Is it a true tetraquark and if so how does that fit with quantum chromodynamics?
http://www.nature.com/news/quark-quartet-opens-fresh-vista-on-matter-1.13225
Is it a true tetraquark and if so how does that fit with quantum chromodynamics?
http://www.nature.com/news/quark-quartet-opens-fresh-vista-on-matter-1.13225