  The extensions of the minimal supersymmetric model (MSSM), driving mainly
from the need to solve the \mu problem, involve novel matter species and gauge
groups. These extended MSSM models can be searched for at the LHC via the
effects of the gauge and Higgs bosons or their fermionic partners.
Traditionally, the focus has been on the study of the extra forces induced by
the new gauge and Higgs bosons present in such models. An alternative way of
studying such effects is through the superpartners of matter species and the
gauge forces. We thus consider a $U(1)^\prime$ gauge extension of the MSSM, and
perform an extensive study of the signatures of the model through the
production and decays of the scalar quarks and gluino, which are expected to be
produced copiously at the LHC. After a detailed study of the distinctive
features of such models with regard to the signatures at the LHC, we carry out
a detailed Monte Carlo analysis of the signals from the process pp-> n leptons
+ m jets + EMT, and compare the resulting distributions with those predicted by
the MSSM. Our results show that the searches for the extra gauge interactions
in the supersymmetric framework can proceed not only through the forces
mediated by the gauge and Higgs bosons but also through the superpartner forces
mediated by the gauge and Higgs fermions. Analysis of the events induced by the
squark/gluino decays presented here is complementary to the direct Z' searches
at the LHC.
