IBS Publications Repository: First search for Lorentz and CPT violation in double beta decay with EXO-200

First search for Lorentz and CPT violation in double beta decay with EXO-200

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Title: First search for Lorentz and CPT violation in double beta decay with EXO-200

Author(s): Albert, JB; Barbeau, PS; Beck, D; Belov, V; Breidenbach, M; Brunner, T; Burenkov, A; Cao, GF; Chambers, C; Cleveland, B; Coon, M; Craycraft, A; Daniels, T; Danilov, M; Daugherty, SJ; Davis, CG; Davis, J; Delaquis, S; Der Mesrobian-Kabakian, A; DeVoe, R; Diaz, JS; Didberidze, T; Dilling, J; Dolgolenko, A; Dolinski, MJ; Dunford, M; Fairbank, W; Farine, J; Feyzbkhsh, S; Feldmeier, W; Fierlinger, P; Fudenberg, D; Gornea, R; Graham, K; Gratta, G; Hall, C; Homiller, S; Hughes, M; Jewell, MJ; Jiang, XS; Johnson, A; Johnson, TN; Johnston, S; Karelin, A; Kaufman, LJ; Killick, R; Koffas, T; Kravitz, S; Krucken, R; Kuchenkov, A; Kumar, KS; D.S. Leonard; Licciardi, C; Lin, YH; Ling, J; MacLellan, R; Marino, MG; Mong, B; Moore, D; Nelson, R; Njoya, O; Odian, A; Ostrovskiy, I; Piepke, A; Pocar, A; Prescott, CY; Retiere, F; Rowson, PC; Russell, JJ; Schubert, A; Sinclair, D; Smith, E; Stekhanov, V; Tarka, M; Tolba, T; Tsang, R; Twelker, K; Vuilleumier, JL; Vogel, P; Waite, A; Walton, J; Walton, T; Weber, M; Wen, LJ; Wichoski, U; Wood, J; Yang, L; Yen, YR; Zeldovich, OY

Abstract: 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. © 2016 American Physical Society