Light quark mass differences in the ${\pi }^0-\eta -{\eta }^{\prime }$ system

A. A. Osipov, B. Hiller, A. H. Blin +1

A generalized 3 flavor Nambu-Jona--Lasinio Lagrangian including the explicit chiral symmetry breaking interactions which contribute at the same order in the large $1/N_c$ counting…