\Lambda_{b}^{0}\to\Lambda_{c}^{+}\pi^{-}, \Lambda^{+}_{c}\to p\eta, \eta\to\pi^{+}\pi^{-}\pi^{0}
\Lambda_{b}^{0}\to\Lambda_{c}^{+}\pi^{-}
\Lambda^{+}_{c}\to p\eta
\eta\to\pi^{+}\pi^{-}\pi^{0}