Higgs boson decays to CP-odd scalars at the Fermilab Tevatron and beyond -art. no. 075003

In extended Higgs models, the Higgs boson may decay into a pair of light CP -odd scalars, with distinctive collider signatures. We study the ensuing Hi ggs signals at the upgraded Fermilab Tevatron, considering the subsequent d ecays of the scalars into pairs of gluons or photons. For CP-odd scalars li ghter than a few GeV, the Higgs boson manifests itself as a diphoton resona nce and can be discovered up to masses of a few hundred GeV. For heavier CP -odd scalars the reach extends at most up to Mh similar to 120 GeV. We also discuss the capabilities of the CERN LHC and lepton colliders in these cha nnels.