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ZhETF, Vol. 135, No. 5, p. 871 (May 2009)
(English translation - JETP, Vol. 108, No. 5, p. 757, May 2009 available online at www.springer.com )

BILEPTON CONTRIBUTIONS TO THE NEUTRINOLESS DOUBLE BETA DECAY IN THE ECONOMICAL 3-3-1 MODEL
Soa D.V., Dong P.V., Huang T.T., Long H.N.

Received: May 29, 2008

PACS: 12.60.Fr, 14.80.Cp, 12.60.Cn

DJVU (86.1K) PDF (268.9K)

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)_0
u) decay are discussed. We show that the (ββ)_0
u decay in this model is due to both the Majorana $\langle M_{ u}\rangle_{L}$ and Dirac $\langle M_{ u}\rangle_{D}$ neutrino masses. If the mixing angle is in the range of the ratio of neutrino masses $\langle M_{ u}\rangle_{L}/\langle M_{ u}\rangle_{D}$ , 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.

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