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  (beta) 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