Ξcc++

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

Classification	Hadron Baryon
Statistics	Fermion
Mass	3621.4 MeV/c2
Mean lifetime	between 5.0×10−14 and 1.0×10−12

The Xi double-charm baryon, denoted as $\Xi _{\rm {cc}}^{++}$, 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. $\Xi _{\rm {cc}}^{++}$ 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 $\Lambda _{\rm {c}}^{+}$ 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 $\Xi _{\rm {cc}}^{++}$" (PDF). Retrieved 2017-07-08.
• "Une nouvelle particule pointe son nez au Cern" (in French). 7 July 2017. Retrieved 2017-07-08.