Non-unitarity, sterile neutrinos, and non-standard neutrino interactions
By Mattias Blennow, P. Coloma, Enrique Fernandez-Martinez, J. Hernández-García, J. Lopez-Pavon. 2016
169 citations recorded by the source corpus.
A bstractThe 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.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/95164bcc7f1f7ccd06071aa55147eaf7872693c4
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In Nuclear and High Energy Physics
Citations in the corpus
- Sterile neutrino Dark Matter (2018, background): “this is not a necessity, cf. e.g. [58]. Moreover, while the lack of evidence for deviations from unitarity in V or exotic signatures in the near detectors of neutrino experiments hints at >MeV [59], no denite conclusion can be drawn from this alone, and lower bounds on in specic models usually ”
- Neutrino non-standard interactions: A status report (2019, background): “en NSI and sterile neutrinos in this limit is well studied and shows that sterile neutrino is essentially equivalent to non-unitarity propagation or equivalently a modication of the matter potential [399]. The last one being for oscillations equivalent to a NSI. The eect of the sterile neutrinos can”
- Deep Underground Neutrino Experiment (DUNE), Far Detector Technical Design Report, Volume II: DUNE Physics (2020, background): “This pasteurization has been shown to be particularly well-suited for oscillation searches [360, 355] since, compared to other alternatives, it minimizes the departures of its unitary component U from the mixing angles that are directly measured in neutrino oscillation experiments when unitarity is ”