Elusive multiquark spectroscopy

Abstract

A review is presented of past and recent attempts to build multiquark states within current models already describing ordinary mesons and baryons. This includes: coherence in the chromomagnetic interaction, tetraquarks with two heavy quarks, Steiner-tree models of confinement, and hadronic molecules, in particular in the hidden-charm sector. Some emphasis is put on the difficulties encountered when extrapolating toward higher configurations the dynamics of confining forces, starting from the simple case of a quark and an antiquark, or three quarks in a colour singlet.

Cited by in corpus (3)

• The sigma and f_0(980) from Ke4 + pi-pi scatterings data
• The Polyakov loop in various representations in the confined phase of QCD
• Multiquark correlations in light mesons and baryons from holographic QCD