Hybrid Mesons

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.

60 pages, 32 figures, to be appear in Progress in Particle and Nuclear Physics. v2: additional discussion and references. arXiv admin note: text overlap with arXiv:1004.5516

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• The "forbidden" decays of hybrid mesons to $\pi \rho$ can be large
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• 50 Years of Quantum Chromodynamics
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• Partial wave analysis of $J/\psi \to \gamma \eta {\eta }^{\prime }$
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• The Central Drift Chamber for GlueX
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• Open charm-bottom axial-vector tetraquarks and their properties
• Baryon modes in string breaking from gauge/string duality
• Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
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• Hyperfine splittings of heavy quarkonium hybrids
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• New analysis of $\eta \pi$ tensor resonances measured at the COMPASS experiment
• Meson-Hybrid Mixing in $J^{PC}=1^{++}$ Heavy Quarkonium from QCD Sum-Rules
• Light-quarkonium spectra and orbital-angular-momentum decomposition in a Bethe-Salpeter-equation approach
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• Analysis of the possible $D{\bar{D}}_{s0}^{\ast }(2317)$ and $D^{\ast }{\bar{D}}_{s1}^{\ast }(2460)$ molecules with QCD sum rules
• Masses of Open-Flavour Heavy-Light Hybrids from QCD Sum-Rules
• Predictions of the hybrid mesons with exotic quantum numbers $J^{PC}=2^{+-}$
• Search for exotic states in photoproduction at GlueX
• Light double-gluon hybrid states with the exotic quantum numbers $J^{PC}=1^{-+}$ and $3^{-+}$
• Faddeev fixed center approximation to $\pi \bar{K}{K}^{\ast }$ system and the ${\pi }_1(1600)$
• Computing an orthonormal basis of symmetric or antisymmetric hyperspherical harmonics
• Applications of Diagrammatic Renormalization Methods in QCD Sum-Rules
• On coupled-channel dynamics in the presence of anomalous thresholds
• Revealing the inner structure of the newly observed ${\eta }_1(1855)$ via photoproduction
• Heavy-Quark Hybrid Mass Splittings: Hyperfine and "Ultrafine"
• Upper Limit on the Photoproduction Cross Section of the Spin-Exotic ${\pi }_1(1600)$
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