Nonunitarity of the lepton mixing matrix at the European Spallation Source

Abstract

If neutrinos get mass through the exchange of lepton mediators, as in seesaw schemes, the neutrino appearance probabilities in oscillation experiments are modified due to effective nonunitarity of the lepton mixing matrix. This also leads to new CP phases and an ambiguity in underpinning the ''conventional'' phase of the three-neutrino paradigm. We study the CP sensitivities of various setups based at the European spallation source neutrino super-beam (ESSnuSB) experiment in the presence of nonunitarity. We also examine its potential in constraining the associated new physics parameters. Moreover, we show how the combination of DUNE and ESSnuSB can help further improve the sensitivities on the nonunitarity parameters.

18 pages, 8 pdf figures, and 5 Tables. New figures and new discussions have been added. Version matches the published version of PRD

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Cited by in corpus (5)

• European Spallation Source as a searching tool for an ultralight scalar field
• Improved sensitivities of ESS$\nu$SB from a two-detector fit
• Leptonic neutral-current probes in a short-distance DUNE-like setup
• Testing lepton non-unitarity with the next generation of Germanium-based CE$\nu$NS reactor experiments
• Impact of unitarity violation on sensitivity of the leptonic CP phase at Hyper-Kamiokande and DUNE