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Updated: Mar 16, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
New Ambiguity in Probing CP Violation in Neutrino Oscillations
O G Miranda1, M Tórtola2, J W F Valle2
1Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN, Apdo. Postal 14-740, 07000 Mexico, DF, Mexico.
Abstract:
If neutrinos get mass via the seesaw mechanism the mixing matrix describing neutrino oscillations can be effectively nonunitary. We show that in this case the neutrino appearance probabilities involve a new CP phase ϕ associated with nonunitarity. This leads to an ambiguity in extracting the "standard" three-neutrino phase δ_{CP}, which can survive even after neutrino and antineutrino channels are combined. Its existence should be taken into account in the planning of any oscillation experiment aiming at a robust measurement of δ_{CP}.
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