Prospects of probing new physics in bottomonium decays and spectroscopy

TL;DR

This paper explores how a non-standard CP-odd Higgs could affect bottomonium decays and spectroscopy, potentially revealing new physics through observable effects like lepton universality breaking and mass shifts.

Contribution

It investigates the impact of a CP-odd Higgs on bottomonium decay patterns, mass splittings, and resonance widths, proposing new strategies for detecting light Higgs particles.

Findings

Possible lepton universality breaking in Upsilon decays

Mass shifts in bottomonium hyperfine splittings

Broader eta_b resonances affecting collider searches

Abstract

A non-standard CP-odd Higgs boson could induce a slight (but observable) lepton universality breaking in Upsilon leptonic decays. Moreover, mixing between such a pseudoscalar Higgs boson and $\eta_b$ states might shift their mass levels, thereby modifying the values of the $M_{\Upsilon(nS)}-M_{\eta_b(nS)}$ hyperfine spplitings predicted in the standard model. Besides, $\eta_b$ resonances could be broader than expected with potentially negative consequences for discovery in both $e^+e^-$ and hadron colliders. A scenario with a CP violating Higgs sector is also considered. Finally, further strategies to search for a light Higgs particle in bottomonium decays are outlined.