Today on Nature's website appeared a news about the discovery of a quark quartet (formed from two quarks and two antiquarks). They say that this particle containing four quarks is confirmed. This is the link to the news Quark Quartet
Also, they state that the quarks arrangement in this new particle could have implication for quantum chromodynamics. This is where I get stuck. What implications does a quark quartet have on QCD?
The article references:
- Liu, Z. Q. et al. Phys. Rev. Lett. 110, 252002 (2013).
- Ablikim, M. et al. Phys. Rev. Lett. 110, 252001 (2013).
for the discovery/confirmation as well as some older papers
- Chen, K.-F. et al. Phys. Rev. Lett. 100, 112001 (2008).