GlueX Physics Review Papers

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 Ω_b^-=bss, and the Ξ_b^-=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, hybrids, multiquarks Experimental facts versus QCD inspired concepts, Eberhard Klempt and Alexander Zaitsev, Phys. Rep. 454 (2007)1–202, arXiv