Why are technicolour Goldstone bosons massless if they acquire mass?

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trelek2
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I'm having trouble with the following:

technicolour predicts new massless techniquarks.

The technicolour force breaks the chiral symmetries of these quarks and goldstone bosons emerge. But goldstone bosons are massless? Goldstone bosons are eaten by W and Z and thus W and Z acquire mass.

This would make sense to me if the emerging Goldstone bosons were not massless... Could anyone clarify?
 

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Technicolor theories are models of physics beyond the standard model that address electroweak symmetry breaking, the mechanism through which elementary particles acquire masses. Early technicolor theories were modeled on quantum chromodynamics (QCD), the "color" theory of the strong nuclear force, which inspired their name.

Instead of introducing elementary Higgs bosons to explain observed phenomena, technicolor models hide electroweak symmetry and generate masses for the W and Z bosons through the dynamics of new gauge interactions.

http://en.wikipedia.org/wiki/Technicolor_(physics )
 
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Do you know a textbook where idea of technicolors explain step by step? All reviews what I have seen start from a advance detail, and no one explain group representation, Lagrangian and so on. Which equation they use for determine a mass