First Search For Lorentz And Cpt Violation In Double Beta Decay With Exo-200

J. B. Albert,P. S. Barbeau,D. Beck,V. Belov,M. Breidenbach,T. Brunner, A. Burenkov,G. F. Cao,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. Diaz, T. Didberidze,J. Dilling,A. Dolgolenko,M. J. Dolinski, M. Dunford, W. Fairbank,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. Kruecken,A. Kuchenkov,K. S. Kumar,D. S. Leonard,C. Licciardi, 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. Retiere,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

PHYSICAL REVIEW D（2016）

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摘要

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.

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