We present measurements of the masses and decay widths of the baryonic states ${\mathrm{\Sigma }}_c(2455{)}^{0/++}$ and ${\mathrm{\Sigma }}_c(2520{)}^{0/++}$ using a data sample corresponding to an integrated luminosity of $711{\mathrm{fb}}^{-1}$ collected with the Belle detector at the KEKB $e^{+}{e}^{-}$ asymmetric-energy collider operating at the $\mathrm{\Upsilon }(4S)$ resonance. We report the mass differences with respect to the ${\mathrm{\Lambda }}_c^{+}$ baryon $$\begin{gathered} M({\mathrm{\Sigma }}_c(2455{)}^0)-M({\mathrm{\Lambda }}_c^{+})=167.29\pm 0.01\pm 0.02\mathrm{MeV}/c^2, \\ M({\mathrm{\Sigma }}_c(2455{)}^{++})-M({\mathrm{\Lambda }}_c^{+})=167.51\pm 0.01\pm 0.02\mathrm{MeV}/c^2, \\ M({\mathrm{\Sigma }}_c(2520{)}^0)-M({\mathrm{\Lambda }}_c^{+})=231.98\pm 0.11\pm 0.04\mathrm{MeV}/c^2, \\ M({\mathrm{\Sigma }}_c(2520{)}^{++})-M({\mathrm{\Lambda }}_c^{+})=231.99\pm 0.10\pm 0.02\mathrm{MeV}/c^2, \end{gathered}$$and the decay widths $$\begin{gathered} \mathrm{\Gamma }({\mathrm{\Sigma }}_c(2455{)}^0)=1.76\pm 0.04_{-0.21}^{+0.09}\mathrm{MeV}/c^2, \\ \mathrm{\Gamma }({\mathrm{\Sigma }}_c(2455{)}^{++})=1.84\pm 0.04_{-0.20}^{+0.07}\mathrm{MeV}/c^2, \\ \mathrm{\Gamma }({\mathrm{\Sigma }}_c(2520{)}^0)=15.41\pm 0.41_{-0.32}^{+0.20}\mathrm{MeV}/c^2, \\ \mathrm{\Gamma }({\mathrm{\Sigma }}_c(2520{)}^{++})=14.77\pm 0.25_{-0.30}^{+0.18}\mathrm{MeV}/c^2, \end{gathered}$$where the first uncertainties are statistical and the second are systematic. The isospin mass splittings are measured to be $M({\mathrm{\Sigma }}_c(2455{)}^{++})-M({\mathrm{\Sigma }}_c(2455{)}^0)=0.22\pm 0.01\pm 0.01\mathrm{MeV}/c^2$ and $M({\mathrm{\Sigma }}_c(2520{)}^{++})-M({\mathrm{\Sigma }}_c(2520{)}^0)=0.01\pm 0.15\pm 0.03\mathrm{MeV}/c^2$. These results are the most precise to date.

• Received 23 April 2014

DOI:https://doi.org/10.1103/PhysRevD.89.091102