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We propose a seesaw model with a hidden gauge symmetry $SU(2)_H \timesU(1)_X$ where two types of standard model singlet fermions in realizing aseesaw mechanism are organized into $SU(2)_H$ doublet. Then we formulate scalarand gauge sector, neutrino mass matrix and lepton flavor violations. In ourgauge sector, $Z$-$Z'$ mixing appears after spontaneous symmetry breaking andwe investigate constraint from $\rho$-parameter. In addition we discuss $Z'$production at the large hadron collider via $Z$-$Z'$ mixing, where $Z'$ tendsto dominantly decay into heavy neutrinos.

Seesaw model with hidden $SU(2)_H \times U(1)_X$ gauge symmetry