Search for heavy neutrinos and W bosons with right-handed couplings in proton–proton collisions at √s = 8 TeV

A search for heavy, right-handed neutrinos, N_l (l = e,μ), and right-handed W_R bosons, which arise in the left-right symmetric extensions of the standard model, has been performed by the CMS experiment. The search was based on a sample of two lepton plus two jet events collected in proton–proton collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb⁻¹. For models with strict left-right symmetry, and assuming only one N_l flavor contributes significantly to the W_R decay width, the region in the two-dimensional (M_WR , M_Nl ) mass plane excluded at a 95% confidence level extends to approximately M_WR = 3.0 TeV and covers a large range of neutrino masses below the W_R boson mass, depending on the valueof M_WR . This search significantly extends the (M_WR , M_Nl ) exclusion region beyond previous results.