CHARMED BARYONS
($\boldsymbol C$ = $+1$)
${{\mathit \Lambda}_{{c}}^{+}}$ = ${{\mathit u}}{{\mathit d}}{{\mathit c}}$ , ${{\mathit \Sigma}_{{c}}^{++}}$ = ${{\mathit u}}{{\mathit u}}{{\mathit c}}$ , ${{\mathit \Sigma}_{{c}}^{+}}$ = ${{\mathit u}}{{\mathit d}}{{\mathit c}}$ , ${{\mathit \Sigma}_{{c}}^{0}}$ = ${{\mathit d}}{{\mathit d}}{{\mathit c}}$ ,
${{\mathit \Xi}_{{c}}^{+}}$ = ${{\mathit u}}{{\mathit s}}{{\mathit c}}$ , ${{\mathit \Xi}_{{c}}^{0}}$ = ${{\mathit d}}{{\mathit s}}{{\mathit c}}$ , ${{\mathit \Omega}_{{c}}^{0}}$ = ${{\mathit s}}{{\mathit s}}{{\mathit c}}$

INSPIRE search

${{\boldsymbol \Sigma}_{{c}}{(2520)}}$ $I(J^P)$ = $1(3/2^{+})$

Seen in the ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \pi}^{\pm}}$ mass spectrum. The natural assignment is that this is the $\mathit J{}^{P} = 3/2{}^{+}$ excitation of the ${{\mathit \Sigma}_{{c}}{(2455)}}$, the charm counterpart of the ${{\mathit \Sigma}{(1385)}}$, but neither $\mathit J$ nor ${}^{P}$ has been measured.

${{\boldsymbol \Sigma}_{{c}}{(2520)}}$ MASSES

${{\mathit \Sigma}_{{c}}{(2520)}^{++}}$ MASS

$2518.41 {}^{+0.21}_{-0.19}$ MeV (S = 1.1)

${{\mathit \Sigma}_{{c}}{(2520)}^{+}}$ MASS

$2517.5 \pm2.3$ MeV

${{\mathit \Sigma}_{{c}}{(2520)}^{0}}$ MASS

$2518.48 \pm0.20$ MeV (S = 1.1)

${{\boldsymbol \Sigma}_{{c}}{(2520)}}$ MASS DIFFERENCES

${\mathit m}_{{{\mathit \Sigma}_{{c}}{(2520)}^{++}}}–{\mathit m}_{{{\mathit \Lambda}_{{c}}^{+}}}$

$231.95 {}^{+0.17}_{-0.12}$ MeV (S = 1.3)

${\mathit m}_{{{\mathit \Sigma}_{{c}}{(2520)}^{+}}}–{\mathit m}_{{{\mathit \Lambda}_{{c}}^{+}}}$

$231.0 \pm2.3$ MeV