TY  - JOUR
AU  - Pompa, F.
AU  - Schwetz, T.
AU  - Zhu, J. Y.
PY  - 2023
DA  - 2023//
TI  - Impact of nuclear matrix element calculations for current and future neutrinoless double beta decay searches
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 104
EP  - 29pp
VL  - 06
IS  - 6
PB  - Springer
KW  - Baryon
KW  - Lepton Number Violation
KW  - Neutrino Interactions
AB  - 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 m(& beta;& beta;) 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 3 & sigma; bound can change between m(& beta;& beta;)< 40 meV and 600 meV. The sign-uncertainty may either boost the sensitivity of next-generation experiments beyond the region for m(& beta;& beta;) 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 m(& beta;& beta;) & GSIM; 40 meV and if the relative sign is known to be positive. Sensitivities will be dominated by the advanced Ge-76 and Xe-136 setups assumed here, but NME model-discrimination improves if data from a third isotope is added, e.g., from Te-130 or Mo-100.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2303.10562
UR  - https://doi.org/10.1007/JHEP06(2023)104
DO  - 10.1007/JHEP06(2023)104
LA  - English
N1  - WOS:001016276900003
ID  - Pompa_etal2023
ER  -