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Using 980 ${\rm fb}^{-1}$ of data {collected} with the Belle detectoroperating at the KEKB asymmetric-energy $e^+e^-$ collider, we report themeasurements of the masses, and the first measurements of the instrinsicwidths, of the $\Sigma_c(2455)^+$ and $\Sigma_c(2520)^+$ charmed baryons. Wefind $M(\Sigma_c(2455)^+)-M(\Lambda_c^+) = 166.17\pm 0.05^{+0.16}_{-0.07}\ {\rmMeV}/c^2$, $\Gamma(\Sigma_c(2455)^+) = 2.3 \pm 0.3 \pm 0.3\ {\rm MeV/c^2}$,$M(\Sigma_c(2520)^+)-M(\Lambda_c^+) = 230.9 \pm 0.5 ^{+0.5}_{-0.1}\ {\rmMeV}/c^2$, and $\Gamma(\Sigma_c(2520)^+) = 17.2^{+2.3\ +3.1}_{-2.1\ -0.7}\ {\rmMeV}/c^2$, where the uncertainties are statistical and systematic,respectively. These measurements can be used to test models of the underlyingquark structure of the $\Sigma_c$ states.

Measurement of the Masses and Widths of the $\Sigma_c(2455)^+$ and $\Sigma_c(2520)^+$ Baryons