Abstract
Nuclear matrix elements (NME) are a crucial input for the interpretation of neutrinoless double beta decay data. We consider a representative set of recent NME calculations from different methods and investigate the impact on the present bound on the effective Majorana mass mββ by performing a combined analysis of the available data as well as on the sensitivity reach of future projects. A crucial role is played by the recently discovered short-range contribution to the NME, induced by light Majorana neutrino masses. Depending on the NME model and the relative sign of the long- and short-range contributions, the current 3σ bound can change between mββ < 40 meV and 600 meV. The sign-uncertainty may either boost the sensitivity of next-generation experiments beyond the region for mββ predicted for inverted mass ordering or prevent even advanced setups to reach this region. Furthermore, we study the possibility to distinguish between different NME calculations by assuming a positive signal and by combining measurements from different isotopes. Such a discrimination will be impossible if the relative sign of the long- and short-range contribution remains unknown, but can become feasible if mββ ≳ 40 meV and if the relative sign is known to be positive. Sensitivities will be dominated by the advanced 76Ge and 136Xe setups assumed here, but NME model-discrimination improves if data from a third isotope is added, e.g., from 130Te or 100Mo.
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Acknowledgments
We thank Dong-Liang Fang, Javier Menendez and Bernd Schwingenheuer for useful discussions and comments on the manuscript. This work has been supported by the European Union’s Framework Programme for Research and Innovation Horizon 2020 under grant H2020-MSCA-ITN-2019/860881-HIDDeN. Jing-yu Zhu is supported partly by the China and Germany Postdoctoral Exchange Program from the Office of China Postdoctoral Council and the Helmholtz Centre under Grant No. 2020031 and by the National Natural Science Foundation of China under Grant No. 11835005 and 11947227.
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Pompa, F., Schwetz, T. & Zhu, JY. Impact of nuclear matrix element calculations for current and future neutrinoless double beta decay searches. J. High Energ. Phys. 2023, 104 (2023). https://doi.org/10.1007/JHEP06(2023)104
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DOI: https://doi.org/10.1007/JHEP06(2023)104