Ξcc++

{{DISPLAYTITLE:Ξ_cc⁺⁺}}

{{Infobox particle

| name = $\backslash Xi\_\{\backslash rm\{cc\}\}^\{\{++\}\}$

| image =

| caption = Xi double-charm baryon

| num_types =

| classification = Hadron
Baryon

| composition =

| statistics = Fermion

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| mass = 3621.4 MeV

| mean_lifetime = between {{val|5.0|e=-14}} and {{val|1.0|e=-12}}

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}}

The Xi double-charm baryon, denoted as $\backslash Xi\_\{\backslash rm\{cc\}\}^\{\{++\}\}$, is a Xi baryon composed of two charm quarks and one up quark.{{Citation |url=https://press.cern/press-releases/2017/07/lhcb-experiment-charmed-announce-observation-new-particle-two-heavy-quarks|author=Sébastien Gavois (Nextinpact.com)|date=2017-07-10|title=Retour en douceur sur la découverte d'une nouvelle particule, avec deux quarks " charmés "|accessdate=2017-07-10}}

Its discovery by the LHCb Collaboration was announced on 6 July 2017 in Venice, Italy, at the European Physical Society Conference on High Energy Physics. $\backslash Xi\_\{\backslash rm\{cc\}\}^\{\{++\}\}$ is the first baryon discovered with two heavy quarks (charm and/or bottom) and a light quark. Its mass is 3621 MeV, nearly four times that of the proton.(CERN, European Organization for Nuclear Research 2017)

It was identified when it disintegrated into a $\backslash Lambda\_\{\backslash rm\{c\}\}^\{\{+\}\}$ baryon and three lighter mesons, Kaon, Pion and π{{Sup|+}}.