Search for Neutrinoless Double- β 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,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,O. Ya. Zeldovich,T. Ziegler,EXO-200 Collaboration; 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; 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; O. Ya. Zeldovich; T. Ziegler; EXO-200 Collaboration

Search for Neutrinoless Double- β 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,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,O. Ya. Zeldovich,T. Ziegler,EXO-200 Collaboration;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;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;O. Ya. Zeldovich;T. Ziegler;EXO-200 Collaboration;

physical review letters 2019 Vol. 123 pp. 161802-

235

collaboration2019physicalsearch12

Abstract

A search for neutrinoless double-β decay (0νββ) in Xe136 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±3.0%, and the energy resolution of the detector at the Q value of Xe136 0νββ has been improved from σ/E=1.23% to 1.15±0.02% with the upgraded detector. Accounting for the new data, the median 90% confidence level 0νββ half-life sensitivity for this analysis is 5.0×1025 yr with a total Xe136 exposure of 234.1 kg yr. No statistically significant evidence for 0νββ is observed, leading to a lower limit on the 0νββ half-life of 3.5×1025 yr at the 90% confidence level.

Keywords

neutrinoless double half life neural confidence level double β β decay 0νββ half exo

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10.1103/physrevlett.123.161802

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