New ambiguity in probing CP violation in neutrino oscillations

Abstract

If neutrinos get mass via the seesaw mechanism the mixing matrix describing neutrino oscillations can be effectively non-unitary. We show that in this case the neutrino appearance probabilities involve a new CP phase, phi, associated to non-unitarity. This leads to an ambiguity in extracting the "standard" three--neutrino phase delta_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 delta_CP.

6 pages, 6 figures, matches published version

References in corpus (4)

• Neutrino oscillations refitted
• CP Violation and Neutrino Oscillations
• Heavy neutrino signals at large hadron colliders
• The low-scale approach to neutrino masses

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