Z(4430)

Short description: Mesonic resonance discovered by the Belle experiment

Z(4430)Classification| Exotic meson

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Composition| Charm quarkCharm antiquarkDown quarkUp antiquark

Z(4430) is a mesonic resonance discovered by the Belle experiment.[1][2] It has a mass of 4430 MeV/c2. The resonant nature of the peak has been confirmed by the LHCb experiment with a significance of at least 13.9 σ.[3] The particle is charged and is thought to have a quark content of Charm quarkCharm antiquarkDown quarkUp antiquark,[3] making it a tetraquark candidate. It has the spin-parity quantum numbers JP = 1+.

The particle joins the X(3872), Zc(3900) and Y(4140) as exotic hadron candidates observed by multiple experiments, although it is the first to be confirmed as a resonance.[4][5]

## See also

* XYZ particle

## References

1. ↑ Choi, S.-K. et al. (2008). "Observation of a resonance-like structure in the π±Ψ′ mass distribution in exclusive B→Kπ±Ψ′ decays". Physical Review Letters 100 (14): 142001. doi:10.1103/PhysRevLett.100.142001. PMID 18518023. Bibcode: 2008PhRvL.100n2001C.π±Ψ′+mass+distribution+in+exclusive+B→Kπ±Ψ′+decays&rft.jtitle=Physical+Review+Letters&rft.aulast=Choi&rft.aufirst=S.-K.&rft.au=Choi, S.-K.&rft.au=Belle+Collaboration&rft.date=2008&rft.volume=100&rft.issue=14&rft.pages=142001&rft_id=info:doi/10.1103/PhysRevLett.100.142001&rft_id=info:pmid/18518023&rft_id=info:bibcode/2008PhRvL.100n2001C&rfr_id=info:sid/en.wikibooks.org:Physics:Z(4430)">
2. ↑ "Belle Discovers a New Type of Meson" (Press release). KEK. 2007. Archived from the original on 2009-01-22. Retrieved 2009-06-20.
3. ↑ 3.0 3.1 LHCb collaboration (2014). "Observation of the resonant character of the Z(4430)− state". Physical Review Letters 112 (22): 222002. doi:10.1103/PhysRevLett.112.222002. PMID 24949760. Bibcode: 2014PhRvL.112v2002A.
4. ↑ Cian O'Luanaigh (9 April 2014). "LHCb confirms existence of exotic hadrons". CERN. http://home.web.cern.ch/about/updates/2014/04/lhcb-confirms-existence-exotic-hadrons.
5. ↑ "Unambiguous observation of an exotic particle which cannot be classified within the traditional quark model". European Organization for Nuclear Research. 9 April 2014. http://lhcb-public.web.cern.ch/lhcb-public/Welcome.html#Z(4430).

## External links

* Major harvest of four-leaf clover

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