Eta and Eta' physics

Abstract

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 $\eta \to 3\pi$ 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.

10 pages, {Plenary talk given at MENU07, September 10-14, 2007 Jülich, Germany

References in corpus (5)

• $\eta \to 3\pi$ at Two Loops In Chiral Perturbation Theory
• Highly Excited Mesons, Linear Regge Trajectories and the Pattern of the Chiral Symmetry Realization
• Measurement of the Slope Parameter for the eta->3pi0 Decay in the pp->pp eta Reaction
• Quark Mass dependence at Two Loops for Meson Properties
• QCD symmetries in excited hadrons