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Spectrum of the open QCD flux tube in d=2+1 and its effective string description
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abstract
Simulations in lattice gauge theory suggest that the formation of a flux tube between quark and antiquark leads to quark confinement. It is conjectured that the infrared behaviour of the flux tube is governed by an effective string theory and simulations show good agreement between lattice data and its predictions. To next-to leading order ($R^{-3}$) in the inverse $q\bar{q}$ separation $R$ the effective string theory is equivalent to Nambu-Goto string theory. For the open flux tube in three dimensions corrections appear at order $R^{-4}$. We compare these predictions to high-accuracy measurements of the groundstate energy of the flux tube in 3d SU(2) and SU(3) gauge theory and extract the coefficient of the leading order boundary term in the effective action.
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The spectrum of open confining strings in the large-Nc limit
The open flux-tube spectrum in SU(Nc) for Nc=3 to 6 shows massive axion-like states whose lightest mass, extrapolated to large Nc, is consistent with the worldsheet axion mass of the closed flux tube.
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