Abstract
The next-generation neutrino experiment JUNO will determine the solar oscillation parameters---${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{12}$ and $\mathrm{\ensuremath{\Delta}}{m}_{21}^{2}$---with great accuracy, in addition to measuring ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{13}$, $\mathrm{\ensuremath{\Delta}}{m}_{31}^{2}$, and the mass ordering. In parallel, the continued study of solar neutrinos at Hyper-Kamiokande will provide complementary measurements in the solar sector. In this paper, we address the expected sensitivity to nonuniversal and flavor-changing nonstandard interactions (NSI) with $d$-type quarks from the combination of these two future neutrino experiments. We also show the robustness of their measurements of the solar parameters ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{12}$ and $\mathrm{\ensuremath{\Delta}}{m}_{21}^{2}$ in the presence of NSI. We study the impact of the exact experimental configuration of the Hyper-Kamiokande detector, and conclude it is of little relevance in this scenario. Finally, we find that the LMA-D solution is expected to be present if no additional input from nonoscillation experiments is considered.
Highlights
The three-neutrino oscillation picture is well established from long-running studies of solar, reactor, atmospheric and accelerator neutrinos
Nonstandard neutrino interactions with matter will have a similar impact on oscillation parameters in the solar sector as those discussed in Eqs. (16) and (17) for solar neutrinos, with the key difference that, since reactors emit electron antineutrinos, the matter and nonstandard interactions (NSI) terms in the Hamiltonian will have an opposite sign to their counterparts in the case of neutrinos
Neutrino nonstandard interactions are known to alter the solar neutrino picture considerably, since they affect the mixing in the production region of the Sun and modify the day-night asymmetry expected from neutrino propagation through the Earth
Summary
The three-neutrino oscillation picture is well established from long-running studies of solar, reactor, atmospheric and accelerator neutrinos This quantum phenomenon can be parametrized in terms of two mass splittings (Δm221 and Δm231), three mixing angles (θ12, θ13, and θ23) and a phase accounting for CP nonconservation (δCP). There is a tension between recent results from T2K and NOνA on the value of δCP for the preferred mass ordering [4,5] These and other open questions will be addressed in both current and next-generation neutrino experiments [6,7,8,9]. We address the expected sensitivity of JUNO and Hyper-Kamiokande to NC-NSI with d-type quarks and test the robustness of their measurements of solar oscillation parameters in the face of NSI.
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