X(3872)

The X(3872) is an exotic meson candidate with a mass of 3871.68 MeV/c2[1] which does not fit into the quark model because of its quantum numbers. It was first discovered in 2003 by the Belle experiment[2] in Japan and later confirmed by several other experimental collaborations. Several theories have been proposed for its nature,[3] such as a mesonic molecule or a diquark-antidiquark pair (tetraquark).

The quantum numbers of X(3872) have been determined by the LHCb experiment at CERN in March 2013. The values for JPC are 1++.[4] The first evidence of X(3872) production in the quark–gluon plasma have been reported by the CMS experiment at CERN in January 2022.[5]

## See also

* Meson
* XYZ particle
* Y(4140)
* Z(4430)
* Zc(3900)

## Notes

1. ↑ Particle Data Group Live listings
2. ↑ Choi, S.-K. (2003). "Observation of a Narrow Charmoniumlike State in Exclusive B±→K±π+π-J/ψ Decays". Physical Review Letters 91 (26): 262001. doi:10.1103/PhysRevLett.91.262001. PMID 14754041. Bibcode: 2003PhRvL..91z2001C.
3. ↑ Swanson, E. S. (2006). "The new heavy mesons: A status report". Physics Reports 429 (5): 243–305. doi:10.1016/j.physrep.2006.04.003. Bibcode: 2006PhR...429..243S.
4. ↑ Aaij, R. (2013). "Determination of the X(3872) meson quantum numbers". Physical Review Letters 110 (22): 222001. doi:10.1103/PhysRevLett.110.222001. PMID 23767712. Bibcode: 2013PhRvL.110v2001A.
5. ↑ Sirunyan, A. M. (2022). "Evidence for X(3872) in Pb-Pb Collisions and Studies of its Prompt Production at 5.02 TeV". Physical Review Letters 128 (3): 032001. doi:10.1103/PhysRevLett.128.032001. PMID 35119878.

## References

* David Harris (13 April 2008). "The charming case of X(3872)". Symmetry Magazine. http://www.symmetrymagazine.org/breaking/2008/04/13/the-charming-case-of-x3872/.

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