Search for exotic resonances decaying into $V+Z$ using final states with a jet and a lepton pair

A search for new exotic particles decaying to the $VZ$ final state is performed, where $V$ is either a $W$ or a $Z$ boson decaying hadronically into two overlapping jets and the $Z$ decays to dielectrons or dimuons. The analysis uses 5.0~\ifb\, of $\sqrt{s}=7$~TeV data collected by the CMS experiment at the LHC in 2011. No significant excess is observed in the mass distribution of the $VZ$ candidates compared to the background expectation from Standard Model processes. Lower bounds at the 95\% confidence level are set on the mass of hypothetical particles decaying to the $VZ$ final state in several theoretical models. Sequential Standard Model $W^{\prime}\,$ bosons with masses between 700 and 929~GeV are excluded. In the Randall-Sundrum model for graviton resonances with $k/\overline{M}_{Pl} = $0.05, masses between 700 and 924~GeV are also excluded. These are the first results from the LHC on $VZ$ searches using final states with a boosted massive jet and a lepton pair.