THE PHENOMENOLOGY OF THE CP-ODD SCALAR IN 2-DOUBLET MODELS

We examine the phenomenology of the CP-odd scalar A(0) of two-Higgs-do ublet models. We explore the parameter space determined by triviality bounds and identify the regions where the A(0) can be detected at the LHC in each of the following modes: the inclusive two-photon decay mod e, the iota(+/-)gamma gamma X mode from t (t) over bar A(0) production and the A(0) --> Zh channel with the subsequent decay of the CP-even scalar h to two photons. We find that, while the iota(+/-)gamma gamma X mode is of limited usefulness, the other two modes can give viable s ignals in fairly large, and complementary, regions of parameter space.