GlueX Physics Review Papers

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GlueX Physics

Review Papers

  • Recent Review Papers on Hadron Spectroscopy
    • Baryon Spectroscopy, Eberhard Klempt and Jean Marc Richard, (2009) arXiv.
      • About 120 baryons and baryon resonances are known, from the abundant nucleon with u and d light-quark constituents up to the recently discovered Ωb-=bss, and the Ξb-=bsd which contains one quark of each generation. In spite of this impressively large number of states, the underlying mechanisms leading to the excitation spectrum are not yet understood. Heavy-quark baryons suffer from a lack of known spin-parities. In the light-quark sector, quark-model calculations have met with considerable success in explaining the low-mass excitations spectrum but some important aspects like the mass degeneracy of positive-parity and negative-parity baryon excitations are not yet satisfactorily understood. At high masses, above 1.8 GeV, quark models predict a very high density of resonances per mass interval which is not observed. In this review, issues are identified discriminating between different views of the resonance spectrum; prospects are discussed how open questions in baryon spectroscopy may find answers from photo- and electro-production experiments which are presently carried out in various laboratories.
    • The Experimental Status of Glueballs, Volker Crede and Curtis A Meyer, Prog. Part. Nucl. Phys. 63 (2009)74-116 arXiv
      • Glueballs and other resonances with large gluonic components are predicted as bound states by Quantum Chromodynamics (QCD). The lightest (scalar) glueball is estimated to have a mass in the range from 1 to 2 GeV/c2; a pseudoscalar and tensor glueball are expected at higher masses. Many different experiments exploiting a large variety of production mechanisms have presented results in recent years on light mesons with JPC = 0++, 0-+, and 2++ quantum numbers. This review looks at the experimental status of glueballs. Good evidence exists for a scalar glueball which is mixed with nearby mesons, but a full understanding is still missing. Evidence for tensor and pseudoscalar glueballs are weak at best. Theoretical expectations of phenomenological models and QCD on the lattice are briefly discussed.
    • Glueballs, hybrids, multiquarks Experimental facts versus QCD inspired concepts, Eberhard Klempt and Alexander Zaitsev, Phys. Rep. 454 (2007)1–202, arXiv
      • The spectroscopy of light and heavy mesons is reviewed with emphasis on glueballs, hybrids, and tetraquarks.

Exotic Quantum Number Mesons

Lattice QCD Calculations

Photoproduction

Strong Decay Models