Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2003-06-10
Nucl.Phys. B671 (2003) 103-132
Physics
High Energy Physics
High Energy Physics - Lattice
35 pages, 12 figures. 1 reference added
Scientific paper
An uncontroversial observation of adjoint string breaking is proposed, while measuring the static potential from Wilson loops only. The overlap of the Wilson loop with the broken-string state is small, but non-vanishing, so that the broken-string groundstate can be seen if the Wilson loop is long enough. We demonstrate this in the context of the (2+1)d SU(2) adjoint static potential, using an improved version of the Luscher-Weisz exponential variance reduction. To complete the picture we perform the more usual multichannel analysis with two basis states, the unbroken-string state and the broken-string state (two so-called gluelumps). As by-products, we obtain the temperature-dependent static potential measured from Polyakov loop correlations, and the fundamental SU(2) static potential with improved accuracy. Comparing the latter with the adjoint potential, we see clear deviations from Casimir scaling.
Forcrand Philippe de
Kratochvila Slavo
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