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We study the decay modes of a new, light spin-0 particle, arguing that if themass of the (pseudo)scalar is ~11-15 GeV, it can have an appreciable branchingratio into bottomonium, in particular the rare eta's. Using non-relativisticQCD (NRQCD), we calculate its decay rate to bottomonia for mass splittingsgreater than the typical momentum transfer within the bound state. It canexceed that of decays to other Standard Model fermions under the assumption ofcouplings proportional to those of the Standard Model. At smaller splittings,where our computational methods break down, we estimate the rate intobottomonia using data-driven methods. When the spin-0 state decays tobottomonia whose mass is too light to produce B-meson pairs, we get aqualitatively new experimental signature, decays to b-quarks invisible tob-tagging. Such a light, spinless particle can arise in extended Higgs sectors,making this channel potentially observable in decay chains initiated by thesubdominant decay of a Standard Model-like Higgs to a pair of them.

Implications of a New Light Scalar Near the Bottomonium Regime