Hiding neutrinoless double beta decay in the minimal seesaw model with the TM1 or μ–τ reflection symmetry

Abstract

AbstractIn Asakaet al(2021Phys. Rev. D103, 015014), Asaka, Ishida and Tanaka put forward an interesting possibility that the neutrinoless double beta decay can be hidden in the minimal seesaw model with the two right-handed neutrinos having a hierarchical mass structure: the lighter one is lighter enough than the typical Fermi-momentum scale of nuclei while the heavier one is sufficiently heavy to decouple from the neutrinoless double beta decay. Then, in the basis where the mass matrices of the charged leptons and right-handed neutrinos are diagonal, for some particular texture of the Dirac neutrino mass matrixMD, the neutrinoless double beta decay can be hidden. In this paper, on top of this specified model, we study the interesting scenario thatMDfurther obeys the TM1 symmetry orμ–τreflection symmetry which are well motivated by the experimental results for the neutrino mixing parameters.