Casimir scaling, glueballs and hybrid gluelumps

Details Casimir scaling, glueballs and hybrid gluelumps Casimir scaling, glueballs and hybrid gluelumps

2005-11-17

arxiv.org/abs/hep-ph/0511210v1

Eur.Phys.J. A27 (2006) 225-230

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 figures

Scientific paper

10.1140/epja/i2005-10251-7

Assuming that the Casimir scaling hypothesis is well verified in QCD, masses of glueballs and hybrid gluelumps (gluon with a point-like $c\bar c$ pair) are computed within the rotating string formalism. In our model, two gluons are attached by an adjoint string in a glueball while the gluon and the colour octet $c\bar c$ pair are attached by two fundamental strings in a hybrid gluelump. Masses for such exotic hadrons are computed with very few free parameters. These predictions can serve as a guide for experimental searches. In particular, the ground state glueballs lie on a Regge trajectory and the lightest $2^{++}$ state has a mass compatible with some experimental candidates.

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