Análise teórica e considerações experimentais do duplo decaimento beta sem neutrinos.

Abstract

In this work, each sector of the Left-Right symmetric model (LRSM) and its contributions to the half-life of neutrinoless double beta decay (0νββ) were theoretically analyzed. The constraints in the parameter space associated with the new mechanisms ⟨λ⟩ and ⟨η⟩ were calculated according to four considered scenarios, given by the current and future experimental limits for 0νββ decay in 76Ge, 130Te and 136Xe. In particular, it was found that the regions allowed for sensitivities of the current experiments are relatively equal for 130Te and 136Xe in both mechanism, and are slightly more restrictive in parameter space for 76Ge due to the limits imposed by the GERDA experiment. Since these limits in 76Ge were higher, we also calculated the mixing parameter of light and heavy neutrinos θ in both mechanisms. For the future limit scenarios, the regions are even more restrictive, especially in the case of 76Ge and 136Xe. The sensitivity in the effective mass of future experiments will reach the limit for inverted ordering as it is expected to eventually happen.