Nonstandard heavy mesons and baryons: Experimental evidence
By S. Olsen, T. Skwarnicki, D. Zieminska. 2017
608 citations recorded by the source corpus.
Quantum chromodynamics (QCD), the generally accepted theory for strong interactions, describes the interactions between quarks and gluons. The strongly interacting particles that are seen in nature are hadrons, which are composites of quarks and gluons. Since QCD is a strongly coupled theory at distance scales that are characteristic of observable hadrons, there are no rigorous, first-principle methods to derive the spectrum and properties of the hadrons from the QCD Lagrangian, except for lattice QCD simulations that are not yet able to cope with all aspects of complex and short-lived states. Instead, a variety of “QCD inspired” phenomenological models have been proposed. Common features of these models are predictions for the existence of hadrons with substructures that are more complex than the standard quark-antiquark mesons and the three-quark baryons of the original quark model that provides a concise description of most of the low-mass hadrons. Recently, an assortment of candidates for nonstandard multiquark mesons, meson-gluon hybrids, and pentaquark baryons that contain heavy (charm or bottom) quarks has been discovered. Here the experimental evidence for these states is reviewed and some general comparisons of their measured properties with standard quark model expectations and predictions of various models for nonstandard hadrons are made. The conclusion is that the spectroscopy of all but the simplest hadrons is not yet understood.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/1d83f8e3178bd5c2c54c9c5f9aa45048de143e23
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In Nuclear and High Energy Physics
Citations in the corpus
- Amplitude analysis of the B+→D+D−K+ decay (2020, background): “Conventional cc̄ charmonium states can produce resonant structures in a neutral DD system, but it is now known that exotic charmonium-like states, which can decay to both neutral and charged DD combinations, also exist [5–7].”
- Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era (2018, background): “Because the physics of exotic quarkonia-like states have not yet been understood [470], it is difficult to make precise projections for what can be accomplished with the future large data set from the upgraded LHCb detectors.”