  We study the physics of Kaluza-Klein (KK) top quarks in the framework of a
non-minimal Universal Extra Dimension (nmUED) with an orbifolded (S1/Z2) flat
extra spatial dimension in the presence of brane-localized terms (BLTs). In
general, BLTs affect the masses and the couplings of the KK excitations in a
non-trivial way including those for the KK top quarks. On top of that, BLTs
also influence the mixing of the top quark chiral states at each KK level and
trigger mixings among excitations from different levels with identical KK
parity (even or odd). The latter phenomenon of mixing of KK levels is not
present in the popular UED scenario known as the minimal UED (mUED) at the tree
level. Of particular interest are the mixings among the KK top quarks from
level `0' and level `2' (driven by the mass of the Standard Model (SM) top
quark). These open up new production modes in the form of single production of
a KK top quark and the possibility of its direct decays to Standard Model (SM)
particles leading to rather characteristic signals at the colliders.
Experimental constraints and the restrictions they impose on the nmUED
parameter space are discussed. The scenario is implemented in MadGraph 5 by
including the quark, lepton, the gauge-boson and the Higgs sectors up to the
second KK level. A few benchmark scenarios are chosen for preliminary studies
of the decay patterns of the KK top quarks and their production rates at the
LHC in various different modes. Recast of existing experimental analyzes in
scenarios having similar states is found to be not so straightforward for the
KK top quarks of the nmUED scenario under consideration.
