Chromoelectric flux tubes and coherence length in QCD
  The transverse profile of the chromoelectric flux tubes in SU(2) and SU(3) pure gauge theories is analyzed by a simple variational ansatz using a strict analogy with ordinary superconductivity. Our method allows to extract the penetration length and the coherence length of the flux tube. 
Paolo Cea, Leonardo Cosmai, Alessandro Papa
hep-lat