发表机构
University of Manchester; Donostia International Physics Center, BERC Basque Excellence Research Centre; Instituto de Física Corpuscular (IFIC), CSIC & Universitat de València; Instituto de Instrumentación para Imagen Molecular (I3M), Centro Mixto CSIC - Universitat Politècnica de València; Unit of Nuclear Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev; Pacific Northwest National Laboratory (PNNL); Universidad del Pais Vasco (UPV/EHU); Instituto Gallego de Física de（曼彻斯特大学; 圣塞巴斯蒂安国际物理中心，BERC巴斯克卓越研究中心; 粒子物理研究所（IFIC），西班牙国家科学研究委员会与巴伦西亚大学; 分子成像仪器研究所（I3M），西班牙国家科学研究委员会-巴伦西亚理工大学混合中心; 内盖夫本-古里安大学工程学院核工程系; 太平洋西北国家实验室; 巴斯克地区大学; 加利西亚物理学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文验证了NEXT-100探测器在低压（约4 bar）下的拓扑甄别能力，通过蒙特卡洛研究和切割方法，实现了对无中微子双β衰变事件的高效识别，信号效率75.6%，背景接受率14.7%。
AI 中文摘要
NEXT-100探测器是一种高压氙气时间投影室，利用电致发光放大实现亚1% FWHM能量分辨率和拓扑甄别，这是实现NEXT计划总体目标——探测无中微子双β衰变（$0 \nu \beta \beta$）——所需的两项关键属性。该探测器已在坎弗兰克地下实验室（LSC）完成了其首次物理运行，氙气压力约为4 bar。本文报告了NEXT-100拓扑性能的首次验证，并展示了探测器计划中首次在低压下进行的拓扑分析。我们提出了一项蒙特卡洛研究，表征压力对径迹拓扑的影响，并在数据中观察到定性一致。随后，我们利用基于切割的方法（被视为NEXT拓扑计划中的“基线”方法，所有未来分析都将在此基础上改进）展示了$0\nu \beta \beta$类事件与$^{208}$Tl衰变事件的拓扑甄别能力。所描述的分析在实施背景甄别算法之前应用了一组选择切割，该算法报告的双电子径迹信号效率和单电子径迹背景接受率分别为75.6 $\pm$ 1.9（统计）$^{+3.4}_{-4.1}$（系统）%和14.7 $\pm$ 0.4（统计）$^{+0.7}_{-0.8}$（系统）%。这些结果展示了NEXT-100探测器出色的拓扑甄别能力，与NEXT-White一致，后者分别实现了71.6 $\pm$ 1.5（统计）$\pm$ 0.3（系统）%的信号效率和20.6 $\pm$ 0.4（统计）$\pm$ 0.3（系统）%的背景接受率。
英文摘要
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 $\sim$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 $^{208}$Tl 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 $\pm$ 1.9 (stat.) $^{+3.4}_{-4.1}$ (syst.) % and 14.7 $\pm$ 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 $\pm$ 1.5 (stat.) $\pm$ 0.3 (syst.) % and 20.6 $\pm$ 0.4 (stat.) $\pm$ 0.3 (syst.) % respectively.
Comments14 pages, 6 appendix + references
