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Search for Neutrinoless Double-Beta Decay with the Complete EXO-200 Dataset

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arxiv 1906.02723 v3 pith:5TLETNK2 submitted 2019-06-06 hep-ex nucl-ex

Search for Neutrinoless Double-Beta Decay with the Complete EXO-200 Dataset

G. Anton , I. Badhrees , P.S. Barbeau , D. Beck , V. Belov , T. Bhatta , M. Breidenbach , T. Brunner
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G.F. Cao W.R. Cen C. Chambers B. Cleveland M. Coon A. Craycraft T. Daniels M. Danilov L. Darroch S.J. Daugherty J. Davis S. Delaquis A. Der Mesrobian-Kabakian R. DeVoe J. Dilling A. Dolgolenko M.J. Dolinski J. Echevers W. Fairbank Jr. D. Fairbank J. Farine S. Feyzbakhsh P. Fierlinger D. Fudenberg P. Gautam R. Gornea G. Gratta C. Hall E.V. Hansen J. Hoessl P. Hufschmidt M. Hughes A. Iverson A. Jamil C. Jessiman M.J. Jewell A. Johnson A. Karelin L.J. Kaufman T. Koffas R. Kr\"ucken A. Kuchenkov K.S. Kumar Y. Lan A. Larson B.G. Lenardo D.S. Leonard G.S. Li S. Li Z. Li C. Licciardi Y.H. Lin R. MacLellan T. McElroy T. Michel B. Mong D.C. Moore K. Murray O. Njoya O. Nusair A. Odian I. Ostrovskiy A. Piepke A. Pocar F. Reti\`ere A.L. Robinson P.C. Rowson D. Ruddell J. Runge S. Schmidt D. Sinclair A.K. Soma V. Stekhanov M. Tarka J. Todd T. Tolba T.I. Totev B. Veenstra V. Veeraraghavan P. Vogel J.-L. Vuilleumier M. Wagenpfeil J. Watkins M. Weber L.J. Wen U. Wichoski G. Wrede S.X. Wu Q. Xia D.R. Yahne L. Yang Y.-R. Yen O.Ya. Zeldovich T. Ziegler
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classification hep-ex nucl-ex
keywords betabeencdotconfidencedatasetdecaydetectordouble-beta
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A search for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{136}$Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between $0\nu\beta\beta$ and background events. Relative to previous analyses, the signal detection efficiency has been raised from 80.8% to 96.4$\pm$3.0% and the energy resolution of the detector at the Q-value of $^{136}$Xe $0\nu\beta\beta$ has been improved from $\sigma/E=1.23\%$ to $1.15\pm0.02\%$ with the upgraded detector. Accounting for the new data, the median 90% confidence level $0\nu\beta\beta$ half-life sensitivity for this analysis is $5.0 \cdot 10^{25}$ yr with a total $^{136}$Xe exposure of 234.1 kg$\cdot$yr. No statistically significant evidence for $0\nu\beta\beta$ is observed, leading to a lower limit on the $0\nu\beta\beta$ half-life of $3.5\cdot10^{25}$ yr at the 90% confidence level.

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