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The singly charged $SU(2)_L$ singlet scalar, with its necessarily flavourviolating couplings to leptons, lends itself particularly well for anexplanation of the Cabibbo Angle Anomaly and of hints for lepton flavouruniversality violation in $\tau \to \mu\bar \nu\nu$. In a setup addressing bothanomalies, we predict loop-induced effects in $\tau\to e\gamma$ and in $\tau\to e\mu\mu$. A recast of ATLAS selectron and smuon searches allows us toderive a coupling-independent lower limit of $\approx 200$ GeV on the mass ofthe singly charged singlet scalar. At a future $e^+e^-$ collider, dark mattermono-photon searches could provide a complementary set of bounds.

Explaining the Cabibbo Angle Anomaly and Lepton Flavour Universality Violation in Tau Decays With a Singly-Charged Scalar Singlet