Search for Heavy Right Handed Neutrinos at the FCC-ee

Abstract

The Standard Model of particle physics is still lacking an understanding of the generation and nature of neutrino masses. A favorite theoretical scenario (the see-saw mechanism) is that both Dirac and Majorana mass terms are present, leading to the existence of heavy partners of the light neutrinos, presumably massive and nearly sterile. These heavy neutrinos can be searched for at high energy lepton colliders of very high luminosity, such as the Future electron-positron e+e- Circular Collider, FCC-ee (TLEP), presently studied within the Future Circular Collider design study at CERN, as a possible first step. A first look at sensitivities, both from neutrino counting and from direct search for heavy neutrino decay, are presented. The number of neutrinos should be measurable with a precision between 0.001 - 0.0004, while the direct search appears very promising due to the long lifetime of heavy neutrinos for small mixing angles. A sensitivity down to a heavy-light mixing of 10^{-12} is obtained, covering a large phase-space for heavy neutrino masses between 10 and 80 GeV/c2.

Contribution to ICHEP 2014, Valencia

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• Lepton flavor violating Z decays: A promising window to low scale seesaw neutrinos
• Sterile neutrino Dark Matter production from scalar decay in a thermal bath
• On neutrinoless double beta decay in the $\nu$MSM
• Fermion number violating effects in low scale leptogenesis
• Lepton number violation by heavy Majorana neutrino in $B$ decays
• Higgs production from sterile neutrinos at future lepton colliders
• Initial condition for baryogenesis via neutrino oscillation
• Physics case of FCC-ee
• Perturbativity in the seesaw mechanism
• Neutrinophilic two Higgs doublet model with $U(1)$ global symmetry
• Rare Z Decays and Neutrino Flavor Universality
• Heavy Neutrinos at Future Colliders
• On the lepton-nucleon neutral and charged current deep inelastic scattering cross sections
• Precision Electroweak measurements at the FCC-ee
• Testable Baryogenesis in Seesaw Models (NuFact 2016)