Abstract
Tremendous progress has been made in mapping out the spectrum of hadrons over the past decade with plans to make further advances in the decade ahead. Baryons and mesons, both expected and unexpected, have been found, the results of precision experiments often with polarized beams, polarized targets and sometimes polarization of the final states. All these hadrons generate poles in the complex energy plane that are consequences of strong coupling QCD. They reveal how this works.
Highlights
Tremendous progress has been made in mapping out the spectrum of hadrons over the past decade with plans to make further advances in the decade ahead
The rich spectrum of hadrons reveals the workings of QCD in the strong coupling regime
Even more results are to come from BESIII, COMPASS, LHCb, MAMI, ELSA, and Jefferson Lab experiments, with PANDA to follow
Summary
The spectrum of states of any system is fundamental: reflecting the constituents that make up that system and the interactions between them. The rich spectrum of hadrons reveals the workings of QCD in the strong coupling regime. Knowing the QCD Lagrangian as we do, one can, in principle, compute its consequences. This turns out to be only just within our capabilities, and only in simpler cases can definitive results be obtained. In experiment quarks know how to solve the field equations of QCD in the strong coupling regime even without the help of a BlueGene computer. Extracting the spectrum from complex data is often far from straightforward, requiring close interaction between theory and experiment. Even more results are to come from BESIII, COMPASS, LHCb, MAMI, ELSA, and Jefferson Lab experiments, with PANDA to follow
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