Search for new particles decaying to ZZ using final states with leptons and jets with the ATLAS detector in √s = 7 TeV proton–proton collisions

A search is presented for a narrow resonance decaying to a pair of Z bosons using data corresponding to 1.02 fb−1 of integrated luminosity collected by the ATLAS experiment from pp collisions at √s = 7 TeV. Events containing either four charged leptons (llll) or two charged leptons and two jets (ll j j) are analyzed and found to be consistent with the Standard Model background expectation. Lower limits on a resonance mass are set using the Randall–Sundrum (RS1) graviton model as a benchmark. Using both and j j events, an RS1 graviton with k/m¯ pl = 0.1 and mass between 325 and 845 GeV is excluded at 95% confidence level. In addition, the events are used to set a model-independent fiducial cross section limit of σfid(pp→ X →ZZ) < 0.92 pb at 95% confidence level for any new sources of ZZ production with mZZ greater than 300 GeV.