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Volume 282 - 38th International Conference on High Energy Physics (ICHEP2016) - Neutrino Physics
Global constraints on heavy neutrino seesaw mixing
J. Hernandez,* E. Fernandez-Martinez, J. Lopez-Pavon
*corresponding author
Full text: pdf
Pre-published on: 2017 February 06
Published on: 2017 April 19
We derive constraints on the mixing of heavy right-handed neutrinos with the SM fields in the most general Seesaw scenario where the heavy neutrinos are integrated out. Among the electroweak and flavour observables included in the global fit, $\mu\rightarrow e\gamma$ sets the present strongest bound on the additional neutrino mixing, while in the future it will be dominated by $\mu-e$ conversion in nuclei. Increasing its sensitivity in future experiments could probe Non-Unitarity in Lepton Flavour Violating processes. Nevertheless, in order to determine completely model-independent constraints, we provide a second set of bounds derived through a global fit that does not include LFV observables. These indirect constraints on the off-diagonal elements come from the diagonal bounds through the Schwarz inequality.
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