The Experimental Status of Glueballs

Details The Experimental Status of Glueballs The Experimental Status of Glueballs

2008-12-03

arxiv.org/abs/0812.0600v3

Prog.Part.Nucl.Phys.63:74-116,2009

Physics

High Energy Physics

High Energy Physics - Experiment

62 pages, 26 figures

Scientific paper

10.1016/j.ppnp.2009.03.001

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/c**2; 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 J(PC) = 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.

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