Tetraquark

A tetraquark state has long been suspected to be allowed by quantum chromodynamics,[1] the modern theory of strong interactions.

A tetraquark state is an example of an exotic hadron that lies outside the conventional quark model classification.

[4] In 2003, a particle temporarily called X(3872), by the Belle experiment in Japan, was proposed to be a tetraquark candidate,[6] as originally theorized.

[13] In 2014, the Large Hadron Collider experiment LHCb confirmed the existence of the Z(4430) state with a significance of over 13.9 σ.

[14][15] In February 2016, the DØ experiment reported evidence of a narrow tetraquark candidate, named X(5568), decaying to B0sπ±.

Up quark Charm quark Top quark Gluon Higgs boson Down quark Strange quark Bottom quark Photon Electron Muon Tau (particle) W and Z bosons#Z bosons}Z boson Electron neutrino Muon neutrino Tau neutrino W and Z bosons Standard Model Fermion Boson Quark Lepton Scalar boson Gauge boson Vector boson
Colour flux tubes produced by four static quark and antiquark charges, computed in lattice QCD . [ 5 ] Confinement in quantum chromodynamics leads to the production of flux tubes connecting colour charges. The flux tubes act as attractive QCD string -like potentials.