Abstract
An alternative left–right model of quarks and leptons, where the SU(2)_R lepton doublet (nu ,l)_R is replaced with (n,l)_R so that n_R is not the Dirac mass partner of nu _L, has been known since 1987. Previous versions assumed a global U(1)_S symmetry to allow n to be identified as a dark-matter fermion. We propose here a gauge extension by the addition of extra fermions to render the model free of gauge anomalies, and just one singlet scalar to break U(1)_S. This results in two layers of dark matter, one hidden behind the other.
Highlights
The alternative left–right model [1] of 1987 was inspired by the E6 decomposition to the standard SU (3)C × SU (2)L × U (1)Y gauge symmetry through an SU (2)R, which does not have the conventional assignments of quarks and leptons
We show in this paper how it may be promoted to a gauge symmetry
As a result of this particle content, an automatic unbroken Z2 symmetry exists on top of U (1)S, which is broken to a conserved residual Z3 symmetry
Summary
The alternative left–right model [1] of 1987 was inspired by the E6 decomposition to the standard SU (3)C × SU (2)L × U (1)Y gauge symmetry through an SU (2)R, which does not have the conventional assignments of quarks and leptons. Instead of (u, d)R and (ν, l)R as doublets under SU (2)R, a new quark h and a new lepton n per family are added so that (u, h)R and (n, e)R are the SU (2)R doublets, and hL , dR, nL , νR are singlets. 5 the fermions are discussed with details of how they obtain masses. 7 we discuss the present phenomenological constraints on the new Z bosons and would-be dark-matter candidates. 8 we show an example of two viable dark-matter candidates, both in terms of relic abundance and direct detection.
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