  We suggest an extension of the gauge principle which includes tensor gauge
fields. In this extension of the Yang-Mills theory the vector gauge boson
becomes a member of a bigger family of gauge bosons of arbitrary large integer
spins. The proposed extension is essentially based on the extension of the
Poincar\'e algebra and the existence of an appropriate transversal
representations. The invariant Lagrangian is expressed in terms of new
higher-rank field strength tensors. It does not contain higher derivatives of
tensor gauge fields and all interactions take place through three- and
four-particle exchanges with a dimensionless coupling constant. We calculated
the scattering amplitudes of non-Abelian tensor gauge bosons at tree level, as
well as their one-loop contribution into the Callan-Symanzik beta function.
This contribution is negative and corresponds to the asymptotically free
theory. Considering the contribution of tensorgluons of all spins into the beta
function we found that it is leading to the theory which is conformally
invariant at very high energies. The proposed extension may lead to a natural
inclusion of the standard theory of fundamental forces into a larger theory in
which vector gauge bosons, leptons and quarks represent a low-spin subgroup. We
consider a possibility that inside the proton and, more generally, inside
hadrons there are additional partons - tensorgluons, which can carry a part of
the proton momentum. The extension of QCD influences the unification scale at
which the coupling constants of the Standard Model merge, shifting its value to
lower energies.
