 DOCUMENT METADATASLAC Publication: SLAC-PUB-16585
SLAC Release Date: June 20, 2016
First Search for Lorentz and CPT Violation in Double Beta Decay with EXO-200
Collaboration, EXO-200.
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\cdotyr 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). ... Show Full 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\cdotyr 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. Show Partial Abstract
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