We examine the invariant mass spectrum of $D^{ 0}p$ in $\bar B^0\to p\bar p D^{ 0}$ decay measured by BABAR and find that through the 2-step processes of $\bar B^0\to { \bf B_c^+}(\to D^{ 0} p)\bar p$, where ${ \bf B_c}$ denotes a charmed baryon state, some of the peaks can be identified with the established $\Sigma_c(2800)^+$, $\Lambda_c(2880)^+$ and $\Lambda_c(2940)^+$. Moreover, in order to account for the measured spectrum, it is necessary to introduce a new charmed baryon resonance with $(m,\,\Gamma)=(3212\pm 20,\,167\pm 34)$ MeV.
Categories: hep-ph hep-ex