Search for diboson resonances in the $llqq$ final state using pp collisions at $\sqrt{s} = 8$ TeV with the ATLAS detector

This talk presents a search for $WZ$ and $ZZ$ resonances in the $llqq$ final state, using the ATLAS detector, from pp collisions at $\sqrt{s} = 8$~TeV. Many beyond the Standard Model theories predict heavy vector boson pair resonances. The $llqq$ final state provides a larger branching ratio compared to the fully leptonic state and reduced backgrounds compared to the fully hadronic state. Jet substructure techniques and a new modification to lepton isolation are used to increase sensitivity to high-mass resonances. The bulk Randall-Sundrum graviton and the extended gauge model $W'$ boson are used as benchmark models.