Direct measurement of chromo-electric flux-tube profiles in lattice QCD with physical quark masses indicates string breaking occurs at a quark-antiquark separation between 0.963 and 1.156 fm.
Flux tubes and coherence length in the SU(3) vacuum
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abstract
An estimate of the London penetration and coherence lengths in the vacuum of the SU(3) pure gauge theory is given downstream an analysis of the transverse profile of the chromoelectric flux tubes. Within ordinary superconductivity, a simple variational model for the magnitude of the normalized order parameter of an isolated vortex produces an analytic expression for magnetic field and supercurrent density. In the picture of SU(3) vacuum as dual superconductor, this expression provides us with the function that fits the chromoelectric field data. The smearing procedure is used in order to reduce noise.
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Hints for string breaking in QCD
Direct measurement of chromo-electric flux-tube profiles in lattice QCD with physical quark masses indicates string breaking occurs at a quark-antiquark separation between 0.963 and 1.156 fm.