Demonstrating topological identification capabilities of the NEXT experiment at low pressure
Abstract
The NEXT-100 detector is a high-pressure xenon time projection chamber utilising electroluminescence amplification for sub-1% FWHM energy resolution and topological discrimination, two key attributes required to achieve the NEXT programme's overarching goal of detecting neutrinoless double beta decay ($0 νββ$). The detector has completed its first physics run at the Laboratorio Subterráneo de Canfranc (LSC), with xenon at a pressure of ∼4 bar. In this paper we report on the first validation of NEXT-100's topological performance and present the first topological analysis conducted at low pressure within the detector programme. A Monte Carlo study characterising the effects of pressure on track topology is presented, with qualitative agreement observed in data. We then demonstrate the topological discrimination capabilities for 0νββ-like events from 208Tl decays using a cut-based method considered the 'baseline' in NEXT's topological programme, upon which all future analyses will improve. The analysis described applies a set of selection cuts before implementing a background discrimination algorithm that yields a reported signal efficiency for double-electron tracks and background acceptance for single-electron tracks of 75.6 ± 1.9 (stat.) +3.4−4.1 (syst.) % and 14.7 ± 0.4 (stat.) +0.7−0.8 (syst.) %. These results demonstrate the excellent topological discrimination capabilities of the NEXT-100 detector in line with NEXT-White, which achieved a signal efficiency and background acceptance of 71.6 ± 1.5 (stat.) ± 0.3 (syst.) % and 20.6 ± 0.4 (stat.) ± 0.3 (syst.) % respectively.
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BibTeX
@misc{waiton2026demonstrating,
title = {{Demonstrating topological identification capabilities of the NEXT experiment at low pressure}},
author = {J. Waiton and H. Almazán and B. Palmeiro and G. Martínez-Lema and R. Guenette and V. Álvarez and L. Arazi and I. J. Arnquist and F. Auria-Luna and S. Ayet and Y. Ayyad and C. D. R. Azevedo and F. Ballester and J. E. Barcelon and M. del Barrio-Torregrosa and J. M. Benlloch-Rodríguez and F. I. G. M. Borges and A. Brodoline and C. Cabo and A. Castillo and E. Church and M. Cid and X. Cid and C. A. N. Conde and C. Cortes-Parra and F. P. Cossío and R. Coupe and E. Dey and P. Dietz and C. Echeverria and M. Elorza and R. Esteve and R. Felkai and L. M. P. Fernandes and P. Ferrario and P. Ferrero Mancheño and F. W. Foss and Z. Freixa and J. García-Barrena and J. J. Gómez-Cadenas and J. W. R. Grocott and J. Hauptman and C. A. O. Henriques and J. A. Hernando Morata and P. Herrero-Gómez and V. Herrero and C. Hervés Carrete and Y. Ifergan and A. F. B. Isabel and B. J. P. Jones and F. Kellerer and L. Larizgoitia and A. Larumbe and P. Lebrun and F. Lopez and N. López-March and R. Madigan and R. D. P. Mano and A. Marauri and A. P. Marques},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.12973},
eprint = {2609.12973},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.12973},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Demonstrating topological identification capabilities of the NEXT experiment at low pressure
AU - J. Waiton
AU - H. Almazán
AU - B. Palmeiro
AU - G. Martínez-Lema
AU - R. Guenette
AU - V. Álvarez
AU - L. Arazi
AU - I. J. Arnquist
AU - F. Auria-Luna
AU - S. Ayet
AU - Y. Ayyad
AU - C. D. R. Azevedo
AU - F. Ballester
AU - J. E. Barcelon
AU - M. del Barrio-Torregrosa
AU - J. M. Benlloch-Rodríguez
AU - F. I. G. M. Borges
AU - A. Brodoline
AU - C. Cabo
AU - A. Castillo
AU - E. Church
AU - M. Cid
AU - X. Cid
AU - C. A. N. Conde
AU - C. Cortes-Parra
AU - F. P. Cossío
AU - R. Coupe
AU - E. Dey
AU - P. Dietz
AU - C. Echeverria
AU - M. Elorza
AU - R. Esteve
AU - R. Felkai
AU - L. M. P. Fernandes
AU - P. Ferrario
AU - P. Ferrero Mancheño
AU - F. W. Foss
AU - Z. Freixa
AU - J. García-Barrena
AU - J. J. Gómez-Cadenas
AU - J. W. R. Grocott
AU - J. Hauptman
AU - C. A. O. Henriques
AU - J. A. Hernando Morata
AU - P. Herrero-Gómez
AU - V. Herrero
AU - C. Hervés Carrete
AU - Y. Ifergan
AU - A. F. B. Isabel
AU - B. J. P. Jones
AU - F. Kellerer
AU - L. Larizgoitia
AU - A. Larumbe
AU - P. Lebrun
AU - F. Lopez
AU - N. López-March
AU - R. Madigan
AU - R. D. P. Mano
AU - A. Marauri
AU - A. P. Marques
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2609.12973
UR - https://arxiv.org/abs/2609.12973
AB - The NEXT-100 detector is a high-pressure xenon time projection chamber utilising electroluminescence amplification for sub-1% FWHM energy resolution and topological discrimination, two key attributes required to achieve the NEXT programme's overarching goal of detecting neutrinoless double beta decay ($0 νββ$). The detector has completed its first physics run at the Laboratorio Subterráneo de Canfranc (LSC), with xenon at a pressure of ∼4 bar. In this paper we report on the first validation of NEXT-100's topological performance and present the first topological analysis conducted at low pressure within the detector programme. A Monte Carlo study characterising the effects of pressure on track topology is presented, with qualitative agreement observed in data. We then demonstrate the topological discrimination capabilities for 0νββ-like events from ^208Tl decays using a cut-based method considered the 'baseline' in NEXT's topological programme, upon which all future analyses will improve. The analysis described applies a set of selection cuts before implementing a background discrimination algorithm that yields a reported signal efficiency for double-electron tracks and background acceptance for single-electron tracks of 75.6 ± 1.9 (stat.) ^+3.4_−4.1 (syst.) % and 14.7 ± 0.4 (stat.) ^+0.7_−0.8 (syst.) %. These results demonstrate the excellent topological discrimination capabilities of the NEXT-100 detector in line with NEXT-White, which achieved a signal efficiency and background acceptance of 71.6 ± 1.5 (stat.) ± 0.3 (syst.) % and 20.6 ± 0.4 (stat.) ± 0.3 (syst.) % respectively.
ER -