Non-unitarity of the leptonic mixing matrix: present bounds and future sensitivities

By S. Antusch, O. Fischer. Journal of High Energy Physics, 2014

249 citations recorded by the source corpus.

The non-unitarity of the effective leptonic mixing matrix at low energies is a generic signal of extensions of the Standard Model (SM) with extra fermionic singlet particles, i.e. “sterile” or “right-handed” neutrinos, to account for the observed neutrino masses. The low energy effects of such extensions can be described in a model-independent way by the Minimal Unitarity Violation (MUV) scheme, an effective field theory extension of the SM. We perform a global fit of the MUV scheme parameters to the present experimental data, which yields the up-to-date constraints on leptonic non-unitarity. Furthermore, we investigate the sensitivities and discovery prospects of future experiments. In particular, FCC-ee/TLEP would be a powerful probe of flavour-conserving non-unitarity for singlet masses up to ∼60 TeV. Regarding flavour-violating non-unitarity, future experiments on muon-to-electron conversion in nuclei could even probe extensions with singlet masses up to ∼0.3 PeV.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ea9b60b4520e126086b37c7e5bd5941d03e07d2f

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In Nuclear and High Energy Physics

1. M. Drewes
2. Z. Xing
3. Julien Lesgourgues
4. M. Tórtola
5. M. Maltoni
6. S. Pastor
7. Y. Farzan
8. T. Schwetz

Citations in the corpus

• A White Paper on keV sterile neutrino Dark Matter (2016, background): “[67, 71, 170, 241] and references therein for a recent summary.”
• Heavy Majorana neutrinos from Wγ fusion at hadron colliders (2014, methodology): “Bounds on mixing from 0νββ [42, 43] and EW precision data [44–47] indicate that the 14TeV LHC is sensitive to Majorana neutrinos with mass between 10 and 375GeV after 100 fb−1 of data [27].”
• Neutrinoless double beta decay versus other probes of heavy sterile neutrinos (2019, methodology): “Upper limits on the muon-sterile mixing strength have been placed above mN ∼ 1 MeV by PSI [219], PIENU [220], KEK [221, 222], PS191 [96], measurements of the muon decay spectrum [223], Super-Kamiokande [224], E949 [225], NA62 [226], T2K [98], MicroBooNE [227], a variety of LNV meson decays [39, 82, ”
• Prospects for beyond the Standard Model physics searches at the Deep Underground Neutrino Experiment (2020, background): “If the more stringent priors of order 10−3 stemming from flavor and electroweak precision observables are added [47,54], the standard sensitivity is obtained.”
• Deep Underground Neutrino Experiment (DUNE), Far Detector Technical Design Report, Volume II: DUNE Physics (2020, background): “The phenomenological implications of a non-unitary leptonic mixing matrix have been extensively studied in flavor and electroweak precision observables as well as in the neutrino oscillation phenomenon [363, 141, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 360, 53”