Z(4430) is a mesonic resonance discovered by the Belle experiment.[1][2] It has a mass of 4430 MeV/c2. This resonance 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 ccdu,[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 confirmed exotic hadron candidate resonances, although it is the first to be confirmed with such high statistical significance.[4][5]


  1. ^ Choi, S.-K.; et al. ( 
  2. ^ "Belle Discovers a New Type of Meson" (Press release).  
  3. ^ a b LHCb collaboration (2014). "Observation of the resonant character of the Z(4430)− state". arXiv:1404.1903v1.
  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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