Abstract.
We introduce a novel approach to the hybrid-meson (valence-gluon+quark+antiquark) bound-state problem in relativistic quantum field theory. Exploiting the existence of strong two-body correlations in the gluon-quark, \(q_{g} = [gq]\), and gluon-antiquark, \( \bar{q}_{g} = [g\bar{q}]\) channels, we argue that a sound description of hybrids can be obtained by solving a coupled pair of effectively two-body equations; and, consequently, that hybrids may be viewed as highly correlated \( q_{g} \bar{q} \leftrightarrow q \bar{q}_{g}\) bound states. Analogies may be drawn between this picture of hybrid structure and that of baryons, in which diquark (quark+quark) correlations play a key role. The potential of this formulation is illustrated by calculating the spectrum of light-quark isovector hybrid mesons.
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Xu, SS., Cui, ZF., Chang, L. et al. New perspective on hybrid mesons. Eur. Phys. J. A 55, 113 (2019). https://doi.org/10.1140/epja/i2019-12805-4
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DOI: https://doi.org/10.1140/epja/i2019-12805-4