Neutrinoless Double Beta Decay Sensitivity of the XLZD Rare Event Observatory

Abstract

The XLZD collaboration is developing a two-phase xenon time projection chamber with an active mass of 60 to 80 t capable of probing the remaining WIMP-nucleon interaction parameter space down to the so-called neutrino fog. In this work we show that, based on the performance of currently operating detectors using the same technology and a realistic reduction of radioactivity in detector materials, such an experiment will also be able to competitively search for neutrinoless double beta decay in ${}^{136}$Xe using a natural-abundance xenon target. XLZD can reach a 3$\sigma$ discovery potential half-life of 5.7$\times$10${}^{27}$ yr (and a 90% CL exclusion of 1.3$\times$10${}^{28}$ yr) with 10 years of data taking, corresponding to a Majorana mass range of 7.3-31.3 meV (4.8-20.5 meV). XLZD will thus exclude the inverted neutrino mass ordering parameter space and will start to probe the normal ordering region for most of the nuclear matrix elements commonly considered by the community.

29 pages, 7 figures

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Cited by in corpus (3)

• The XLZD Design Book: Towards the Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics
• Modified TM2 for Reproducing All Best-Fit Values of Neutrino Mixing Angles
• Calculation and comparison of sensitivities in $0\nu \beta \beta$ experiments based on key parameters