Ξ cc -Baryon
Ξ cc ++ -Baryon |
|
---|---|
classification | |
Fermion Hadron Baryon |
|
properties | |
electric charge | 2 e (+3.204 · 10 −19 C ) |
Resting energy | 3621.2 ± 0.7 MeV |
Charm | +2 |
average lifespan | (256 ± 27) 10 −15 s |
Quark composition |
ucc |
Ξ cc + -Baryon |
|
---|---|
classification | |
Fermion Hadron Baryon |
|
properties | |
electric charge | 1 e (+1.602 10 −19 C ) |
Resting energy | ? MeV |
Charm | +2 |
Quark composition |
dcc |
The Ξ cc (also Xi sub cc ) is a particle that belongs to the baryons . It consists of two charm quarks and an up or a down quark . Depending on the composition of the quark, it is either a (ucc) or a (dcc). So far only that has been proven.
discovery
The extremely short-lived particle with about four times the proton mass was detected in the Large Hadron Collider (LHC) in 2017 . It was generated by proton collisions and the decay into Λ c + + K - + π + + π + was observed .
Ξ cc is the first baryon to be discovered with two heavy quarks (charm or bottom) and one light quark. Clearly speaking, the system is similar to celestial bodies in a binary star system with a planet, with the two charm quarks corresponding to the stars and the light up quark corresponding to a planet.
See also
Individual evidence
- ↑ M. Tanabashi et al .: 2019 Review of Particle Physics. In: Phys. Rev. D 98, 030001 (2018) and 2019 update. Particle Data Group, accessed June 2, 2019 .
- ↑ a b CERN researchers discovered a new particle. Retrieved July 9, 2017 .
- ↑ LHCb collaboration: Observation of the doubly charmed baryon LHCb-PAPER-2017-018, July 6, 2017 (English)
- ↑ "Xi cc ++": New particle discovered orf.at, July 6, 2017, accessed July 6, 2017.