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

INSPIRE search

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

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.

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

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

$2518.41 \pm0.22$ MeV (S = 1.3)

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

$2517.4 {}^{+0.7}_{-0.5}$ MeV

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

$2518.48 \pm0.21$ MeV (S = 1.2)

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

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

$231.95 \pm0.18$ MeV (S = 1.8)

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

$230.9 {}^{+0.7}_{-0.5}$ MeV