Noun
quark-antiquark (plural quark-antiquarks)
A particle-antiparticle pair in hadrons and mesons.
At a large enough distance, it becomes energetically more favorable to pull a quark-antiquark pair out of the vacuum rather than increase the length of the flux tube. Source: Internet
Mesons main Mesons are hadrons composed of a quark-antiquark pair. Source: Internet
One can hypothesise baryons with further quark-antiquark pairs in addition to their three quarks. Source: Internet
These gluons also hold the quark-antiquark combination called the pion together, and thus help transmit a residual part of the strong force even between colorless hadrons. Source: Internet
Yet, these particles do not consist of a single quark-antiquark pair, as all the other conventional mesons discussed above do. Source: Internet