  Standard-model fields and their associated electroweak Lagrangian are
equivalently expressed in a shared spin basis. The scalar-vector terms are
written with scalar-operator components acting on quark-doublet elements, and
shown to be parametrization-invariant. Such terms, and the t- and b-quark
Yukawa terms are linked by the identification of the common mass-generating
Higgs operating upon the other fields, after acquiring a vacuum expectation
value $v$. Thus, the customary vector masses are related to the fermions',
fixing the t-quark mass $m_t$ with the relation $m^2_t+m^2_b=v^2/2$ either for
maximal hierarchy, or given the b-quark mass $m_b$, implying $m_t \simeq 173.9$
GeV, for $v=246$ GeV. A sum rule is derived for all quark masses that
generalizes this restriction. An interpretation follows that electroweak bosons
and heavy quarks belong in a multiplet.
