Editing Eightfold way (physics) (section)

===Baryons===

====Baryon octet====
[[Image:Baryon octet.png|thumb|The {{mvar|J}} = {{sfrac|1|2}} [[baryon]] octet]]
The eightfold way organizes the [[Spin (physics)|spin]]-{{sfrac|1| 2 }} [[baryon]]s into an octet. They consist of
* [[neutron]] (n) and [[proton]] (p) 
* {{SubatomicParticle|sigma-}}, {{SubatomicParticle|sigma0}}, and {{SubatomicParticle|sigma+}} [[sigma baryon]]s
* {{Subatomic particle|Lambda0}}, the [[lambda baryon|strange lambda baryon]]
* {{SubatomicParticle|xi-}} and {{SubatomicParticle|xi0}} [[xi baryon]]s

====Baryon decuplet====
[[Image:Baryon decuplet.png|thumb|The {{mvar|J}} = {{sfrac|3|2}} [[baryon decuplet]]]]
The [[Special unitary group#Lie algebra 3|organizational principles of the eightfold way]] also apply to the spin-{{sfrac|3|2}} baryons, forming a [[Baryon#Isospin and charge|decuplet]].
* {{SubatomicParticle|delta-}}, {{SubatomicParticle|delta0}}, {{SubatomicParticle|delta+}}, and {{SubatomicParticle|delta++}} [[delta baryon]]s
* {{SubatomicParticle|sigma*-}}, {{SubatomicParticle|sigma*0}}, and {{SubatomicParticle|sigma*+}} [[sigma baryon]]s
* {{SubatomicParticle|xi*-}} and {{SubatomicParticle|xi*0}} [[xi baryon]]s
* {{SubatomicParticle|omega-}} [[omega baryon]]

However, one of the particles of this decuplet had never been previously observed when the eightfold way was proposed. Gell-Mann called this particle the {{SubatomicParticle|link=yes|Omega-}} and predicted in 1962 that it would have a [[strangeness]] &minus;3, [[electric charge]] &minus;1 and a mass near {{val|1680|u=MeV/c2}}. In 1964, a particle closely matching these predictions was discovered<ref name=Barnes-Connolly-etal-1964/> by a [[particle accelerator]] group at [[Brookhaven National Laboratory|Brookhaven]]. Gell-Mann received the 1969 [[Nobel Prize in Physics]] for his work on the theory of [[elementary particle]]s.