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 $B\bar{B}$ 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 ${\rm Y}$ 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 ${\rm Y}$ resonances to definitely check our hypothesis.

6 pages, 2 eps figures

References in corpus (2)

• Search for eta_b(1S) in Inclusive Radiative Decays of the Upsilon(3S)
• Recent CLEO Upsilon(1S) and Upsilon(3S) Results

Cited by in corpus (1)

• Prospects of probing new physics in bottomonium decays and spectroscopy