1405)-Resonance with the HADES-Spectrometer — •Johannes Siebenson, Laura Fabbietti, Eliane Epple, and Alexander Schmah — TU Muenchen

The Λ (1405)-resonance is known for several years, but its inner structure is still a topic of investigation. A coupled channel approach can be used to describe this resonance as a kind of molecular state, oscillating between a KN- and a Σπ-bound state. From the experimental point of view, the line shape of the Λ(1405) can be reconstructed from its decay into the (Σ π)0 decay channels. This line shape is expected to be sensitive to the production mechanism. Therefore it is interesting to study the production of this resonance exploiting different beams. We have reconstructed the Λ (1405) signal in pp-reactions at 3.5 GeV with the HADES spectrometer at GSI, where 1.2 billion triggered events were collected. We have achieved to disentangle the three different decay channels (Λ (1405) → Σ0π0, Σπ+ and Σ+π) and the resulting line shapes can be compared.
All the steps of the complex reconstruction analysis will be shown and the results will be compared to the predictions of theoretical models. This work has been supported by the Excellence Cluster ’Universe’ and the Helmholtz Gesellaschaft.

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