Bilepton contributions to the neutrinoless double beta decay in the economical 3-3-1 model

Abstract

A new bound of the mixing angle between charged gauge bosons (the standard-model W and the bilepton Y) in the economical 3-3-1 model is given. Possible contributions of the charged bileptons to the neutrinoless double beta ((ββ)0v) decay are discussed. We show that the ((ββ)0v decay in this model is due to both the Majorana 〈Mv〉L and Dirac 〈Mv〉 D neutrino masses. If the mixing angle is in the range of the ratio of neutrino masses 〈M v〉L/〈M v〉D, the Majorana and Dirac masses are comparable to each other and both may give the main contribution to the decay. As a result, constraints on the bilepton mass are given. © 2009 Pleiades Publishing, Ltd.