Author Archive
318. Glueballs and gluelumps as bound states of transverse constituent gluons
Fabien Buisseret is a postdoc at the Nuclear Physics department of the University of Mons-Hainaut. His interests include various approaches to QCD. Dmitry.
1. Generalities
Among other exotic hadrons like hybrid mesons and tetraquarks, QCD allows the existence of purely gluonic bound states, called glueballs, whose structure and properties deserve a lot of interest theoretically. A recent review on glueballs can be found in arXiv:0810.4453. Much effort is also devoted to the experimental detection of a clear glueball signal, but no unambiguous candidate has been found yet (arXiv:0812.0600). An important achievement in the field has been the computation of the glueball spectrum in quenched lattice QCD (hep-lat/9901004, hep-lat/0510074), that is the mass spectrum of pure gauge QCD. Gluelump masses have also been obtained on the lattice (hep-lat/9811010, hep-ph/0310130). These are another hypothetical type of gluonic hadrons, where a spinless, static, color-octet source is added to the gauge field. Gluelumps have actually been a first attempt to model gluino-gluon bound states. A plot of some lattice data concerning glueballs and gluelumps is given in Figure 1, where the masses are expressed in units of the lattice energy scale 
in order to avoid larger error bars due to the determination of 
.
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