Editing List of particles (section)

==== Mesons ====
[[File:Noneto mesônico de spin 0.png|thumb|Mesons of spin 0 form a nonet.]]
{{main|List of mesons}}

Ordinary [[meson]]s are made up of a [[valence quark]] and a valence [[antiquark]]. Because mesons have integer [[Spin (physics)|spin]] (0 or 1) and are not themselves elementary particles, they are classified as "composite" [[bosons]], although being made of [[elementary particles|elementary]] [[fermions]]. Examples of mesons include the [[pion]], [[kaon]], and the [[J/ψ]]. In [[quantum hadrodynamics]], mesons mediate the [[residual strong force]] between nucleons.

At one time or another, positive [[signature]]s have been reported for all of the following [[exotic meson]]s but their existences have yet to be confirmed.
* A [[tetraquark]] consists of two valence quarks and two valence antiquarks;
* A [[glueball]] is a bound state of gluons with no valence quarks;
* [[Hybrid (particle physics)|Hybrid]] mesons consist of one or more valence quark–antiquark pairs and one or more real gluons.