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dc.contributor.authorThe NEXT collaboration
dc.contributor.authorAlmazán, H.
dc.contributor.authorAparicio Gil, Borja
dc.contributor.authorAranburu Leiva, Ane Izaskun
dc.contributor.authorBenlloch-Rodríguez, J.M.
dc.contributor.authorCossío Mora, Fernando Pedro ORCID
dc.contributor.authorFerrario, P.
dc.contributor.authorGenerowicz, J.
dc.contributor.authorGómez Cadenas, Juan J.
dc.contributor.authorHerrero, P.
dc.contributor.authorMartínez-Vara, M.
dc.contributor.authorMonrabal, Francesc
dc.contributor.authorOblak, E.
dc.contributor.authorOdriozola Gimeno, Mikel
dc.contributor.authorRipoll, L.
dc.contributor.authorRivilla de la Cruz, Iván ORCID
dc.contributor.authorRogero Blanco, Celia
dc.contributor.authorRomeo, B.
dc.contributor.authorRomo-Luque, C.
dc.contributor.authorSantos, F.P.
dc.contributor.authorDos Santos, J.M.F.
dc.contributor.authorSorel, M.
dc.contributor.authorStanford, C.
dc.contributor.authorTeixeira, J.M.R.
dc.contributor.authorThapa, P.
dc.contributor.authorToledo, J.F.
dc.contributor.authorTorrent, J.
dc.contributor.authorUsón, A.
dc.contributor.authorVeloso, J.F.C.A.
dc.contributor.authorVuong, T.T.
dc.contributor.authorWebb, R.
dc.contributor.authorWhite, J.T.
dc.contributor.authorWoodruff, K.
dc.contributor.authorYahlali, N.
dc.identifier.citationJournal of High Energy Physics 7 : 2021 // Article ID 146es_ES
dc.description.abstractNext-generation neutrinoless double beta decay experiments aim for half-life sensitivities of similar to 10(27) 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 Tl-208 1.6 MeV double escape peak (with Compton events as background), recorded in the NEXT-White demonstrator at the Laboratorio Subterraneo 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 similar to 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.es_ES
dc.description.sponsorshipThe NEXT Collaboration acknowledges support from the following agencies and institutions: the European Research Council (ERC) under the Advanced Grant 339787-NEXT; the European Union's Framework Programme for Research and Innovation Horizon 2020 (2014-2020) under the Grant Agreements No. 674896, 690575 and 740055; the Ministerio de Economia y Competitividad and the Ministerio de Ciencia, Innovacion y Universidades of Spain under grants FIS2014-53371-C04, RTI2018-095979, the Severo Ochoa Program grants SEV-2014-0398 and CEX2018-000867-S, and the Maria de Maeztu Program MDM-2016-0692; the Generalitat Valenciana under grants PROMETEO/2016/120 and SEJI/2017/011; the Portuguese FCT under project PTDC/FIS-NUC/2525/2014 and under projects UID/04559/2020 to fund the activities of LIBPhys-UC; the U.S. Department of Energy under contracts No. DE-AC02-06CH11357 (Argonne National Laboratory), DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), DE-FG02-13ER42020 (Texas A&M) and DE-SC0019223/DE-SC0019054 (University of Texas at Arlington); the University of Texas at Arlington (U.S.A.); and the Pazy Foundation (Israel) under grants 877040 and 877041. DGD acknowledges Ramon y Cajal program (Spain) under contract number RYC-2015-18820. JM-A acknowledges support from Fundacion Bancaria "la Caixa" (ID 100010434), grant code LCF/BQ/PI19/11690012. AS acknowledges support from the Kreitman School of Advanced Graduate Studies at Ben-Gurion University. Documentes_ES
dc.subjectdark matter and double beta decay (experiments)es_ES
dc.subjectdouble beta decayes_ES
dc.titleBoosting background suppression in the NEXT experiment through Richardson-Lucy deconvolutiones_ES
dc.rights.holderThis article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.es_ES
dc.rights.holderAtribución 3.0 España*
dc.contributor.funderEuropean Commission
dc.departamentoesQuímica orgánica Ies_ES
dc.departamentoeuKimika organikoa Ies_ES

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This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Except where otherwise noted, this item's license is described as This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.