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. 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 J P C 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
Notes
- ^ Particle Data Group Live listings
- ^ Choi, S.-K.; et al. ( Belle Collaboration) (2003). "Observation of a Narrow Charmoniumlike State in Exclusive B±→K±π+π-J/ψ Decays". Physical Review Letters. 91 (26): 262001. arXiv: hep-ex/0308029. Bibcode: 2003PhRvL..91z2001C. doi: 10.1103/PhysRevLett.91.262001. PMID 14754041. S2CID 1017547.
- ^ Swanson, E. S. (2006). "The new heavy mesons: A status report". Physics Reports. 429 (5): 243–305. arXiv: hep-ph/0601110. Bibcode: 2006PhR...429..243S. doi: 10.1016/j.physrep.2006.04.003. S2CID 54704359.
- ^ Aaij, R.; et al. ( LHCb collaboration) (2013). "Determination of the X(3872) meson quantum numbers". Physical Review Letters. 110 (22): 222001. arXiv: 1302.6269. Bibcode: 2013PhRvL.110v2001A. doi: 10.1103/PhysRevLett.110.222001. PMID 23767712.
- ^ Sirunyan, A. M.; et al. ( CMS collaboration) (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. arXiv: 2102.13048. doi: 10.1103/PhysRevLett.128.032001. PMID 35119878.
References
- David Harris (13 April 2008). "The charming case of X(3872)". Symmetry Magazine. Retrieved 2009-12-17.
 | This particle physics–related article is a stub. You can help Wikipedia by expanding it. |
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. 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 J P C 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
Notes
- ^ Particle Data Group Live listings
- ^ Choi, S.-K.; et al. ( Belle Collaboration) (2003). "Observation of a Narrow Charmoniumlike State in Exclusive B±→K±π+π-J/ψ Decays". Physical Review Letters. 91 (26): 262001. arXiv: hep-ex/0308029. Bibcode: 2003PhRvL..91z2001C. doi: 10.1103/PhysRevLett.91.262001. PMID 14754041. S2CID 1017547.
- ^ Swanson, E. S. (2006). "The new heavy mesons: A status report". Physics Reports. 429 (5): 243–305. arXiv: hep-ph/0601110. Bibcode: 2006PhR...429..243S. doi: 10.1016/j.physrep.2006.04.003. S2CID 54704359.
- ^ Aaij, R.; et al. ( LHCb collaboration) (2013). "Determination of the X(3872) meson quantum numbers". Physical Review Letters. 110 (22): 222001. arXiv: 1302.6269. Bibcode: 2013PhRvL.110v2001A. doi: 10.1103/PhysRevLett.110.222001. PMID 23767712.
- ^ Sirunyan, A. M.; et al. ( CMS collaboration) (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. arXiv: 2102.13048. doi: 10.1103/PhysRevLett.128.032001. PMID 35119878.
References
- David Harris (13 April 2008). "The charming case of X(3872)". Symmetry Magazine. Retrieved 2009-12-17.
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