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Hadron Collider Signatures of Lepton Number Violation in the Type II Seesaw Model
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We examine the prospect of observing genuine lepton number violating (LNV) signals at hadron colliders in the context of the Type II seesaw mechanism. The model features smoking gun signals involving same-sign di-leptons and jets that may be the primary observable channel in certain regions of the parameter space. The flavour composition of final-state charged leptons in the minimal model is related to the origin of neutrino masses and is correlated with other rare processes, such as neutrinoless double beta decay. We review existing collider limits and provide sensitivity estimates from LNV signals at upcoming runs of the LHC, for zero and non-zero mass splittings between the scalar triplet components.
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Cited by 4 Pith papers
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Revised exclusion limits on doubly charged Higgs bosons from a reanalysis of the ATLAS multi-lepton search at $\sqrt{s} = 13$,TeV
The four-lepton signal efficiencies in ATLAS's doubly charged Higgs search exceed a strict analytical ceiling, so the corrected expected mass limits are roughly 100 GeV weaker.
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On the Robustness of type-II Seesaw Collider Searches
Adding a single effective operator that makes the doubly charged Higgs decay into two leptons and a photon weakens current ATLAS limits from ~1.1 TeV to ~0.7 TeV, but requiring a hard photon in the final state restore...
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High-energy cLFV at $\mu$TRISTAN: HNL extensions of the Standard Model
In HNL extensions of the Standard Model, mu+e- collisions at muTRISTAN could discover e-tau and mu-tau charged lepton flavour violation with sensitivity orders of magnitude beyond low-energy experiments and FCC-ee.
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Search for heavy Majorana neutrinos at muon-proton colliders via lepton-number-violating signals
Simulates LNV signals from heavy Majorana neutrinos (200-3000 GeV) at a 5.3 TeV μp collider and projects 2σ limits on |V_ℓN|² superior to LHC bounds for 100 fb⁻¹ and 1 ab⁻¹ luminosities.
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