Abstract
Measurements on the mass of the η-meson performed at different experimental facilities over the last decade have resulted in very precise results but differ by up to 0.5 MeV/c2 i e, more than eight standard deviations. In order to clarify this situation a new high precision measurement of the dp → 3Heη reaction was conducted at the COoler SYnchrotron – COSY – of the Forschungszentrum Jülich using the ANKE magnetic spectrometer, with the aim to achieve a mass resolution of Δm < 50 keV/c2. In order to measure the η meson mass with high accuracy through the dp → 3Heη reaction, both the momentum of the circulating deuteron beam in COSY as well as of the emitted 3He nucleus has to be determined with high precision. The experimentally achieved resolution for the momenta of the 3He nuclei and the beam deuterons will allow to reach the envisaged η-meson mass resolution.
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