Searching for new physics in Upsilon decays
Abstract
We study some possible experimental consequences of new physics on the spectrum and decays of bottomonium states below BB threshold. In addition to lepton universality breaking in Upsilon decays, large widths of pseudoscalar ηb 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 and ηb 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 resonances to definitely check our hypothesis.
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