A model with isospin doublet $U(1{)}_D$ gauge symmetry

Abstract

We propose a model with an extra isospin doublet $U(1{)}_D$ gauge symmetry, in which we introduce several extra fermions with odd parity under a discrete $Z_2$ symmetry in order to cancel the gauge anomalies out. A remarkable issue is that we impose nonzero $U(1{)}_D$ charge to the standard model Higgs, and it gives the most stringent constraint to the vacuum expectation value of a scalar field breaking the $U(1{)}_D$ symmetry that are severer than the LEP bound. We then explore relic density of a Majorana dark matter candidate without conflict of constraints from lepton flavor violating processes. A global analysis is carried out to search for parameters which can accommodate with observed data.

17 pages, 4 figures, 2 tables: version accepted for publication in Journal of Modern Physics A

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