Mesonic molecule

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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.

[edit] See also

Meson

v • d • e Particles in physics

Elementary particles	Fermions: Quarks: u · d · c · s · t · b • Leptons: e⁻ · e⁺ · μ⁻ · μ⁺ · τ⁻ · τ⁺ · νe · νμ · ντ · νe · νμ · ντ Bosons: Gauge bosons: γ · g · W^± · Z Other: Ghosts

Composite particles	Hadrons: Baryons/Hyperons/Nucleons: p⁺ · n⁰ · Δ · Λ · Σ · Ξ · Ω • Mesons/Quarkonia: π · K · ρ · J/ψ · Υ Other: Atomic nuclei • Atoms • Exotic atoms: Positronium · Muonium • Molecules

Hypothetical elementary particles	Superpartners: Axino · Chargino · Gaugino · Gluino · Gravitino · Higgsino · Neutralino · Sfermion Other: Axion · Dilaton · Graviton · Higgs boson · Tachyon · X · Y · W′ · Z′ · Sterile neutrino

Hypothetical composite particles	Exotic hadrons: Exotic baryons: Dibaryon · Pentaquark • Exotic mesons: Glueball · Tetraquark Other: Mesonic molecule

Quasiparticles	Davydov soliton · Exciton · Magnon · Phonon · Plasmon · Polariton · Polaron

Lists	List of particles · List of baryons · List of mesons · Timeline of particle discoveries