  I investigate a class of models with scalar and pseudoscalar solutions to the
g-2 anomaly in the mass range between 1 MeV and 40 GeV. In particular, I
investigate the constraints from BaBar, beam dump experiments and from Z decay
measured quantities. I find that most of the favored region in this mass range
is excluded except for a small window between ~30 MeV and 200 MeV. This open
window is expected to be covered by the proposed NA64 experiment. The results
can be readily applied to other proposed solutions of the anomaly, such as
solutions with Z0 or with the dark photon.
