EPJ Web of Conferences 3, 01015 (2010)
https://doi.org/10.1051/epjconf/20100301015

Elusive multiquark spectroscopy

¹ Laboratoire de Physique Subatomique et Cosmologie, IN2P3-CNRS, Université Joseph Fourier, INPG, 53, avenue des Martyrs, 38026 Grenoble, France
² Institut de Physique Nucléaire de Lyon, Université de Lyon, IN2P3-CNRS-UCBL, 4, rue Enrico Fermi, 69622 Villeurbanne, France

^a e-mail: j-m.richard@ipnl.in2p3.fr

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.