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There are "no-go" theorems who forbid interaction through soft helicity 3 and higher massless particles and soft interaction between massless fermions with spin more than $\frac{3}{2}$. But if fermions aqquire masses, than such theorem doesn't hold. In many realistic theories fermions aqquire masses through Higgs-like mechanism. So does some "no-go" theorem exist for case of presense of goldstone bosons in theory?

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  • $\begingroup$ Comment to the question (v2): Consider adding references to make the question more accessible to the reader and focus the answers. $\endgroup$ – Qmechanic Jun 16 '15 at 19:39

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