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We analyze the symmetry group of massive Yang-Mills theories and theirquantization strongly motivated by an already proposed alternative to theStandard Model of electroweak interactions without Higgs. In these models themass generation of the intermediate vector bosons is based on a non-AbelianStueckelberg mechanism where the dynamics of the Goldstone-like bosons isaddressed by a partial-trace Non-Linear-Sigma piece of the Lagrangian. In spiteof the high non-linearity of the scalar sector, the existence of an infinitenumber of symmetries, extending the traditional gauge group, allows us tosketch a group-theoretical quantization algorithm specially suited tonon-linear systems, which departs from usual canonical quantization. On thequantum representation space of this extended symmetry group, a quantumHamiltonian preserving the representation is given, whose classical analogreproduces the equations of motion.

Symmetry group of massive Yang-Mills theories without Higgs and their quantization