Z(4430)

Z(4430) is a mesonic resonance discovered by the Belle experiment. It has a mass of $4,430 MeV/c2$. The resonant nature of the peak has been confirmed by the LHCb experiment with a significance of at least 13.9 σ. The particle is charged and is thought to have a quark content of Charm quarkCharm antiquarkDown quarkUp antiquark, 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 exotic hadron candidates observed by multiple experiments, although it is the first to be confirmed as a resonance.