Bilepton Contributions to the Neutrinoless Double Beta Decay in the Economical 3-3-1 Model~1

摘要

A new bound of the mixing angle between charged gauge bosons (the standard-model Wand 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 _L and Dirac _D neutrino masses. If the mixing angle is in the range of the ratio of neutrino masses _L/_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.