A light pseudoscalar near the Υ(1S) mass, mixing with two Higgs doublets in the alignment limit, accounts for the anomalous ditau rate while evading existing constraints.
Measurement of the branching fraction for $\Upsilon (1S) \to \tau^+ \tau^-$
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abstract
We have studied the leptonic decay of the $\Upsilon (1S)$ resonance into tau pairs using the CLEO II detector. A clean sample of tau pair events is identified via events containing two charged particles where exactly one of the particles is an identified electron. We find $B(\Upsilon(1S) \to \tau^+ \tau^-) = (2.61~\pm~0.12~{+0.09\atop{-0.13}})%$. The result is consistent with expectations from lepton universality.
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Hiding in the Shadow of the Upsilon: Ditaus from a Light Pseudoscalar
A light pseudoscalar near the Υ(1S) mass, mixing with two Higgs doublets in the alignment limit, accounts for the anomalous ditau rate while evading existing constraints.