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Mesonic molecule

A mesonic molecule is a set of two or more mesons bound together by the strong force. Unlike baryonic molecules, which form the nuclei of all elements in nature save hydrogen, a mesonic molecule has yet to be definitively observed. The X(3872) discovered in 2003 and the Z(4430) discovered in 2007 by the Belle Collaboration are the best candidates for such an observation.

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v • d • e Particles in physics
Elementary particles	Fermions: Quarks: u · d · s · c · b · t • Leptons: e^- · e⁺ · μ^- · μ⁺ · τ^- · τ⁺ · ν_e · ν_μ · ν_τ Bosons: Gauge bosons: γ · g · W^± · Z⁰ Other: Ghosts
Composite particles	Hadrons: Baryons(list)/Hyperons/Nucleons: p · n · Δ · Λ · Σ · Ξ · Ω · Ξ_b • Mesons(list)/Quarkonia: π · K · ρ · J/ψ · Υ Other: Atomic nuclei • Atoms • Exotic atoms: Positronium • Molecules
Hypothetical elementary particles	Superpartners: Axino · Dilatino · Chargino · Gluino · Gravitino · Higgsino · Neutralino · Sfermion · Slepton · Squark Other: Axion · Dilaton · Goldstone boson · Graviton · Higgs boson · Tachyon · X · Y · W' · Z'
	Exotic hadrons: Exotic baryons: Pentaquark • Exotic mesons: Glueball · Tetraquark Other: Mesonic molecule
Quasiparticles	Davydov soliton · Exciton · Magnon · Phonon · Plasmon · Polariton · Polaron