Z4430 is a mesonic resonance discovered by the Belle experiment It has a mass of 7003443000000000000♠4430 MeV/c2 The resonant nature of the peak has been confirmed by the LHCb experiment with a significance of at least 139 σ The particle is charged and is thought to have a quark content of
, making it a tetraquark candidate It has the spin-parity quantum numbers JP = 1+
The particle joins the X3872, Zc3900 and Y4140 as exotic hadron candidates observed by multiple experiments, although it is the first to be confirmed as a resonance
Choi, S-K; Belle Collaboration; et al 2007 "Observation of a resonance-like structure in the
Ψ′ mass distribution in exclusive B→K
Ψ′ decays" Physical Review Letters 100 14 arXiv:07081790 Bibcode:2008PhRvL100n2001C doi:101103/PhysRevLett100142001
- ^ "Belle Discovers a New Type of Meson" Press release KEK 2007 Retrieved 2009-06-20
- ^ a b LHCb collaboration 2014 "Observation of the resonant character of the Z4430− state" Physical Review Letters 112 22 arXiv:14041903v1 Bibcode:2014PhRvL112v2002A doi:101103/PhysRevLett112222002
- ^ Cian O'Luanaigh 9 April 2014 "LHCb confirms existence of exotic hadrons" CERN
- ^ "Unambiguous observation of an exotic particle which cannot be classified within the traditional quark model" European Organization for Nuclear Research 9 April 2014
- Major harvest of four-leaf clover
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