Z(4430)

Z(4430)
Classification	Exotic meson
Composition	Charm quarkCharm antiquarkDown quarkUp antiquark

Short description: Mesonic resonance discovered by the Belle experiment

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 J^P = 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]

References

↑ 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.
↑ "Belle Discovers a New Type of Meson" (Press release). KEK. 2007. Archived from the original on 2009-01-22. Retrieved 2009-06-20.
↑ ^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.
↑ 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.
↑ "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

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[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.

[2] "Belle Discovers a New Type of Meson" (Press release). KEK. 2007. Archived from the original on 2009-01-22. Retrieved 2009-06-20.

[LHCb-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).

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Z(4430)

Topic: Physics

See also

References

External links