  We present measurements of the masses and decay widths of the baryonic states
$\Sigma_{c}(2455)^{0/++}$ and $\Sigma_{c}(2520)^{0/++}$ using a data sample
corresponding to an integrated luminosity of 711 fb$^{-1}$ collected with the
Belle detector at the KEKB $e^{+}e^{-}$ asymmetric-energy collider operating at
the $\Upsilon(4S)$ resonance. We report the mass differences with respect to
the $\Lambda_{c}^{+}$ baryon $M(\Sigma_{c}(2455)^{0})-M(\Lambda_{c}^{+}) =
167.29\pm0.01\pm0.02$ MeV/$c^{2}$, $M(\Sigma_{c}(2455)^{++})-M(\Lambda_{c}^{+})
= 167.51\pm0.01\pm0.02$ MeV/$c^{2}$,
$M(\Sigma_{c}(2520)^{0})-M(\Lambda_{c}^{+}) = 231.98\pm0.11\pm0.04$
MeV/$c^{2}$, $M(\Sigma_{c}(2520)^{++})-M(\Lambda_{c}^{+}) =
231.99\pm0.10\pm0.02$ MeV/$c^{2}$, and the decay widths
$\Gamma(\Sigma_{c}(2455)^{0}) = 1.76\pm0.04^{+0.09}_{-0.21}$ MeV/$c^{2}$,
$\Gamma(\Sigma_{c}(2455)^{++}) = 1.84\pm0.04^{+0.07}_{-0.20}$ MeV/$c^{2}$,
$\Gamma(\Sigma_{c}(2520)^{0}) = 15.41\pm0.41^{+0.20}_{-0.32}$ MeV/$c^{2}$,
$\Gamma(\Sigma_{c}(2520)^{++}) = 14.77\pm0.25^{+0.18}_{-0.30}$ MeV/$c^{2}$,
where the first uncertainties are statistical and the second are systematic.
The isospin mass splittings are measured to be
$M(\Sigma_{c}(2455)^{++})-M(\Sigma_{c}(2455)^{0})=0.22\pm0.01\pm0.01$
MeV/$c^{2}$ and
$M(\Sigma_{c}(2520)^{++})-M(\Sigma_{c}(2520)^{0})=0.01\pm0.15\pm0.03$
MeV/$c^{2}$. These results are the most precise to date.
