Semileptonic (lepton, neutrino and jets) $WW/WZ$ resonances search at $\sqrt{s} = 8$~TeV with the ATLAS detector at the LHC

This poster presents the analysis results of the diboson ($WW$ or $WZ$) resonances production search in pp collisions at $\sqrt{s} = 8$~TeV with the ATLAS detector at the LHC in 2012, using a total integrated luminosity of 20.3~fb$^{-1}$. The analysis is optimized by two benchmark signal models: Spin-2 Randall-Sundrum (RS~$G^*$) model for $WW$ and Spin-1 Extended Gauge Model (EGM~$W'$) for $WZ$ resonances. The search is performed for semileptonic final state, i.e. one $W$ boson decays to lepton (electron or muon) and neutrino and other $W$ or $Z$ --- hadronicaly. No significant excess for diboson resonances production is observed and upper limits on the production cross section times branching fraction of $G^*$ and $W'$ are determined at 95\%~CL. Resonance masses below 760~GeV for $G^*$ and 1490~GeV for $W'$ are excluded, that gives a significant improvement to the results over previously reported limits in the same final state.