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

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

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

$2816.74 {}^{+0.20}_{-0.23}$ MeV

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

$2820.25 {}^{+0.25}_{-0.31}$ MeV

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

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

$-3.51 \pm0.26$ 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

Decay Modes

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

$\Gamma_{1}$

${{\mathit \Xi}_{{c}}^{\,'}}{{\mathit \pi}}$

seen

188

$\Gamma_{2}$

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

seen

102