CERN announced that it first discovered the new baryon "Ξcc ++" with two charm quarks

CERN is a new substance containing two charm quarks "Ξcc ++"We announced at the EPS conference that they discovered. It is an example that was discovered for the first time "existence of two heavy quarks with baryons" which existence was predicted so far.

Observation of the doubly charmed baryon Xicc ++ - lhcb_paper_2017.07.06.pdf
(PDF file)http://press.web.cern.ch/sites/press.web.cern.ch/files/file/press/2017/07/lhcb_paper_2017.07.06.pdf

LHCb announces a charming new particle | CERN
https://home.cern/about/updates/2017/07/lhcb-announces-charming-new-particle

BaryonConsists of three quarksHadronFor example, protons and neutrons are representative baryons. There are six different types of quarks, so in theory there are possibilities that new baryons may be formed by various combinations.

Quark,Up Quark(U),Down quark(D),Strange Quark(S) "light quark"Charm Quark(C),Bottom Quark(B),Top Quark(T) "heavy quark" can be classified. Baryons discovered so far have at best only one heavy quark.

On the other hand, "Ξcc ++" (Gusai CC double plus) discovered in the collision experiment with CERN's large hasron collision type accelerator (LHCb) has two upright quarks, the third heaviest quark, Because it has one, it is the unprecedented substance of the first "baryon consisting of two heavy quarks".

According to CERN, the mass of Ξcc ++ is about 3621 MeV / cc and it has about 4 times the weight of proton, the most famous baryon.


LHCb spokesperson Giovanni Pasheva said, "Finding a baryon with two heavy quarks,Quantum color mechanicsIt will be one of the powerful analytical tools at the time, "he says that it will help to improve the predictive performance of the theory. Also, former LHC b spokesperson Guy Weierkinson said, "While other baryons are like three quarks going around each other and doing" precise dance ", whereas like Ξcc ++ Baryons with two heavy quarks are expected to make a movement like a planetary system, "he says that it might be a new model in which light quarks orbit around heavy quarks.