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We study the decays into six quarks of off-shell pairs of W bosons producedin electron-positron annihilations, through the O(as^2) order in the strongcoupling constant. We give explicit helicity amplitude formulae. We presentnumerical results in the context of phenomenological analyses of relevance atLEP2 and future Linear Colliders: such as MW determinations, New Physics andHiggs searches.Comment: 33 pages, latex, 12 figure

Six-quark decays of off-shell $W^+W^-$ pairs via parton-level QCD in electron-positron annihilations