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A mesonic molecule is a set of two or more mesons bound together by the strong force.[1][2] Unlike baryonic molecules, which form the nuclei of all elements in nature save hydrogen-1, a mesonic molecule has yet to be definitively observed.[3] The X(3872) discovered in 2003 and the Z(4430) discovered in 2007 by the Belle experiment are the best candidates for such an observation.
See also

Meson
Tetraquark
Pionium

References

Trutnev, Yuri A. (1998). In The Intermissions: Collected Works On Research Into The Essentials Of Theoretical Physics In R. World Scientific. p. 106. ISBN 978-981-4495-65-3. Retrieved 23 June 2020.
Hughes, Vernon (2012). Muon Physics V3: Chemistry and Solids. Elsevier. p. 189. ISBN 978-0-323-15616-5. Retrieved 23 June 2020.

Jungmann, Klaus; Hughes, Vernon W.; Putlitz, Gisbert zu (2012). The Future of Muon Physics: Proceedings of the International Symposium on The Future of Muon Physics, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Federal Republic of Germany, 7–9 May, 1991. Springer Science & Business Media. ISBN 978-3-642-77960-2.

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Particles in physics
Elementary
Fermions
Quarks

Up (quark antiquark) Down (quark antiquark) Charm (quark antiquark) Strange (quark antiquark) Top (quark antiquark) Bottom (quark antiquark)

Leptons

Electron Positron Muon Antimuon Tau Antitau Electron neutrino Electron antineutrino Muon neutrino Muon antineutrino Tau neutrino Tau antineutrino

Bosons
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Scalar

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Hypothetical
Superpartners
Gauginos

Gluino Gravitino Photino

Others

Axino Chargino Higgsino Neutralino Sfermion (Stop squark)

Others

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Composite
Hadrons
Baryons

Nucleon
Proton Antiproton Neutron Antineutron Delta baryon Lambda baryon Sigma baryon Xi baryon Omega baryon

Mesons

Pion Rho meson Eta and eta prime mesons Phi meson J/psi meson Omega meson Upsilon meson Kaon B meson D meson Quarkonium

Exotic hadrons

Tetraquark Pentaquark

Others

Atomic nuclei Atoms Exotic atoms
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Hypothetical
Baryons

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Mesons

Glueball Theta meson T meson

Others

Mesonic molecule Pomeron Diquark R-hadron

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Related

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timeline Standard Model
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Quark model Exotic matter Massless particle Relativistic particle Virtual particle Wave–particle duality Particle chauvinism

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