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

Ferrario P. ; Benlloch-Rodríguez J.M. ; Díaz López G. ; Hernando Morata J.A. ; Kekic M. ; Renner J. ; Usón A. ; Gómez-Cadenas J.J. ; Adams C. ; Álvarez V. ; Arazi L. ; Arnquist I.J. ; Azevedo C.D.R. ; Bailey K. ; Ballester F. ; Borges F.I.G.M. ; Byrnes N. ; Cárcel S. ; Carrión J.V. ; Cebrían S. (Universidad de Zaragoza) ; Church E. ; Conde C.A.N. ; Contreras T. ; Díaz J. ; Diesburg M. ; Escada J. ; Esteve R. ; Felkai R. ; Fernandes A.F.M. ; Fernandes L.M.P. ; Ferreira A.L. ; Freitas E.D.C. ; Generowicz J. ; Ghosh S. ; Goldschmidt A. ; González-Díaz D. ; Guenette R. ; Gutíerrez R.M. ; Haefner J. ; Hafidi K. ; Hauptman J. ; Henriques C.A.O. ; Herrero P. ; Herrero V. ; Ifergan Y. ; Johnston S. ; Jones B.J.P. ; Labarga L. ; Laing A. ; Lebrun P. ; López-March N. ; Losada M. ; Mano R.D.P. ; Martín-Albo J. ; Martínez A. ; Martínez-Lema G. ; McDonald A.D. ; Monrabal F. ; Monteiro C.M.B. ; Mora F.J. ; Muñoz Vidal J. ; Novella P. ; Nygren D.R. ; Palmeiro B. ; Para A. ; Pérez J. ; Psihas F. ; Querol M. ; Repond J. ; Riordan S. ; Ripoll L. ; Rodríguez García Y. ; Rodríguez J. ; Rogers L. ; Romeo B. ; Romo-Luque C. ; Santos F.P. ; dos Santos J.M.F. ; Simón A. ; Sofka C. ; Sorel M. ; Stiegler T. ; Toledo J.F. ; Torrent J. ; Veloso J.F.C.A. ; Webb R. ; Weiss-Babai R. ; White J.T. ; Woodruff K. ; Yahlali N. ; The NEXT collaboration

Resumen: 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 228Th calibration source to produce signal-like and background-like events with energies near 1.6 MeV, a signal efficiency of 71.6 ± 1.5 stat± 0.3 sys% for a background acceptance of 20.6 ± 0.4 stat± 0.3 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. [Figure not available: see fulltext.

Idioma: Inglés

DOI: 10.1007/JHEP10(2019)052

Año: 2019

Publicado en: Journal of High Energy Physics 2019, 10 (2019), 52 [20 pp.]
ISSN: 1126-6708

Factor impacto JCR: 5.875 (2019)

Categ. JCR: PHYSICS, PARTICLES & FIELDS rank: 4 / 29 = 0.138 (2019) - Q1 - T1

Factor impacto SCIMAGO: 0.948 - Nuclear and High Energy Physics (Q2)

Financiación: info:eu-repo/grantAgreement/EC/FP7/339787/EU/Towards the NEXT generation of bb0nu experimets/NEXT
Financiación: info:eu-repo/grantAgreement/ES/MICINN/RTI2018-095979
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2014-53371-C04
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MDM-2016-0692
Financiación: info:eu-repo/grantAgreement/ES/MINECO/SEV-2014-0398

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Atóm.Molec.y Nucl. (Dpto. Física Teórica)