Same-Sign Tetralepton Signature at $\mu$TRISTAN

Lin-Kun Yan, Zhi-Long Han, Feng-Lan Shao +1

Naturally tiny neutrino masses can be explained by the low scale seesaw with heavy neutral lepton $N$ coupling to the neutrinophilic Higgs doublet ${\Phi }_{\nu }$, which obtains a much small…