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.
Robens, Symmetry13, 2341 (2021), 2106.02962
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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.