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arxiv: 1601.07266 · v2 · pith:IEWSSPK5new · submitted 2016-01-27 · ⚛️ nucl-ex · hep-ph

First Search for Lorentz and CPT Violation in Double Beta Decay with EXO-200

EXO-200 Collaboration: J. B. Albert , P. S. Barbeau , D. Beck , V. Belov , M. Breidenbach , T. Brunner , A. Burenkov , G. F. Cao
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C. Chambers B. Cleveland M. Coon A. Craycraft T. Daniels M. Danilov S. J. Daugherty C. G. Davis J. Davis S. Delaquis A. Der Mesrobian-Kabakian R. DeVoe J. S. D\'iaz T. Didberidze J. Dilling A. Dolgolenko M. J. Dolinski M. Dunford W. Fairbank Jr. J. Farine S. Feyzbkhsh W. Feldmeier P. Fierlinger D. Fudenberg R. Gornea K. Graham G. Gratta C. Hall S. Homiller M. Hughes M. J. Jewell X. S. Jiang A. Johnson T. N. Johnson S. Johnston A. Karelin L. J. Kaufman R. Killick T. Koffas S. Kravitz R. Kr\"ucken A. Kuchenkov K. S. Kumar D. S. Leonard Y. H. Lin J. Ling R. MacLellan M. G. Marino B. Mong D. Moore R. Nelson O. Njoya A. Odian I. Ostrovskiy A. Piepke A. Pocar C. Y. Prescott F. Reti\'ere P. C. Rowson J. J. Russell A. Schubert D. Sinclair E. Smith V. Stekhanov M. Tarka T. Tolba R. Tsang K. Twelker J.-L. Vuilleumier P. Vogel A. Waite J. Walton T. Walton M. Weber L. J. Wen U. Wichoski J. Wood L. Yang Y.-R. Yen O.Ya. Zeldovich
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classification ⚛️ nucl-ex hep-ph
keywords betadecaydoubleexo-200firstsearchtextrmtimes
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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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