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Probing Lepton Number Violation at Same-Sign Lepton Colliders
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abstract
Same-sign lepton colliders offer a promising environment to probe lepton number violation. We study processes that change lepton number by two units in the context of Majorana heavy neutral leptons and neutrinophilic scalars at $\mu$TRISTAN, a proposed same-sign muon collider. Our work shows that such colliders, with modest energy and luminosity requirements, can either reveal direct evidence of lepton number violation or significantly constrain unexplored regions of parameter space, especially in the case of a neutrinophilic scalar.
Forward citations
Cited by 3 Pith papers
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Neutrino t-channels at Colliders: When Light Neutrinos Matter
The same-sign WW→ℓℓ t-channel signal for heavy Majorana neutrinos is cancelled by light-neutrino contributions in the seesaw model; the opposite-sign eµjj channel is a better probe.
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Multiboson Signatures of Doubly Charged Scalars at a Same-Sign Muon Collider
A same-sign muon collider at 2 TeV with 1 ab^-1 could reach 2-sigma sensitivity to Type-II seesaw doubly charged scalars decaying to WW up to roughly 425-430 GeV, slightly extending current LHC coverage.
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Vector Boson Fusion Signatures of Superheavy Majorana Neutrinos at Muon Colliders
Future muon colliders could probe heavy Majorana neutrino masses via t-channel vector boson fusion, with projected exclusions in the (mass, mixing) plane from cut-based and BDT analyses.
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