Observation of new excited ${\Sigma }_c^0$ states in the $B^{-}\to {\Lambda }_c^{+}\bar{p}{\pi }^{-}$ decay

An amplitude analysis of the $B^{-}\to {\Lambda }_c^{+}\bar{p}{\pi }^{-}$ decay is performed using proton-proton collision data, corresponding to an integrated luminosity of $9{\text{ fb}}^{-1}$, collected with the \mbox{LHCb} detector at center-of-mass energies of 7, 8, and 13$\text{ TeV}$. In the ${\Lambda }_c^{+}{\pi }^{-}$ invariant-mass spectrum, the known ${\Sigma }_c(2455{)}^0$, ${\Sigma }_c(2520{)}^0$, ${\Sigma }_c(2800{)}^0$ baryons are observed, along with two new states: ${\Sigma }_c(2900{)}^0$ and ${\Sigma }_c(3200{)}^0$. The masses and widths of the three high-mass states, modeled with Breit–Wigner line shapes, are determined. This result expands the landscape of charm baryon spectroscopy and provides crucial data for understanding charm baryon structure and dynamics.