2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/198422We 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. DHigh Energy Physics - LatticeHigh Energy Physics - Theorytext