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

${{\mathit \Xi}_{{{c}}}{(2645)}}$ $I(J^P)$ = $1/2(3/2^{+})$

The natural assignment is that this is the $\mathit J{}^{P} = 3/2{}^{+}$ excitation of the ${{\mathit \Xi}_{{{c}}}}$ in the same SU(4) multiplet as the ${{\mathit \Delta}{(1232)}}$, but the quantum numbers have not been measured.

${{\mathit \Xi}_{{{c}}}{(2645)}}$ MASSES

${{\mathit \Xi}_{{{c}}}{(2645)}^{+}}$ MASS

$2645.17 \pm0.27$ MeV (S = 1.1)

${{\mathit \Xi}_{{{c}}}{(2645)}^{0}}$ MASS

$2646.24 \pm0.18$ MeV (S = 1.1)

${{\mathit \Xi}_{{{c}}}{(2645)}}–{{\mathit \Xi}_{{{c}}}}$ MASS DIFFERENCES

${\mathit m}_{{{\mathit \Xi}_{{{c}}}{(2645)}^{+}}}–{\mathit m}_{{{\mathit \Xi}_{{{c}}}^{0}}}$

$174.67 \pm0.09$ MeV

${\mathit m}_{{{\mathit \Xi}_{{{c}}}{(2645)}^{0}}}–{\mathit m}_{{{\mathit \Xi}_{{{c}}}^{+}}}$

$178.45 \pm0.10$ MeV

${{\mathit \Xi}_{{{c}}}{(2645)}^{+}}–{{\mathit \Xi}_{{{c}}}{(2645)}^{0}}$ MASS DIFFERENCE

$-1.06 \pm0.27$ MeV (S = 1.1)