Editing Meson (section)

== Exotic mesons ==
{{main|Exotic meson}}
There is experimental evidence for particles that are [[hadron]]s (i.e., are composed of quarks) and are color-neutral with zero baryon number, and thus by conventional definition are mesons. Yet, these particles do not consist of a single quark/antiquark pair, as all the other conventional mesons discussed above do. A tentative category for these particles is [[exotic meson]]s.

There are at least five exotic meson resonances that have been experimentally confirmed to exist by two or more independent experiments. The most statistically significant of these is the [[Z(4430)]], discovered by the [[Belle experiment]] in 2007 and confirmed by [[LHCb]] in 2014. It is a candidate for being a [[tetraquark]]: a particle composed of two quarks and two antiquarks.<ref name=LHCbZ4430TQuark>LHCb collaborators (2014): [https://arxiv.org/abs/1404.1903 Observation of the resonant character of the Z(4430)− state]</ref> See the main article above for other particle resonances that are candidates for being exotic mesons.