Neutrinoless double beta decay (0$\nu\beta\beta$) is the most sensitive experimental probe to address the quest that whether neutrinos are Majorana or Dirac particles $$. The observation of 0$\nu\beta\beta$ would not only establish the Majorana nature of neutrinos but also provide direct information on neutrino masses and probe the neutrino mass hierarchy. The present work $$ would explore the required sensitivity for the upcoming projected 0$\nu\beta\beta$ experiments to probe the inverted mass hierarchy (IH) as well as non-degenerate (ND) normal mass hierarchy (NH). We studied the required exposures of 0$\nu\beta \beta$-projects as a function of the expected background (following “Discovery Potential at 3$\sigma$ with 50% probability” statistical scheme) before the experiments are performed. This work would address the crucial role of background suppression in the future 0$\nu\beta\beta$ experiments with sensitivity goals of approaching and covering ND-NH.
$$ M. Agostini, G. Benato, J. A. Detwiler, J. Menéndez, F. Vissani, “Toward the discovery of matter creation with neutrinoless double-beta decay”, arXiv:2202.01787 (2022).
$$ M. K. Singh, H. T. Wong, L. Singh, V. Sharma, V. Singh, and Q. Yue, “Exposure-background duality in the searches of neutrinoless double beta decay”, Phys. Rev. D 101, 013006 (2020).