Search for the η-mesic bound states with the WASA-at-COSY detector

Abstract

The experiments dedicated to the search for η-mesic Helium were performed with high statistics using WASA detection setups installed at the COSY accelerator in the Research Center Juelich. The search for the η-mesic bound states is conducted via the measurement of the excitation function for selected decay channels of the He-η systems using unique ramped beam technique. This report presents recent status of the data analysis.