Searching for beyond the standard model physics using the improved description of 100Mo 2νββ decay spectral shape with CUPID-Mo

Augier, C.; Barabash, A. S.; Bellini, F.; Benato, G.; Beretta, M.; Bergé, L.; Billard, J.; Borovlev, Yu. A.; Cardani, L.; Casali, N.; Cazes, A.; Celi, E.; Chapellier, M.; Chiesa, D.; Dafinei, I.; Danevich, F. A.; De Jesus, M.; Dixon, T.; Dumoulin, L.; Eitel, K.; Ferri, F.; Fujikawa, B. K.; Gascon, J.; Gironi, L.; Giuliani, A.; Grigorieva, V. D.; Gros, M.; Helis, D. L.; Huang, H. Z.; Huang, R.; Imbert, L.; Juillard, A.; Khalife, H.; Kleifges, M.; Kobychev, V. V.; Kolomensky, Yu. G.; Konovalov, S. I.; Kotila, J.; Loaiza, P.; Ma, L.; Makarov, E. P.; De Marcillac, P.; Mariam, R.; Marini, L.; Marnieros, S.; Navick, X. F.; Nones, C.; Norman, E. B.; Olivieri, E.; Ouellet, J. L.; Pagnanini, L.; Pattavina, L.; Paul, B.; Pavan, M.; Peng, H.; Pessina, G.; Pirro, S.; Poda, D. V.; Polischuk, O. G.; Pozzi, S.; Previtali, E.; Redon, Th.; Rojas, A.; Rozov, S.; Sanglard, V.; Scarpaci, J. A.; Schmidt, B.; Shen, Y.; Shlegel, V. N.; Šimkovic, F.; Singh, V.; Tomei, C.; Tretyak, V. I.; Umatov, V. I.; Vagneron, L.; Velázquez, M.; Ware, B.; Welliver, B.; Winslow, L.; Xue, M.; Yakushev, E.; Zarytskyy, M.; Zolotarova, A. S.

doi:10.1140/epjc/s10052-024-13286-4

The current experiments searching for neutrinoless double-beta (0 nu beta beta) decay also collect large statistics of Standard Model allowed two-neutrino double-beta (2 nu beta beta) decay events. These can be used to search for Beyond Standard Model (BSM) physics via 2 nu beta beta decay spectral distortions. Mo-100 has a natural advantage due to its relatively short half-life, allowing higher 2 nu beta beta decay statistics at equal exposures compared to the other isotopes. We demonstrate the potential of the dual read-out bolometric technique exploiting a Mo-100 exposure of 1.47 kg x years, acquired in the CUPID-Mo experiment at the Modane underground laboratory (France). We set limits on 0 nu beta beta decays with the emission of one or more Majorons, on 2 nu beta beta decay with Lorentz violation, and 2 nu beta beta decay with a sterile neutrino emission. In this analysis, we investigate the systematic uncertainty induced by modeling the 2 nu beta beta decay spectral shape parameterized through an improved model, an effect never considered before. This work motivates searches for BSM processes in the upcoming CUPID experiment, which will collect the largest amount of 2 nu beta beta decay events among the next-generation experiments.

Searching for beyond the standard model physics using the improved description of 100Mo 2νββ decay spectral shape with CUPID-Mo / Augier, C.; Barabash, A. S.; Bellini, F.; Benato, G.; Beretta, M.; Bergé, L.; Billard, J.; Borovlev, Yu. A.; Cardani, L.; Casali, N.; Cazes, A.; Celi, E.; Chapellier, M.; Chiesa, D.; Dafinei, I.; Danevich, F. A.; De Jesus, M.; Dixon, T.; Dumoulin, L.; Eitel, K.; Ferri, F.; Fujikawa, B. K.; Gascon, J.; Gironi, L.; Giuliani, A.; Grigorieva, V. D.; Gros, M.; Helis, D. L.; Huang, H. Z.; Huang, R.; Imbert, L.; Juillard, A.; Khalife, H.; Kleifges, M.; Kobychev, V. V.; Kolomensky, Yu. G.; Konovalov, S. I.; Kotila, J.; Loaiza, P.; Ma, L.; Makarov, E. P.; de Marcillac, P.; Mariam, R.; Marini, L.; Marnieros, S.; Navick, X. F.; Nones, C.; Norman, E. B.; Olivieri, E.; Ouellet, J. L.; Pagnanini, L.; Pattavina, L.; Paul, B.; Pavan, M.; Peng, H.; Pessina, G.; Pirro, S.; Poda, D. V.; Polischuk, O. G.; Pozzi, S.; Previtali, E.; Redon, Th.; Rojas, A.; Rozov, S.; Sanglard, V.; Scarpaci, J. A.; Schmidt, B.; Shen, Y.; Shlegel, V. N.; Šimkovic, F.; Singh, V.; Tomei, C.; Tretyak, V. I.; Umatov, V. I.; Vagneron, L.; Velázquez, M.; Ware, B.; Welliver, B.; Winslow, L.; Xue, M.; Yakushev, E.; Zarytskyy, M.; Zolotarova, A. S.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - 84:9(2024), pp. 1-12. [10.1140/epjc/s10052-024-13286-4]