The η-η' mixing angle revisited
The value of the �-�' mixing angleP is phenomenologically deduced from a rather exhaustive and up-to-date analysis of data including strong decays of tensor and higher-spin mesons, electromagnetic decays of vector and pseudoscalar mesons, J/ decays into a vector and a pseudoscalar meson, and other transitions. A value ofP between −17 ◦ and −13 ◦ is consistent with the present experimental evidence and the averageP = −15.5 ◦ ± 1.3 ◦ seems to be favoured.