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A complete and explicit classification of generalized, or local, symmetriesof massless free fields of spin $s \geq 1/2$ is carried out. Up to equivalence,these are found to consists of the conformal symmetries and their duals, newchiral symmetries of order $2s$, and their higher-order extensions obtained byLie differentiation with respect to conformal Killing vectors. In particular,the results yield a complete classification of generalized symmetries of theDirac-Weyl neutrino equation, Maxwell's equations, and the linearized gravityequations.

Generalized Symmetries of Massless Free Fields on Minkowski Space