Eta and Eta' physics

Details Eta and Eta' physics Eta and Eta' physics

2007-10-22

arxiv.org/abs/0710.4017v1

ECONFC070910:104,2007

Physics

Nuclear Physics

Nuclear Theory

10 pages, {Plenary talk given at MENU07, September 10-14, 2007 J\"ulich, Germany

Scientific paper

This talk describes the reasons why $\eta$ and $\eta^\prime$ decays are an interesting topic of study for both theory and experiment. The main part discusses the results of the recent calculation of $\eta\to3\pi$ at two-loop order in ChPT. Some puzzling aspects of the results compared to earlier dispersive calculations are highlighted. I also like to remind the reader of the use of $\eta$ and $\eta^\prime$ decays for studying the anomaly.

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