Broken scale invariance, massless dilaton and confinement in QCD

Details Broken scale invariance, massless dilaton and confinement in QCD Broken scale invariance, massless dilaton and confinement in QCD

2008-09-22

arxiv.org/abs/0809.3794v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 2 figures; v2: fixed numerous typos

Scientific paper

Classical conformal invariance of QCD in the chiral limit is broken explicitly by scale anomaly. As a result, the lightest scalar particle (scalar glueball, or dilaton) in QCD is not light, and cannot be described as a Goldstone boson. Nevertheless basing on an effective low-energy theory of broken scale invariance we argue that inside the hadrons the non-perturbative interactions of gluon fields result in the emergence of a massless dilaton excitation (which we call the "scalaron"). We demonstrate that our effective theory of broken scale invariance leads to confinement. This theory allows a dual formulation as a classical Yang-Mills theory on a curved conformal space-time background. Possible applications are discussed, including the description of strongly coupled quark-gluon plasma and the spin structure of hadrons.

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