A theoretical determination of the eta-eta' mixing
arXiv:0901.2860 · doi:10.1088/1126-6708/2009/05/043
Abstract
The systematic large N_c limit within chiral perturbation provides an optimal eta-eta' mixing angle of about -27 degrees at leading order in p^2. In this frame, agreement with the data can be reached with higher order corrections of about 20%.
12 pages, 2 figures; reference to the two-mixing-angle scheme added, minor corrections; to appear in JHEP