The vertex corrections due to the triangle singularity mechanism in the light axial vector meson couplings to $K^{\ast }\bar{K}+c.c.$

Mengchuan Du, Yin Cheng, Qiang Zhao

The light axial vector mesons can couple to $K^{\ast }\bar{K}+c.c.$ in an $S$ wave at the tree level. Due to the near-threshold $S$-wave interactions the couplings can be affected by the…