Non-unitarity, sterile neutrinos, and non-standard neutrino interactionsReport as inadecuate

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Journal of High Energy Physics

, 2017:153

First Online: 27 April 2017Received: 29 October 2016Revised: 11 April 2017Accepted: 13 April 2017DOI: 10.1007-JHEP042017153

Cite this article as: Blennow, M., Coloma, P., Fernandez-Martinez, E. et al. J. High Energ. Phys. 2017 2017: 153. doi:10.1007-JHEP042017153Abstract

The simplest Standard Model extension to explain neutrino masses involves the addition of right-handed neutrinos. At some level, this extension will impact neutrino oscillation searches. In this work we explore the differences and similarities between the case in which these neutrinos are kinematically accessible sterile neutrinos or not mixing matrix non-unitarity. We clarify apparent inconsistencies in the present literature when using different parametrizations to describe these effects and recast both limits in the popular neutrino non-standard interaction NSI formalism. We find that, in the limit in which sterile oscillations are averaged out at the near detector, their effects at the far detector coincide with non-unitarity at leading order, even in presence of a matter potential. We also summarize the present bounds existing in both limits and compare them with the expected sensitivities of near-future facilities taking the DUNE proposal as a benchmark. We conclude that non-unitarity effects are too constrained to impact present or near future neutrino oscillation facilities but that sterile neutrinos can play an important role at long baseline experiments. The role of the near detector is also discussed in detail.

KeywordsBeyond Standard Model Neutrino Physics ArXiv ePrint: 1609.08637

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Author: Mattias Blennow - Pilar Coloma - Enrique Fernandez-Martinez - Josu Hernandez-Garcia - Jacobo Lopez-Pavon



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