Massive and massless gauge theories with flat connection

Yang - Mills type massive and massless gauge theories are interpreted in the geometrical frame of holomorphic principal bundles over a complex 2 - manifold. It is seen in this formalism that, the component (1; 1) of curvature of this connection appears because of flat connections generated by holomorphic structure although connection is flat. Thus it is possible to write a Lagrangian for a Yang - Mills theory including massive and massless gauge fields. However, the mass matrix of a massive gauge field on such a bundle isn't nilpotent and this field is generated by a noncommutative flat connection on the same bundle, then the structure group of this bundle is non - Abelian complex Lie group. However, if gauge field is massless, then this is generated by commutative flat connection, and so the structure group of bundle is Abelian complex Lie group. Also one sees that second Chern number or topological charge is proportional to the total volume of base manifold for each massless and massive gauge theories and Abelian (massless) gauge theories which is indeed the theories of Kähler potential on complex projective space CP2.