Interference effects for 0νββ decay in the left-right symmetric model

Neutrinoless double-β decay is considered to be an important low energy probe to test beyond the Standard Model physics. There are several potentially competing beyond the Standard Model mechanisms that can induce the process. In the present study we consider the extensively investigated beyond the Standard Model scenario of the left-right symmetric model and focus on interference between the most dominant diagrams of the process contributing to the overall decay rate. The analysis of the contributions of these interference terms is important for disentangling different mechanisms. The numerical values for maximum interference for several nuclides of experimental interest are calculated. It is observed that, for most of the interference terms, the contribution is smaller than 20% for all the nuclei considered in the study. However, the interference between the mass mechanisms (light and heavy) and η mechanism is observed to be in the range 30%–50%. The variation of the interference effect with the Q values is also studied.