TY  - JOUR
AU  - Ge, S. F.
AU  - Pasquini, P.
AU  - Tortola, M.
AU  - Valle, J. W. F.
PY  - 2017
DA  - 2017//
TI  - Measuring the leptonic CP phase in neutrino oscillations with nonunitary mixing
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 033005
EP  - 14pp
VL  - 95
IS  - 3
PB  - Amer Physical Soc
AB  - 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 μDAR 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 μDAR flux. We also show that the further addition of a near detector to the μDAR setup can eliminate the degeneracy completely.
SN  - 2470-0010
UR  - http://arxiv.org/abs/1605.01670
UR  - https://doi.org/10.1103/PhysRevD.95.033005
DO  - 10.1103/PhysRevD.95.033005
LA  - English
N1  - WOS:000394092900002
ID  - Ge_etal2017
ER  -