  Wigner's famous 1939 classification of positive energy representations,
combined with the more recent modular localization principle, has led to a
significant conceptual and computational extension of renormalized perturbation
theory to interactions involving fields of higher spin s>1/2. The starting
observation was that the well-known clash between point-localized gauge
theories and the Hilbert space, which hitherto has been solved by using a Krein
space setting, can also be solved by preserving the Hilbert space setting; in
this case the theory selects the tightest covariant localization which is
consistent with the Hilbert space positivity. The resulting semiinfinite
spacelike string-localization for all (m=0,s>1/2) representations does not only
lead to a new insight into the origin of infrared problems (including
confinement), but also improves the short-distance behavior of massive s>1/2
fields to the extend that the power-counting criterion admits candidates for
renormalizable interactions for arbitrary high spins. In this work the new
situation is exemplified for the interaction of massive vectormesons with
scalar charged- and neutral- (Higgs) matter, for which the new "adiabatic
equivalence principle" leads to a local relation between a renormalizable
stringlike and a nonrenormalizable (but nevertheless finite-parametric)
pointlike interaction.
