  This proceeding is based on hep-th/0605225 and it shows that the most general
anomaly related effective action contains Stuckelberg, axionic and
Chern-Simons-like couplings. Such couplings are generically non-trivial in
orientifold string vacua. A similar analysis in quantum field theories provides
similar couplings. These Chern-Simons couplings generate new signals which
might be visible at LHC.
