2022 Impact factor 2.7
Hadrons and Nuclei
Open Access
Eur. Phys. J. A 24, s1.9-s1.14 (2005)
DOI: 10.1140/epjad/s2005-05-002-2

Large states beyond qq in QCD: From pentaquarks to no quarks

F.E. Close

Department of Theoretical Physics, University of Oxford, Keble Rd., Oxford, OX1 3NP, United Kingdom

(Received 15 September 2004 / Published online 08 February 2005)


This talk summarises evidence for states beyond those expected in the simple constituent quark model. I focus on the scalar glueball and its mixing with states in the $q\bar{q}$ nonet, and also on correlations in Strong QCD that may form diquarks and seed $qq\bar{q}\bar{q}$ states. Some models of the pentaquark candidate Θ(1540) are critically discussed.

© Società Italiana di Fisica, Springer-Verlag 2005