Abstract
In recent years, the η meson has been a focal point of research for the WASA experiment at the Cooler Synchrotron COSY of the Research Center Jülich. Production experiments using nucleon-nucleon and nucleon-nucleus collisions have been performed, studying the η − N interaction in various configurations. A better understanding of this interaction is a key aspect in the ongoing search for η-nuclear bound states. In addition, the η meson itself represents an ideal laboratory for precision studies of the strong and electromagnetic interactions as well as for searches for beyond Standard Model physics. Large datasets were assembled using the WASA experiment to enable studies on rare and forbidden decay modes. An overview over recent highlights of the WASA η meson physics programme was given.
Highlights
The η meson has been an integral part of the WASA-at-COSY hadron physics programme over the last decade
Making use of two large, dedicated datasets for decay studies of 30 × 106 η mesons in pd → 3Heη and 500 × 106 η mesons in pp → ppη, respectively, the search for rare and forbidden η decays is an integral part of the WASA-atCOSY η physics programme
An overview was given over some selected topics within the η meson physics programme with the WASA-at-COSY experiment
Summary
The η meson has been an integral part of the WASA-at-COSY hadron physics programme over the last decade. Hadronic decays can give access to isospin violation and the difference in the up- and down-quark masses, whereas radiative decays can be used to study quantum anomalies Another major part in the studies of rare and forbidden decays are leptonic and semi-leptonic decays. These give access to the form factor of the η meson, can be used to study symmetry violations and to search for beyond Standard Model physics. Making use of two large, dedicated datasets for decay studies of 30 × 106 η mesons in pd → 3Heη and 500 × 106 η mesons in pp → ppη, respectively, the search for rare and forbidden η decays is an integral part of the WASA-atCOSY η physics programme
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