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Journal Article

Measuring the leptonic CP phase in neutrino oscillations with nonunitary mixing


Ge,  Shao-Feng
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Ge, S.-F., Pasquini, P., Tortola, M., & Valle, J. W. F. (2017). Measuring the leptonic CP phase in neutrino oscillations with nonunitary mixing. Physical Review D, 95(3): 033005. doi:10.1103/PhysRevD.95.033005.

Cite as: http://hdl.handle.net/21.11116/0000-0001-2640-C
Non-unitary neutrino mixing implies an extra CP violating phase that can fake the leptonic Dirac CP phase delta(CP) of the simplest three-neutrino mixing benchmark scheme. This would hinder the possibility of probing for CP violation in accelerator-type experiments. We take T2K and T2HK as examples to demonstrate the degeneracy between the "standard" (or "unitary") and "nonunitary" CP phases. We find, under the assumption of nonunitary mixing, that their CP sensitivities severely deteriorate. Fortunately, the TNT2K proposal of supplementing T2(H)K with a mu DAR source for better measurement of delta(CP) can partially break the CP degeneracy by probing both cos delta(CP) and sin delta(CP) dependences in the wide spectrum of the mu DAR flux. We also show that the further addition of a near detector to the mu DAR setup can eliminate the degeneracy completely.