Triangle singularities in $B^{-}\to D^{\ast 0}{\pi }^{-}{\pi }^0\eta$ and $B^{-}\to D^{\ast 0}{\pi }^{-}{\pi }^{+}{\pi }^{-}$

R. Pavao, S. Sakai, E. Oset

The possible role of the triangle mechanism in the $B^{-}$ decay into $D^{\ast 0}{\pi }^{-}{\pi }^0\eta$ and $D^{\ast 0}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ is investigated. In this process, the triangle singularity appears from th…