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Motivated by searches for so-called leptonic scalars at the LHC and therecent measurement of the $W$ boson's mass at the Tevatron, we revisit thephenomenology of the Zee-Babu model for neutrino masses and the ability todifferentiate it from the Type II Seesaw model at the LHC. We conclude thatthis task is much more difficult than previously believed. All inputs equal inthe two scenarios, we find that total and differential rates for producingpairs of doubly and singly charged scalars are identical in shape and onlydiffer in normalization. The normalization is given by the ratio of hadroniccross sections and can be unity. Differences in cross sections are small andcan be hidden by unknown branching rates. This holds for Drell-Yan,$\gamma\gamma$ fusion, and $gg$ fusion, as well as observables at LO and NLO inQCD. This likeness allows us to reinterpret Run II limits on the Type II Seesawand estimate projections for the HL-LHC. Using updated neutrino oscillationdata, we also find that some collider observables, e.g., leptonflavor-violating branching ratios, are now sufficiently precise to provide apath forward. Other means of discrimination are also discussed. As a byproductof this work, we report the availability of new Universal \texttt{FeynRules}Object libraries, the \texttt{SM\_ZeeBabu} UFO, that enable fully differentialsimulations up to NLO+LL(PS) with tool chains employing\texttt{MadGraph5\_aMC@NLO}.

Doubly Charged Higgs Boson Production at Hadron Colliders II: A Zee-Babu Case Study