On cusps in the ${\eta }^{\prime }$ potential

Ryuichiro Kitano, Ryutaro Matsudo, Lukas Treuer

The large $N$ analysis of QCD states that the potential for the ${\eta }^{\prime }$ meson develops cusps at ${\eta }^{\prime }=\pi /N_f$, $3\pi /N_f$, $\cdots$, with $N_f$ the number of flavors. Furthermore, the…