Abstract
Three (or four) straightforward experiments would contribute greatly to completing the spectroscopy of baryons and light mesons. In the baryon sector, data are needed on inelastic reactions from a polarised target withπ±andK±beams up to∼3 GeV/c. Similar data are needed in the light meson sector forp¯pinteractions in the momentum range 0.3–2 GeV/c. In both cases, valuable information is to be obtained from longitudinal (L) and sideways (S) target polarisations as well as the conventional normal (N) polarisation. Thirdly,3S1and3D1mesons in the mass range 1–2.4 GeV could probably be separated either by diffractive dissociation of transversely polarised photons or bye+e−radiative return experiments using transversely and longitudinally polarised electrons.
Highlights
This is a discussion document aiming at stimulating discussion of a fresh round of high-quality experiments on baryon and meson spectroscopy
Understanding confinement is a key issue in particle physics, but it is being neglected
Confinement is clearly a phase transition, but it is quite possible that it exhibits similar subtlety to chemistry and solid state physics
Summary
This is a discussion document aiming at stimulating discussion of a fresh round of high-quality experiments on baryon and meson spectroscopy. In the mass range 1910–2400 MeV, data from LEAR provide a complete spectrum of I 0, C 1 states, summarised in the final coupled-channel analysis of 13. Glozman 19 proposes in a series of papers that chiral symmetry is approximately restored high in the spectrum This would require J P C 4− mesons at masses close to the well known 4 states f4 2040 and a4 2040. He arrives at a different scheme where states fall more naturally into hydrogen-like representations of the dynamical O4 group This difference from Glozman immediately illustrates the fact that better and more complete data are required to settle even the general features of how QCD works. With this extra information, the spectroscopy of charmed states would become clearer, at least one could ask different questions
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