Journal
PHYSICAL REVIEW D
Volume 93, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.93.072001
Keywords
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Funding
- Indiana University Center for Spacetime Symmetries (IUCSS)
- DFG [KL 1103/4-1]
- DOE
- NSF in the United States
- NSERC in Canada
- SNF in Switzerland
- IBS in Korea
- DFG Cluster of Excellence Universe in Germany
- CAS-IHEP Fund
- ISTCP in China [2015DFG02000]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
- [RFBR-14-02-00675]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1307362, 1132428] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1506459] Funding Source: National Science Foundation
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A search for Lorentz- and CPT-violating signals in the double beta decay spectrum of Xe-136 has been performed using an exposure of 100 kg . 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 x 10(-5) GeV < (a)(of),(,3r) < 7.60 x 10(-6) 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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