  In this paper it will be shown that the Standard Model in 3+1 dimensions is a
gauge fixed version of a 2T-physics field theory in 4+2 dimensions, thus
establishing that 2T-physics provides a correct description of Nature from the
point of view of 4+2 dimensions. The 2T formulation leads to phenomenological
consequences of considerable significance. In particular, the higher structure
in 4+2 dimensions prevents the problematic F*F term in QCD. This resolves the
strong CP problem without a need for the Peccei-Quinn symmetry or the
corresponding elusive axion. Mass generation with the Higgs mechanism is less
straightforward in the new formulation of the Standard Model, but its
resolution leads to an appealing deeper physical basis for mass, coupled with
phenomena that could be measurable. In addition, there are some brand new
mechanisms of mass generation related to the higher dimensions that deserve
further study. The technical progress is based on the construction of a new
field theoretic version of 2T-physics including interactions in an action
formalism in d+2 dimensions. The action is invariant under a new type of gauge
symmetry which we call 2Tgauge-symmetry in field theory. This opens the way for
investigations of the Standard Model directly in 4+2 dimensions, or from the
point of view of various embeddings of 3+1 dimensions, by using the duality,
holography, symmetry and unifying features of 2T-physics.
