Abstract
In this work, we propose minimal realizations for generating Dirac neutrino masses in the context of a right-handed abelian gauge extension of the Standard Model. Utilizing only U(1)_R symmetry, we address and analyze the possibilities of Dirac neutrino mass generation via (a) tree-level seesaw and (b) radiative correction at the one-loop level. One of the presented radiative models implements the attractive scotogenic model that links neutrino mass with Dark Matter (DM), where the stability of the DM is guaranteed from a residual discrete symmetry emerging from U(1)_R. Since only the right-handed fermions carry non-zero charges under the U(1)_R, this framework leads to sizable and distinctive Left–Right asymmetry as well as Forward–Backward asymmetry discriminating from U(1)_{B-L} models and can be tested at the colliders. We analyze the current experimental bounds and present the discovery reach limits for the new heavy gauge boson Z^{prime } at the LHC and ILC. Furthermore, we also study the associated charged lepton flavor violating processes, dark matter phenomenology and cosmological constraints of these models.
Highlights
The originality of this work is, by employing only the gauged U (1)R symmetry, we construct Dirac neutrino masses at the tree-level and one-loop level which has not been done before and, by a detailed study of the phenomenology associated to the new heavy gauge boson, we show that U (1)R model is very promising to be discovered in the future colliders
In this work, we have explored the possibility of one of the most minimal gauge extensions of the SM which is U (1)R that is responsible for generating Dirac neutrino mass and may stabilize the Dark Matter (DM) particle
We have shown that a heavy Z (emerging from U (1)R), even if its mass is substantially higher than the center of mass energy available at the ILC, would manifest itself at tree-level by its propagator effects producing sizable contributions to the LR asymmetry or FB asymmetry
Summary
Our framework is a very simple extension of the SM: an abelian gauge extension under which only the right-handed fermions are charged. Such a charge assignment is anomalous, all the gauge anomalies can be canceled by the minimal extension of the SM with just three right-handed neutrinos Within this framework the minimal choice to generate the charged fermion masses is to utilize the already existing SM Higgs doublet, the associated Yukawa couplings have the form: Page 3 of 21 916. H (1, Since EW symmetry needs to break down around the O(100) GeV scale, one can compute the masses of the gauge bosons from the covariant derivatives associated with the SM Higgs H and the SM singlet scalar χ : Dμ H = ∂μ − igWμ − ig YH Bμ − igR RH Xμ H, (2.5).
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