Is it possible to produce massive composite particles from a non abelian gauge theory of massless fermions? I know that if the quarks were massless, the pions will be massless too (goldstone bosons). But what about baryons? Will they be also massless? If so, can we make a general statement that composite particles from any non abelian gauge theory of massless fermions will always be massless? Is there some mathematical proof for that?