Dynamical alignment of visible and dark sector gauge groups
  We discuss a dark family of lepton-like particles with their own "private"
gauge bosons under a local SU'(2)xU'(1) symmetry. The product of dark and
visible gauge groups SU'(2)xU'(1)xSU_w(2)xU_Y(1) is broken dynamically to the
diagonal (vector-like) subgroup SU(2)xU(1) through the coupling of two scalar
fields M_i to the Higgs field and the dark lepton-like particles. After
substituting vacuum expectation values for the fields M_i, the Higgs doublet
couples in the standard way to the left-handed SU'(2) doublet and right-handed
singlets of the dark gauge group, but not to the extra gauge bosons. This
defines a new Higgs portal, where the "dark leptons" can contribute to the dark
matter and interact with Standard Model matter through Higgs exchange. It also
defines a dark matter model with internal interactions. At low energies, the
Standard Model Higgs boson aligns the two electroweak-type symmetry groups in
the visible and dark sectors and generates the masses in both sectors. We also
identify charge assignments in the dark sector which allow for the formation of
dark atoms as bound states of dark lepton-like particles. The simplest
single-component dark matter version of the model predicts a dark matter mass
around 96 GeV, but the corresponding nucleon recoil cross section is ruled out
by the xenon based experiments. However, multi-component models or models with
a dark SU'(2) doublet mediator instead of the Higgs portal would still be
viable.
