  We study the contribution of the torsion-descendent four-fermion contact
interaction to the decay width of a neutral (pseudo)scalar field into a fermion
pair. This new interaction comes from the existence of gravitational torsion in
models with extra dimensions. Additionally, we exemplify the formalism with two
examples: first, the variation of the considered branching ratio of the Higgs
in the context of the standard model, and second the proper variations of the
scalar and pseudo scalar fields of the type II-1 two Higgs doublets model.
