Z(4430)
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
c
c
d
u
,[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]
References
- ^
Choi, S.-K. (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). arXiv:0708.1790. Bibcode:2008PhRvL.100n2001C. doi:10.1103/PhysRevLett.100.142001.{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ "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 Z(4430)− state". arXiv:1404.1903.
{{cite arXiv}}: Unknown parameter|version=ignored (help) - ^ 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.
External links
 | This particle physics–related article is a stub. You can help Wikipedia by expanding it. |