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

${{\mathit \Xi}_{{{c}}}{(2815)}}$ $I(J^P)$ = $1/2(3/2^{-})$

Seen in both ${{\mathit \Xi}_{{{c}}}^{\,'}}{{\mathit \pi}}$ and ${{\mathit \Xi}_{{{c}}}}{{\mathit \pi}}{{\mathit \pi}}$ decays. The simplest assignment is that this belongs to the same SU(4) multiplet as the ${{\mathit \Lambda}{(1520)}}$ and the ${{\mathit \Lambda}_{{{c}}}{(2625)}}$, but the spin and parity have not been measured.

${{\mathit \Xi}_{{{c}}}{(2815)}}$ MASSES

${{\mathit \Xi}_{{{c}}}{(2815)}^{+}}$ MASS

$2816.60 \pm0.16$ MeV

${{\mathit \Xi}_{{{c}}}{(2815)}^{0}}$ MASS

$2819.85 \pm0.27$ MeV (S = 1.1)

${{\mathit \Xi}_{{{c}}}{(2815)}}–{{\mathit \Xi}_{{{c}}}}$ MASS DIFFERENCES

${\mathit m}_{{{\mathit \Xi}_{{{c}}}{(2815)}^{+}}}–{\mathit m}_{{{\mathit \Xi}_{{{c}}}^{+}}}$

$348.81 \pm0.09$ MeV

${\mathit m}_{{{\mathit \Xi}_{{{c}}}{(2815)}^{0}}}–{\mathit m}_{{{\mathit \Xi}_{{{c}}}^{0}}}$

$349.35 \pm0.11$ MeV

${{\mathit \Xi}_{{{c}}}{(2815)}^{+}}–{{\mathit \Xi}_{{{c}}}{(2815)}^{0}}$ MASS DIFFERENCE

${\mathit m}_{{{\mathit \Xi}_{{{c}}}{(2815)}^{+}}}–{\mathit m}_{{{\mathit \Xi}_{{{c}}}{(2815)}^{0}}}$

$-3.26 \pm0.27$ MeV

${{\mathit \Xi}_{{{c}}}{(2815)}}$ WIDTHS

${{\mathit \Xi}_{{{c}}}{(2815)}^{+}}$ WIDTH

$2.15 \pm0.15$ MeV (S = 1.2)

${{\mathit \Xi}_{{{c}}}{(2815)}^{0}}$ WIDTH

$2.54 \pm0.25$ MeV

${{\boldsymbol \Xi}_{{{c}}}{(2815)}}$ DECAY MODES

The ${{\mathit \Xi}_{{{c}}}}{{\mathit \pi}}{{\mathit \pi}}$ modes are consistent with being entirely via ${{\mathit \Xi}_{{{c}}}{(2645)}}{{\mathit \pi}}$.