Abstract
Measurements of the solar neutrino mass-squared difference from KamLAND and solar neutrino data are somewhat discrepant, perhaps due to nonstandard neutrino interactions in matter. We show that the zenith angle distribution of solar neutrinos at Hyper-Kamiokande and the energy spectrum of reactor antineutrinos at JUNO can conclusively confirm the discrepancy and detect new neutrino interactions.
Highlights
There is currently about a 2σ tension in measurements of the neutrino mass splitting, δm221 ≡ m22 − m21, from solar and reactor neutrino experiments [1]
The latest SK combined measurement of the day-night asymmetry is ASDKN ≡ 2(ΦD−ΦN )/(ΦD+ΦN ) = −3.3 ± 1.0 ± 0.5% [3], where ΦD (ΦN ) is the measured solar neutrino flux during the day.1. This day-night asymmetry is extracted for δm221 = 4.8 × 10−5 eV2, while the global best-fit value is δm221=7.5 × 10−5 eV2 [1], for which the day-night asymmetry is −1.7%
If this discrepancy is due to a new physical effect, future solar and reactor experiments that have better control of the systematic uncertainties and larger datasets will see a significant difference in their measurements of δm221, and could provide conclusive evidence for the existence of new physics
Summary
There is currently about a 2σ tension in measurements of the neutrino mass splitting, δm221 ≡ m22 − m21, from solar and reactor neutrino experiments [1]. The latest SK combined measurement of the day-night asymmetry is ASDKN ≡ 2(ΦD−ΦN )/(ΦD+ΦN ) = −3.3 ± 1.0 ± 0.5% [3], where ΦD (ΦN ) is the measured solar neutrino flux during the day (night).1 This day-night asymmetry is extracted for δm221 = 4.8 × 10−5 eV2, while the global best-fit value (which is dominated by KamLAND data [5]) is δm221=7.5 × 10−5 eV2 [1], for which the day-night asymmetry is −1.7%. Due to large uncertainties at SK, as shown, current experiments are not able to resolve the tension If this discrepancy is due to a new physical effect, future solar and reactor experiments that have better control of the systematic uncertainties and larger datasets will see a significant difference in their measurements of δm221, and could provide conclusive evidence for the existence of new physics.
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