112051 20230519145552.0 doi 10.1007/JHEP07(2021)146 sideral 126565 ART-2021-126565 eng Simón A. Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution 2021 Access copy available to the general public Unrestricted Next-generation neutrinoless double beta decay experiments aim for half-life sensitivities of ~ 1027 yr, requiring suppressing backgrounds to < 1 count/tonne/yr. For this, any extra background rejection handle, beyond excellent energy resolution and the use of extremely radiopure materials, is of utmost importance. The NEXT experiment exploits differences in the spatial ionization patterns of double beta decay and single-electron events to discriminate signal from background. While the former display two Bragg peak dense ionization regions at the opposite ends of the track, the latter typically have only one such feature. Thus, comparing the energies at the track extremes provides an additional rejection tool. The unique combination of the topology-based background discrimination and excellent energy resolution (1% FWHM at the Q-value of the decay) is the distinguishing feature of NEXT. Previous studies demonstrated a topological background rejection factor of ~ 5 when reconstructing electron-positron pairs in the 208Tl 1.6 MeV double escape peak (with Compton events as background), recorded in the NEXT-White demonstrator at the Laboratorio Subterráneo de Canfranc, with 72% signal efficiency. This was recently improved through the use of a deep convolutional neural network to yield a background rejection factor of ~ 10 with 65% signal efficiency. Here, we present a new reconstruction method, based on the Richardson-Lucy deconvolution algorithm, which allows reversing the blurring induced by electron diffusion and electroluminescence light production in the NEXT TPC. The new method yields highly refined 3D images of reconstructed events, and, as a result, significantly improves the topological background discrimination. When applied to real-data 1.6 MeV e-e+ pairs, it leads to a background rejection factor of 27 at 57% signal efficiency. [Figure not available: see fulltext.]. © 2021, The Author(s). info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 6.376 2021 PHYSICS, PARTICLES & FIELDS 6 / 29 = 0.207 2021 Q1 T1 0.895 2021 Nuclear and High Energy Physics 2021 Q2 10.3 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Ifergan Y. Redwine A.B. Weiss-Babai R. Arazi L. Adams C. Almazán H. Álvarez V. Aparicio B. Aranburu A.I. Arnquist I.J. Azevedo C.D.R. Bailey K. Ballester F. Benlloch-Rodríguez J.M. Borges F.I.G.M. Byrnes N. Cárcel S. Carrión J.V. Cebrián S. Universidad de Zaragoza (orcid)0000-0002-6948-5101 Church E. Conde C.A.N. Contreras T. Cossío F.P. Denisenko A.A. Díaz G. Díaz J. Escada J. Esteve R. Felkai R. Fernandes L.M.P. Ferrario P. Ferreira A.L. Foss F. Freitas E.D.C. Freixa Z. Generowicz J. Goldschmidt A. Gómez-Cadenas J.J. González R. González-Díaz D. Gosh S. Guenette R. Gutiérrez R.M. Haefner J. Hafidi K. Hauptman J. Henriques C.A.O. Hernando Morata J.A. Herrero P. Herrero V. Ho J. Jones B.J.P. Kekic M. Labarga L. Laing A. Lebrun P. López-March N. Losada M. Mano R.D.P. Martín-Albo J. Martínez A. Martínez-Vara M. Martínez-Lema G. McDonald A.D. Meziani Z.-E. Monrabal F. Monteiro C.M.B. Mora F.J. Muñoz Vidal J. Newhouse C. Novella P. Nygren D.R. Oblak E. Odriozola-Gimeno M. Palmeiro B. Para A. Pérez J. Querol M. Renner J. Ripoll L. Rivilla I. Rodríguez García Y. Rodríguez J. Rogero C. Rogers L. Romeo B. Romo-Luque C. Santos F.P. dos Santos J.M.F. Sorel M. Stanford C. Teixeira J.M.R. Thapa P. Toledo J.F. Torrent J. Usón A. Veloso J.F.C.A. Vuong T.T. Webb R. White J.T. Woodruff K. Yahlali N. The NEXT collaboration 2004 390 Universidad de Zaragoza Dpto. Física Teórica Área Física Atóm.Molec.y Nucl. 2021, 7 (2021), 146 J. high energy phys. Journal of High Energy Physics 1126-6708 12079324 http://zaguan.unizar.es/record/112051/files/texto_completo.pdf Versión publicada 1732021 http://zaguan.unizar.es/record/112051/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:112051 articulos driver 2023-05-18-15:51:20 ARTICLE