The Xi double-charm baryon, denoted as Ξ c c + + {\displaystyle \Xi _{\rm {cc}}^{++}} , is a Xi baryon composed of two charm quarks and one up quark. 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. Ξ c c + + {\displaystyle \Xi _{\rm {cc}}^{++}} is the first baryon discovered with two heavy quarks (charm and/or bottom) and a light quark. Its mass is 3621 MeV/c2, nearly four times that of the proton. It was identified when it disintegrated into a Λ c + {\displaystyle \Lambda _{\rm {c}}^{+}} baryon and three lighter mesons, K–, π+ and π+.
See also
List of baryons
References
Bibliography European Organization for Nuclear Research (CERN). "The LHCb experiment is charmed to announce observation of a new particle with two heavy quarks". Retrieved 2017-07-08. LHCb Collaboration. "Observation of the doubly charmed baryon Ξ c c + + {\displaystyle \Xi _{\rm {cc}}^{++}} " (PDF). Retrieved 2017-07-08. "Une nouvelle particule pointe son nez au Cern" (in French). 7 July 2017. Retrieved 2017-07-08.