Production and electromagnetic decay of hyperons: a feasibility study with HADES as a Phase-0 experiment at FAIR

Abstract

A feasibility study has been performed in order to investigate the performance of the HADES detector to measure the electromagnetic decays of the hyperon resonances $\Sigma (1385{)}^0$, $\Lambda (1405)$ and $\Lambda \Lambda (1520)$ as well as the production of double strange baryon systems ${\Xi }^{-}$ and $\Lambda \Lambda$ in p+p reactions at a beam kinetic energy of 4.5 GeV. The existing HADES detector will be upgraded by a new Forward Detector, which extends the detector acceptance into a range of polar angles that plays a crucial role for these investigations. The analysis of each channel is preceded by a consideration of the production cross-sections. Afterwards the expected signal count rates using a target consisting of either liquid hydrogen or polyethylene are summarized.

Draft prepared by Rafał Lalik, James Ritman, Piotr Salabura, 19 pages, 21 figures, 4 tables

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• Meson cloud contributions to the Dalitz decays of decuplet to octet baryons
• Medium effects in antikaon-induced ${\Xi }^{-}$ hyperon production on nuclei near threshold
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