Z(4430)

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
c

c

d

u
,[3] making it a tetraquark candidate. It has the spin-parity quantum numbers JP = 1+.

Z(4430)
ClassificationExotic meson
Composition
c

c

d

u

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

References
  1. Choi, S.-K.; Belle Collaboration; et al. (2007). "Observation of a resonance-like structure in the
    π±
    Ψ′ mass distribution in exclusive B→K
    π±
    Ψ′ decays". Physical Review Letters. 100 (14): 142001. arXiv:0708.1790. Bibcode:2008PhRvL.100n2001C. doi:10.1103/PhysRevLett.100.142001. PMID 18518023.
  2. "Belle Discovers a New Type of Meson" (Press release). KEK. 2007. Retrieved 2009-06-20.
  3. LHCb collaboration (2014). "Observation of the resonant character of the Z(4430)− state". Physical Review Letters. 112 (22): 222002. arXiv:1404.1903. Bibcode:2014PhRvL.112v2002A. doi:10.1103/PhysRevLett.112.222002. PMID 24949760.
  4. Cian O'Luanaigh (9 April 2014). "LHCb confirms existence of exotic hadrons". CERN.
  5. "Unambiguous observation of an exotic particle which cannot be classified within the traditional quark model". European Organization for Nuclear Research. 9 April 2014.


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