HEM 2016: New ambiguity in probing CP violation in neutrino oscillations

hechoenmexico

New ambiguity in probing CP violation in neutrino oscillations

If neutrinos get mass a la seesaw 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.

Comments: 5 pages, 6 figures
Subjects: High Energy Physics – Phenomenology (hep-ph); High Energy Physics – Experiment (hep-ex)
Report number: IFIC/16-21
Cite as: arXiv:1604.05690 [hep-ph]
(or arXiv:1604.05690v1 [hep-ph] for this version)

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