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. ${\displaystyle \Xi _{cc}^{++}}$ ${\displaystyle \Xi _{cc}^{+}}$ ${\displaystyle \Xi _{cc}^{++}}$

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 . ${\displaystyle \Xi _{cc}^{++}}$

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

• List of baryons

Individual evidence

1. ↑ 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 . 
2. ↑ ^{a b} CERN researchers discovered a new particle. Retrieved July 9, 2017 . 
3. ↑ LHCb collaboration: Observation of the doubly charmed baryon ${\displaystyle \Xi _{cc}^{++}}$ LHCb-PAPER-2017-018, July 6, 2017 (English)
4. ↑ "Xi cc ++": New particle discovered orf.at, July 6, 2017, accessed July 6, 2017.