  An extension of the Standard Model is presented that leads to the possible
existence of new gauge bosons with masses in the range of a few TeV. Due to the
fact that their couplings to Standard Model fermions are strongly suppressed,
it is possible for them to be hidden from current searches. The model contains
additional generations of fermions with quantum numbers resembling those of the
Standard Model fermion generations but with a twist: their charge assignments
are such that their electric charges and chiralities are flipped with respect
to those of their corresponding Standard Model counterparts. This feature
provides a way to obtain potential dark matter candidates and the interesting
possibility for a Lepton number conserving dimension-five operator for Dirac
neutrino masses. The model implications associated to electroweak precision
parameters, flavor changing neutral currents, and diphoton rate contributions
are briefly discussed. The general assumptions of this set up are also used to
sketch a couple of variants of the model with peculiar features that could
motivate further study.

High Energy Physics - Phenomenology