Fitting JUNO data with Lorentz invariance violation included moves the preferred neutrino mass ordering to inverted and sets new upper limits on CPT-even and CPT-odd LIV parameters.
First Search for Lorentz and CPT Violation in Double Beta Decay with EXO-200
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abstract
A search for Lorentz- and CPT-violating signals in the double beta decay spectrum of $^{136}$Xe has been performed using an exposure of 100 kg$\cdot$yr with the EXO-200 detector. No significant evidence of the spectral modification due to isotropic Lorentz-violation was found, and a two-sided limit of $-2.65 \times 10^{-5 } \; \textrm{GeV} < \mathring{a}^{(3)}_{\text{of}} < 7.60 \times 10^{-6} \; \textrm{GeV}$ (90% C.L.) is placed on the relevant coefficient within the Standard-Model Extension (SME). This is the first experimental study of the effect of the SME-defined oscillation-free and momentum-independent neutrino coupling operator on the double beta decay process.
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JUNO's Impact on the Neutrino Mass Ordering from Lorentz Invariance Violation
Fitting JUNO data with Lorentz invariance violation included moves the preferred neutrino mass ordering to inverted and sets new upper limits on CPT-even and CPT-odd LIV parameters.