Local Interactions of Higher-Spin Potentials That are Gauge Invariant in Linear Approximation

We study connected Wightman functions of $N$ conserved currents, each of which is formed from a scalar field and has even spin $l_{i}$. The UV divergence of this vertex function is regularized by the analytic continuation in the space dimension $D\longrightarrow D-ε$. We evaluate the residue of $ε^{-1}$ only, which is a local interaction Lagrangian density and gauge invariant in linear

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