Abstract
We propose a model with an extra isospin doublet [Formula: see text] gauge symmetry, in which we introduce several extra fermions with odd parity under a discrete [Formula: see text] symmetry in order to cancel the gauge anomalies out. A remarkable issue is that we impose nonzero [Formula: see text] charge to the Standard Model Higgs, and it gives the most stringent constraint to the vacuum expectation value of a scalar field breaking the [Formula: see text] symmetry that is 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 the observed data.
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