Measurements of the masses and widths of theΣc(2455)0/++andΣc(2520)0/++baryons

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Abstract

We present measurements of the masses and decay widths of the baryonic states ${\mathrm{\ensuremath{\Sigma}}}_{c}(2455{)}^{0/++}$ and ${\mathrm{\ensuremath{\Sigma}}}_{c}(2520{)}^{0/++}$ using a data sample corresponding to an integrated luminosity of $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric-energy collider operating at the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance. We report the mass differences with respect to the ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ baryon $M({\mathrm{\ensuremath{\Sigma}}}_{c}(2455{)}^{0})\ensuremath{-}M({\mathrm{\ensuremath{\Lambda}}}_{c}^{+})=167.29\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.02\text{ }\text{ }\mathrm{MeV}/{c}^{2},\phantom{\rule{0ex}{0ex}}M({\mathrm{\ensuremath{\Sigma}}}_{c}(2455{)}^{++})\ensuremath{-}M({\mathrm{\ensuremath{\Lambda}}}_{c}^{+})=167.51\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.02\text{ }\text{ }\mathrm{MeV}/{c}^{2},\phantom{\rule{0ex}{0ex}}M({\mathrm{\ensuremath{\Sigma}}}_{c}(2520{)}^{0})\ensuremath{-}M({\mathrm{\ensuremath{\Lambda}}}_{c}^{+})=231.98\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.04\text{ }\text{ }\mathrm{MeV}/{c}^{2},\phantom{\rule{0ex}{0ex}}M({\mathrm{\ensuremath{\Sigma}}}_{c}(2520{)}^{++})\ensuremath{-}M({\mathrm{\ensuremath{\Lambda}}}_{c}^{+})=231.99\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.02\text{ }\text{ }\mathrm{MeV}/{c}^{2},$and the decay widths $\mathrm{\ensuremath{\Gamma}}({\mathrm{\ensuremath{\Sigma}}}_{c}(2455{)}^{0})=1.76\ifmmode\pm\else\textpm\fi{}0.0{4}_{\ensuremath{-}0.21}^{+0.09}\text{ }\text{ }\mathrm{MeV}/{c}^{2},\phantom{\rule{0ex}{0ex}}\mathrm{\ensuremath{\Gamma}}({\mathrm{\ensuremath{\Sigma}}}_{c}(2455{)}^{++})=1.84\ifmmode\pm\else\textpm\fi{}0.0{4}_{\ensuremath{-}0.20}^{+0.07}\text{ }\text{ }\mathrm{MeV}/{c}^{2},\phantom{\rule{0ex}{0ex}}\mathrm{\ensuremath{\Gamma}}({\mathrm{\ensuremath{\Sigma}}}_{c}(2520{)}^{0})=15.41\ifmmode\pm\else\textpm\fi{}0.4{1}_{\ensuremath{-}0.32}^{+0.20}\text{ }\text{ }\mathrm{MeV}/{c}^{2},\phantom{\rule{0ex}{0ex}}\mathrm{\ensuremath{\Gamma}}({\mathrm{\ensuremath{\Sigma}}}_{c}(2520{)}^{++})=14.77\ifmmode\pm\else\textpm\fi{}0.2{5}_{\ensuremath{-}0.30}^{+0.18}\text{ }\text{ }\mathrm{MeV}/{c}^{2},$where the first uncertainties are statistical and the second are systematic. The isospin mass splittings are measured to be $M({\mathrm{\ensuremath{\Sigma}}}_{c}(2455{)}^{++})\ensuremath{-}M({\mathrm{\ensuremath{\Sigma}}}_{c}(2455{)}^{0})=0.22\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.01\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and $M({\mathrm{\ensuremath{\Sigma}}}_{c}(2520{)}^{++})\ensuremath{-}\phantom{\rule{0ex}{0ex}}M({\mathrm{\ensuremath{\Sigma}}}_{c}(2520{)}^{0})=0.01\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.03\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. These results are the most precise to date.

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