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Demonstration of the event identification capabilities of the NEXT-White detector

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arxiv 1905.13141 v3 pith:6ES2DELO submitted 2019-05-30 physics.ins-det hep-ex

Demonstration of the event identification capabilities of the NEXT-White detector

NEXT Collaboration: P. Ferrario , J.M. Benlloch-Rodr\'iguez , G. D\'iaz L\'opez , J.A. Hernando Morata , M. Kekic , J. Renner , A. Us\'on , J.J. G\'omez-Cadenas
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C. Adams V. \'Alvarez L. Arazi I.J. Arnquist C.D.R Azevedo K. Bailey F. Ballester F.I.G.M. Borges N. Byrnes S. C\'arcel J.V. Carri\'on S. Cebri\'an E. Church C.A.N. Conde T. Contreras J. D\'iaz M. Diesburg J. Escada R. Esteve R. Felkai A.F.M. Fernandes L.M.P. Fernandes A.L. Ferreira E.D.C. Freitas J. Generowicz S. Ghosh A. Goldschmidt D. Gonz\'alez-D\'iaz R. Guenette R.M. Guti\'errez J. Haefner K. Hafidi J. Hauptman C.A.O. Henriques P. Herrero V. Herrero Y. Ifergan S. Johnston B.J.P. Jones L. Labarga A. Laing P. Lebrun N. L\'opez-March M. Losada R.D.P. Mano J. Mart\'in-Albo A. Mart\'inez G. Mart\'inez-Lema A.D. McDonald F. Monrabal C.M.B. Monteiro F.J. Mora J. Mu\~noz Vidal P. Novella D.R. Nygren B. Palmeiro A. Para J. P\'erez F. Psihas M. Querol J. Repond S. Riordan L. Ripoll Y. Rodr\'iguez Garc\'ia J. Rodr\'iguez L. Rogers B. Romeo C. Romo-Luque F.P. Santos J.M.F. dos Santos A. Sim\'on C. Sofka M. Sorel T. Stiegler J.F. Toledo J. Torrent J.F.C.A. Veloso R. Webb R. Weiss-Babai J.T. White K. Woodruff N. Yahlali
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classification physics.ins-det hep-ex
keywords textrmbackgrounddetectorcarlodecaydoubleefficiencyenergies
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In experiments searching for neutrinoless double-beta decay, the possibility of identifying the two emitted electrons is a powerful tool in rejecting background events and therefore improving the overall sensitivity of the experiment. In this paper we present the first measurement of the efficiency of a cut based on the different event signatures of double and single electron tracks, using the data of the NEXT-White detector, the first detector of the NEXT experiment operating underground. Using a \TO\ calibration source to produce signal-like and background-like events with energies near 1.6 MeV, a signal efficiency of $71.6 \pm 1.5_{\textrm{ stat}} \pm 0.3_{\textrm{ sys}} \%$ for a background acceptance of $20.6 \pm 0.4_{\textrm{ stat}} \pm 0.3_{\textrm{ sys}} \%$ is found, in good agreement with Monte Carlo simulations. An extrapolation to the energy region of the neutrinoless double beta decay by means of Monte Carlo simulations is also carried out, and the results obtained show an improvement in background rejection over those obtained at lower energies.

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