  We study some possible experimental consequences of new physics on the
spectrum and decays of bottomonium states below $B\bar{B}$ threshold. In
addition to lepton universality breaking in Upsilon decays, large widths of
pseudoscalar $\eta_b$ resonances and mixing with a non-standard CP-odd light
Higgs boson might smooth and shift the signal peak from hindered radiative M1
transitions between $\Upsilon$ and $\eta_b$ states in the photon energy
spectrum, as searched by CLEO. We also stress the relevance of forthcoming
results from CLEO on leptonic branching fractions of $\Upsilon$ resonances to
definitely check our hypothesis.
