Colour confinement and dual superconductivity of the vacuum - I
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We study dual superconductivity of the ground state of SU(2) gauge theory, in connection with confinement. We do that measuring on the lattice a disorder parameter describing condensation of monopoles. Confinement appears as a transition to dual superconductor, independent of the abelian projection defining monopoles. Some speculations are made on the existence of a more appropriate disorder parameter. A similar study for SU(3) is presented in a companion paper.
Some typos corrected, acknowledgements added; to appear on Phys. Rev. D
Some typos corrected, acknowledgements added; to appear on Phys. Rev. D