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 $\hat{I}\pounds (1385{)}^0$, $\hat{I}›(1405)$ and $\hat{I}›\hat{I}›(1520)$ as well as the production of double strange baryon systems $\hat{I}{ž}^{-}$ and $\hat{I}›\hat{I}›$ 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