Abstract
A review of the theoretical and experimental status of hybrid hadrons is
presented. The states \$\pi\_1(1400)\$, \$\pi\_1(1600)\$, and \$\pi\_1(2015)\$ are
thoroughly reviewed, along with experimental results from GAMS, VES, Obelix,
COMPASS, KEK, CLEO, Crystal Barrel, CLAS, and BNL. Theoretical lattice results
on the gluelump spectrum, adiabatic potentials, heavy and light hybrids, and
transition matrix elements are discussed. These are compared with bag, string,
flux tube, and constituent gluon models. Strong and electromagnetic decay
models are described and compared to lattice gauge theory results. We conclude
that while good evidence for the existence of a light isovector exotic meson
exists, its confirmation as a hybrid meson awaits discovery of its
iso-partners. We also conclude that lattice gauge theory rules out a number of
hybrid models and provides a reference to judge the success of others.
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