Hybrid Baryon Signatures

We discuss whether a low-lying hybrid baryon should be defined as a three quark - gluon bound state or as three quarks moving on an excited adiabatic potential. We show that the latter definition becomes exact, not only for very heavy quarks, but also for specific dynamics. We review the literature on the signatures of hybrid baryons, with specific reference to strong hadronic decays, electromagnetic couplings, diffractive production and production in psi decay.Comment: Talk at ``The Physics of Excited Nucleons'' (NSTAR2000), Newport News, VA, 16-19 Feb. 2000. 8 pages, LaTe

Multi-GeV Gluonic Mesons

Lattice QCD gives reliable predictions for hybrid charmonium and multi-GeV glueball masses. Proton-antiproton annihilation may offer an excellent opportunity for the first observation of these states. There are two distinct possible programs: The search for J^PC-exotic and non-J^PC-exotic states. The latter program represents substantially higher cross sections and does not absolutely require partial wave analysis, two very attractive features. The program can be performed with a varying pbar energy <10 GeV and a fixed target.Comment: Invited talk given at The pbar2000 Workshop, Chicago, IL, August 3-5, 2000. 10 pages, LaTe

Hadron Structure and Modern Spectroscopy

The colour, flavour, spin and J^PC of glueballs and hybrid mesons and baryons are constructed in an intuitive manner in both the gluon counting and adiabatic definitions. Glueball decay, production and mixing and hybrid meson decay selection rules and production are clarified.Comment: Invited Lectures at the Advanced School on Quantum Chromodynamics 2000 (QCD2000), Benasque, Huesca, Spain, 3 - 6 July 2000. 26 pages, LaTeX, 4 (encapsulated) postscript figure

Strong Decays of Hybrid Mesons from the Heavy Quark Expansion of QCD

We calculate the strong decays of hybrid mesons to conventional mesons for all the lowest lying J^PC hybrids of flavour uu, dd, ss, cc and bb. A decay operator developed from the heavy quark expansion of quantum chromodynamics is employed. We show that the selection rule that hybrid mesons do not decay to identical S-wave mesons, found in other models, is preserved. We predict decays of charmonium hybrids, discuss decays of J^PC=1^-+ exotic isovector hybrids of various masses, and interpret the \pi(1800) as a hybrid meson.Comment: 5 pages, LaTeX, 2 eps figures. Contribution to the Seventh International Conference on Hadron Spectroscopy (HADRON '97), Brookhaven, August 1997. In collaboration with Eric S. Swanson and Adam P. Szczepania

Hybrid Baryons

We review the status of hybrid baryons. The only known way to study hybrids rigorously is via excited adiabatic potentials. Hybrids can be modelled by both the bag and flux-tube models. The low-lying hybrid baryon is N 1/2^+ with a mass of 1.5-1.8 GeV. Hybrid baryons can be produced in the glue-rich processes of diffractive gamma N and pi N production, Psi decays and p pbar annihilation.Comment: Invited plenary talk presented at the ``9th International Conference on the Structure of Baryons'' (BARYONS 2002), 3-8 March, Newport News, VA, USA. 12 pages, 7 encapsulated postscript figures, LaTe