Search for heavy resonances, and resonant diboson production with the ATLAS detector

Heavy resonances decaying into a pair of fundamental particles such as $jj$, $\ell^+\ell^-$, $\gamma\gamma$ and $\ell\nu$, are an obvious place to look for phenomena beyond the standard model (SM). Electroweak boson pair production, such as $WW$ or $ZZ$ with subsequent decays to $\ell\nu\ell'\nu'$ and $\ell\ell jj$ respectively, is a powerful test of the spontaneously broken gauge symmetry of the SM and can be also used to search for phenomena beyond the SM. There is a wide spectrum of theoretical models and motivations predicting these kinds of resonant signatures. This presentation covers several searches for these new phenomena conducted within ATLAS in 2011 and 2012 for 7 and 8 TeV respectively. No significant deviations from the SM have been observed and therefore, limits are set on the characteristic parameters of several new physics models. These benchmark models include new heavy $Z'/W'$ gauge bosons, chiral excitation of the SM weak gauge bosons, $Z^*/W^*$, Randal-Sundrum and ADD gravitons, Composite models for quarks, e.g. $q^*$ with substructure scale $\Lambda$, Quantum black holes, Low scale strings with large extra dimensions, TeV$^{-1}$ Kaluza-Klein excitation of $\gamma/Z$, Torsion and Technicolor.