The role of triangle singularity in the $B^0\to D^{-}{\pi }^{+}{a}_0(980)({\pi }^0\eta )$ decay

Wei Wang, Dazhuang He, Xuan Luo

The triangle singularity interpretation of the \replyhe{$a_1(1420)$} observed by the COMPASS Collaboration has been widely accepted. In this work, we investigate the triangle mecha…