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Search for Neutrinoless Double-Beta Decay in $^{136}$Xe with EXO-200

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arxiv 1205.5608 v2 pith:6FFFBGFJ submitted 2012-05-25 hep-ex nucl-ex

M. Auger , D. J. Auty , P. S. Barbeau , E. Beauchamp , V. Belov , C. Benitez-Medina , M. Breidenbach , T. Brunner
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A. Burenkov B. Cleveland S. Cook T. Daniels M. Danilov C. G. Davis S. Delaquis R. deVoe A. Dobi M. J. Dolinski A. Dolgolenko M. Dunford W. Fairbank Jr. J. Farine W. Feldmeier P. Fierlinger D. Franco G. Giroux R. Gornea K. Graham G. Gratta C. Hall K. Hall C. Hargrove S. Herrin M. Hughes A. Johnson T. N. Johnson A. Karelin L. J. Kaufman A. Kuchenkov K. S. Kumar D. S. Leonard F. Leonard D. Mackay R. MacLellan M. Marino B. Mong M. Montero Diez A. R. Muller R. Neilson R. Nelson A. Odian I. Ostrovskiy K. O'Sullivan C. Ouellet A. Piepke A. Pocar C. Y. Prescott K. Pushkin P. C. Rowson J. J. Russell A. Sabourov D. Sinclair S. Slutsky V. Stekhanov T. Tolba D. Tosi K. Twelker P. Vogel J.-L. Vuilleumier A. Waite T. Walton M. Weber U. Wichoski J. Wodin J. D. Wright L. Yang Y.-R. Yen O. Ya. Zeldovich
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classification hep-exnucl-ex
keywords decaydouble-betaneutrinolessbetaexo-200searchbackgroundcalculation
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We report on a search for neutrinoless double-beta decay of $^{136}$Xe with EXO-200. No signal is observed for an exposure of 32.5 kg-yr, with a background of ~1.5 x 10^{-3} /(kg yr keV) in the $\pm 1\sigma$ region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay $T_{1/2}^{0\nu\beta\beta}$($^{136}$Xe) > 1.6 x 10$^{25}$ yr (90% CL), corresponding to effective Majorana masses of less than 140-380 meV, depending on the matrix element calculation.

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Cited by 3 Pith papers

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  1. Towards the meV limit of the effective neutrino mass in neutrinoless double-beta decays

    hep-ph 2019-08 accept novelty 5.0 of 10

    Neutrinoless double-beta decay at 1 meV sensitivity would constrain the lightest neutrino mass to 0.7 to 8 meV and the Majorana phase rho to 130 to 230 degrees.

  2. Flavoured leptogenesis and ${\rm CP}^{\mu\tau}$ symmetry

    hep-ph 2019-08 conditional novelty 5.0 of 10

    In CPmu-tau symmetric seesaw models, flavoured leptogenesis works with M2/M1 as low as 4.7, lowering the old lower bound on M1 to about 7.5e9 GeV and allowing N2-dominated scenarios in roughly a quarter of the paramet...

  3. Phenomenological Study of Type II Seesaw with $\Delta(27)$ Symmetry

    hep-ph 2019-09 reject novelty 3.0 of 10

    A Δ(27) flavor-symmetric type-II seesaw model reproduces neutrino oscillation data only after an ad hoc diagonal perturbation is added, and its CP violation predictions reduce to parameter scans.

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