DOUBLY CHARMED BARYONS
($\mathit C$ = $+2$)
${{\mathit \Xi}_{{{cc}}}^{++}}$ = ${{\mathit u}}{{\mathit c}}{{\mathit c}}$, ${{\mathit \Xi}_{{{cc}}}^{+}}$ = ${{\mathit d}}{{\mathit c}}{{\mathit c}}$, ${{\mathit \Omega}_{{{cc}}}^{+}}$ = ${{\mathit s}}{{\mathit c}}{{\mathit c}}$ 		INSPIRE   JSON PDGID:
S065

${{\mathit \Xi}_{{{cc}}}^{+}}$

$I(J^P)$ = $?(?^{?})$ 
Nominally the isospin partner of the ${{\mathit \Xi}_{{{cc}}}^{++}}$ ($\mathit ccu$). While the SELEX experiment (MATTSON 2002, OCHERASHVILI 2005) claimed an observation of this state, subsequent searches by BABAR (AUBERT,B 2006D), Belle (CHISTOV 2006, KATO 2014), and LHCb (AAIJ 2013CD, AAIJ 2020AX) did not find any significant signal or evidence for the ${{\mathit \Xi}_{{{cc}}}^{+}}$. However, AAIJ 2021AE reports that its search for ${{\mathit \Xi}_{{{cc}}}^{+}}$ $\rightarrow$ ${{\mathit \Xi}_{{{c}}}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$, when combined with a prior search for ${{\mathit \Xi}_{{{cc}}}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit K}^{-}}$ ${{\mathit \pi}^{+}}$ decays in AAIJ 2020AX, yields a signal at 2.9 $\sigma $ global significance (4.0 $\sigma $ local).
${{\mathit \Xi}_{{{cc}}}^{+}}$ MASS   $3518.9 \pm0.9$ MeV 
 
${{\mathit \Xi}_{{{cc}}}^{+}}$ MEAN LIFE
$\Gamma_{1}$ ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}$   not seen 867
 
$\Gamma_{2}$ ${{\mathit \Xi}_{{{c}}}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$   not seen 861
 
$\Gamma_{3}$ ${{\mathit p}}{{\mathit D}^{+}}{{\mathit K}^{-}}$   604
 
FOOTNOTES