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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

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

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.

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

${{\mathit \Xi}_{{c}}{(2815)}^{+}}$ MASS   $2816.51 \pm0.25$ MeV (S = 1.2)

${{\mathit \Xi}_{{c}}{(2815)}^{0}}$ MASS   $2819.79 \pm0.30$ MeV (S = 1.1)

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

${\mathit m}_{{{\mathit \Xi}_{{c}}{(2815)}^{+}}}–{\mathit m}_{{{\mathit \Xi}_{{c}}^{+}}}$   $348.80 \pm0.10$ MeV

${\mathit m}_{{{\mathit \Xi}_{{c}}{(2815)}^{0}}}–{\mathit m}_{{{\mathit \Xi}_{{c}}^{0}}}$   $349.35 \pm0.11$ MeV

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

${\mathit m}_{{{\mathit \Xi}_{{c}}{(2815)}^{+}}}–{\mathit m}_{{{\mathit \Xi}_{{c}}{(2815)}^{0}}}$   $-3.27 \pm0.27$ MeV

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

${{\mathit \Xi}_{{c}}{(2815)}^{+}}$ WIDTH   $2.43 \pm0.26$ MeV

${{\mathit \Xi}_{{c}}{(2815)}^{0}}$ 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 ${{\mathit \Xi}_{{c}}{(2645)}}{{\mathit \pi}}$ .
Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c) $\Gamma_{1}$ ${{\mathit \Xi}_{{c}}^{\,'}}{{\mathit \pi}}$   seen 188   $\Gamma_{2}$ ${{\mathit \Xi}_{{c}}{(2645)}}{{\mathit \pi}}$   seen 102   $\Gamma_{3}$ ${{\mathit \Xi}_{{c}}^{0}}{{\mathit \gamma}}$   seen 325   $\Gamma_{4}$ ${{\mathit \Xi}_{{c}}^{+}}{{\mathit \gamma}}$   327
FOOTNOTES