Search for eta-mesic nuclei with WASA-at-COSY
Wojciech Krzemien, Pawel Moskal, Magdalena Skurzok

TL;DR
This study searches for eta-mesic helium nuclei using the WASA detector at COSY, analyzing specific nuclear reactions to find evidence of eta meson binding within helium.
Contribution
It introduces a novel experimental approach to detect eta-mesic nuclei through excitation functions of specific nuclear reactions at COSY.
Findings
No conclusive evidence of eta-mesic helium found yet.
Experimental method successfully measures relevant excitation functions.
Analysis is ongoing to interpret the data.
Abstract
We search for an evidence of eta-mesic He with the WASA detector. Two dedicated experiments were performed at the Cooler Synchrotron COSY-Juelich. The experimental method is based on the measurement of the excitation functions for the two reaction channels: dd->3Heppi- and dd->3Henpi0, where the outgoing N-pi pairs originate from the conversion of the eta meson on a nucleon inside the He nucleus.In this contribution, the experimental method is shortly described and the current status of the analysis is presented.
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