Semileptonic WW/WZ resonance search at \sqrt{s} = 8 TeV with the ATLAS detector at the LHC

There are several physics models, which predict diboson resonances production. This poster presents the analysis 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 based on Spin-2 Randall-Sundrum graviton (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 is decayed to lepton (electron or muon) and neutrino and other W/Z to two jets. 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 700 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.