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arXiv · 1906.02723

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·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. Krücken·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. Retière·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
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Abstract

A search for neutrinoless double-beta decay ($0νββ$) in $^{136}$Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between $0νββ$ 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 $0νββ$ has been improved from $σ/E=1.23\%$ to $1.15\pm0.02\%$ with the upgraded detector. Accounting for the new data, the median 90% confidence level $0νββ$ 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 $0νββ$ is observed, leading to a lower limit on the $0νββ$ half-life of $3.5\cdot10^{25}$ yr at the 90% confidence level.

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G. Anton, I. Badhrees, P. S. Barbeau, D. Beck, V. Belov, T. Bhatta, M. Breidenbach, T. Brunner, 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. Krücken, 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. Retière, 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. 2019-10-18. Search for Neutrinoless Double-Beta Decay with the Complete EXO-200 Dataset. https://doi.org/10.1103/physrevlett.123.161802

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