Gluonic Colour Singlets in QCD

Details Gluonic Colour Singlets in QCD Gluonic Colour Singlets in QCD

2009-08-30

arxiv.org/abs/0908.4416v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, LaTeX svjour.cls Discussion improved, especially concerning the nonconfinement of Abelian gluons. Discussion of inter

Scientific paper

We argue that certain specific gluon excitations, other than conventional glueballs, can propagate freely outside of hadrons and glueballs. We begin with the result that the Abelian generators of $SU(N)$ QCD can be meaningfully isolated by the Cho-Faddeev-Niemi-Shabanov decomposition. It has already been shown by Cho \emph{et. al.} that the corresponding gluon excitations have a gauge transformation whose form indicates that they are physical entities of neutral colour charge. We contend that this colour neutrality permits them to propagate freely, albeit with an effective mass due to interaction with the confining chromomonopole condensate. According to the dual-superconductor model of the QCD vacuum, this mass has an upper bound of $k_B T_c \sqrt{2}$. We conclude with some expected experimental signatures.

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