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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Hadronenstruktur und -spektroskopie

HK 30.5: Vortrag

Mittwoch, 21. März 2012, 17:45–18:00, RW 1

Search for the ⁴He−η bound state with WASA-at-COSY — •Wojciech Krzemien¹, Pawel Moskal^1,2, Jerzy Smyrski¹, and Magdalena Skurzok¹ — ¹Jagiellonian University, Krakow, Poland — ²Institut für Kernphysik, and Jülich Center for Hadron Physics, Forschungszentrum

We conduct a search for the ⁴He−η bound state with WASA-at-COSY facility, via a measurement of the excitation functions for the dd → ³He p π reaction, where the outgoing p−π pairs originate from the conversion of the η meson on a nucleon inside the He nucleus.

In June, 2008 first measurements of the excitation functions for the dd → ³Hepπ reaction were performed. In the experiment we used a slowly ramped COSY deutron beam, scanning the range of momenta corresponding to the variation of the excess energy for the ⁴He−η system from - 51 MeV to 22 MeV.The results from the analysis will be presented.

This work has been supported by FFE funds of Forschungszetrum Juelich, grant No 41831803 (COSY-107), by the European Commission under the 7th Framework Programme through the ’Research Infrastructures’ action of the ’Capacities’ Programme. Call: FP7-INFRASTRUCTURES-2008-1, Grant Agreement N. 227431 and by the Polish Ministry of Science and Higher Education under grants No. 2367/B/H03/2009/37 and 0320/B/H03/2011/40.