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We consider a supersymmetric version of the standard model extended by anadditional U(1)_{B-L}. This model can be embedded in an mSUGRA-inspired modelwhere the mass parameters of the scalars and gauginos unify at the scale ofgrand unification. In this class of models the renormalization group equationevolution of gauge couplings as well as of the soft SUSY-breaking parametersrequire the proper treatment of gauge kinetic mixing. We first show that thishas a profound impact on the phenomenolgy of the Z' and as a consequence thecurrent LHC bounds on its mass are reduced significantly from about 1920 GeV to1725 GeV. They are even further reduced if the Z' can decay into supersymmetricparticles. Secondly, we show that in this way sleptons can be produced at theLHC in the 14 TeV phase with masses of several hundred GeV. In the case ofsquark and gluino masses in the multi-TeV range, this might become an importantdiscovery channel for sleptons up to 650 GeV (800 GeV) for an integratedluminosity of 100 fb^{-1} (300 fb^{-1}).

Implications of gauge kinetic mixing on Z' and slepton production at the LHC