Calculation and comparison of sensitivities in $0\nu \beta \beta$ experiments based on key parameters

Abstract

Worldwide efforts are underway to detect neutrinoless double beta ($0\nu \beta \beta$) decay using experiments based on various technologies and target isotopes. Future experiments in this regard aim to exclude the inverted order (IO) condition or explore the normal order (NO) band. Consequently, comparing the sensitivities of proposed $0\nu \beta \beta$ decay experiments with promising prospects is essential. The current study adopts sensitivity metrics, including exclusion and discovery sensitivities, half-life sensitivities, and $m_{\beta \beta }$ sensitivities, to provide a comprehensive evaluation of ten typical promising experiments: LEGEND, CDEX, nEXO, XLZD, PandaX, NEXT, KamLAND-Zen, JUNO, SNO+, and CUPID, and highlight their unique features. Based on reported experimental parameters, the concept of a ``technical line'' is introduced to determine the location that each experiment may realize in the $\xi$ and ${\lambda }_b$ space, where $\xi$ represents the sensitive exposure per year, and ${\lambda }_b$ denotes the expected annual rate of background events. Half-life sensitivities for the selected experiments are calculated, some of them in multiple phases and others in conservative or aggressive condition. The results indicate that increasing the operation time is more beneficial for zero-background experiments, which also demonstrate greater competitiveness in discovery sensitivity. $m_{\beta \beta }$ sensitivities are presented as uncertainty bands arising from the nuclear matrix element uncertainties. Additionally, half-life and $m_{\beta \beta }$ sensitivities are estimated under ideal conditions also in the form of uncertainty bands, where only irreducible $2\nu \beta \beta$ and solar B-8 neutrino induced background remain.

arXiv comment14 pages, 7 figures. Version updated to match PRD version

References in corpus (20)

• Neutrinoless Double-Beta Decay: Status and Prospects
• Phase space factors for double-$\beta$ decay
• Final Results of GERDA on the Search for Neutrinoless Double-$\beta$ Decay
• Current Status and Future Prospects of the SNO+ Experiment
• Toward the discovery of matter creation with neutrinoless double-beta decay
• Search for Neutrinoless Double-Beta Decay with the Complete EXO-200 Dataset
• Solar Neutrinos: Status and Prospects
• Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen
• The Large Enriched Germanium Experiment for Neutrinoless Double Beta Decay (LEGEND)
• Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double beta decay
• NEXO: Neutrinoless double beta decay search beyond $10^{28}$ year half-life sensitivity
• Discovery probability of next-generation neutrinoless double-$\beta$ decay experiments
• The SNO+ Experiment
• New Limit for Neutrinoless Double-Beta Decay of ${}^{100}$Mo from the CUPID-Mo Experiment
• Final Result of the MAJORANA DEMONSTRATOR's Search for Neutrinoless Double-$\beta$ Decay in ${}^{76}$Ge
• PandaX-xT: a Multi-ten-tonne Liquid Xenon Observatory at the China Jinping Underground Laboratory
• Physics potential of searching for $0\nu \beta \beta$ decays in JUNO
• Solar neutrino-electron scattering as background limitation for double beta decay
• The Exposure-Background Duality in the Searches of Neutrinoless Double Beta Decay
• Neutrinoless Double Beta Decay Sensitivity of the XLZD Rare Event Observatory

Cited by in corpus (1)

• Neutrino Mass Hierarchy and Axion--Lepton Couplings in a Minimal Flavored $\nu$KSVZ Model