Поиск $W_R$-бозона и тяжелого нейтрино на детекторе ATLAS

This thesis comprises the results obtained for $W_R$-boson and heavy neutrino searches with the ATLAS detector at LHC. The new $W_R$-boson and heavy right-handed neutrino (N) are introduced in the framework of Left-Right Symmetric Model (LRSM). The search for $W_R$-boson and N is performed in the final state with two high-$P_T$ leptons and jets in $pp \to W_R \to \ell N \to \ell \ell j j$ process with 2.1~$fb^{-1}$ of data recorded during proton-proton collisions at $\sqrt{s} =$~7~TeV. The description of the selection criteria and the methods to estimate background is given. No significant deviations from the Standard Model expectations are observed and the limits on the masses of $W_R$-boson and N are set. The $W_R$-boson with the mass less than ($\simeq$~1.8~TeV) 2.3~TeV is excluded for the mass difference of $W_R$-boson and $N$ greater than 0.3~TeV (0.9~TeV). The obtained limits represent the most stringent limits to date of thesis completion for the masses of these new particles.