  A search for heavy narrow resonances decaying into four-lepton final states
from cascade decays of a Z' boson has been performed using proton-proton
collision data at sqrt(s) = 8 TeV collected by the CMS experiment,
corresponding to an integrated luminosity of 19.7 inverse femtobarns. No excess
of events over the standard model background expectation is observed. Upper
limits for a benchmark model on the product of cross section and branching
fraction for the production of these heavy narrow resonances are presented. The
limit excludes leptophobic Z' bosons with masses below 2.5 TeV within the
benchmark model. This is the first result to constrain a leptophobic Z'
resonance in the four-lepton channel.
