Simulating lepton number violation induced by heavy neutrino-antineutrino oscillations at colliders

Abstract

We study pseudo-Dirac pairs of two almost mass-degenerate sterile Majorana neutrinos which generate light neutrino masses via a low-scale seesaw mechanism. These pseudo-Dirac heavy neutral leptons can oscillate between interaction eigenstates that couple to leptons and antileptons and thus generate oscillations between lepton number conserving and lepton number violating processes. With the phenomenological symmetry protected seesaw scenario (pSPSS), we introduce a minimal framework capable of describing the dominant features of low-scale seesaws at colliders and present a FeynRules implementation usable in Monte Carlo generators. Additionally, we extend MadGraph to simulate heavy neutrino-antineutrino oscillations and present results from such simulations.

arXiv commentPublished version, 39 pages, 18 figures, FeynRules model file and MadGraph patch available at https://feynrules.irmp.ucl.ac.be/wiki/pSPSS

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• Distinguishing Dirac and Majorana Heavy Neutrinos at Lepton Colliders
• Simulating lepton number violation induced by heavy neutrino-antineutrino oscillations at colliders
• New Physics Search at the CEPC: a General Perspective
• Confronting the low-scale seesaw and leptogenesis with neutrinoless double beta decay
• Beyond lepton number violation at the HL-LHC: Resolving heavy neutrino-antineutrino oscillations
• On the collider-testability of the type-I seesaw model with 3 right-handed neutrinos
• Large lepton number violation at colliders: predictions from the minimal linear seesaw mechanism