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We study impacts of dimension-five lepton-number violating operatorsassociated with two same-sign weak bosons, $\ell^\pm \ell^{\prime \pm} W^\mpW^\mp$, on current and future experiments for neutrino oscillation,lepton-number violating rare processes and high-energy collider experiments.These operators can contain important information on the origin of tinyneutrino masses, which is independent of that from the so-called Weinbergoperator. We examine constraints on the coefficients of the operators by theneutrino oscillation data. Upper bounds on the coefficients are alsoinvestigated by using the data for processes of lepton number violation such asneutrinoless double beta decays and $\mu^-$-$e^+$ conversion. These operatorscan also be directly tested by searching for lepton-number violating dileptonproduction via the same-sign W boson fusion process at high-energy hadroncolliders like the Large Hadron Collider. We find that these operators can beconsiderably probed by these current and future experiments.

Probing charged lepton number violation via $\ell^\pm \ell^{\prime \pm} W^\mp W^\mp$