Abstract
A search for heavy, right-handed neutrinos, mathrm {N}_{ell } (ell = mathrm {e}, mu ), and right-handed mathrm {W}_{mathrm {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,text {TeV} corresponding to an integrated luminosity of 19.7 mathrm{fb}^{-1}. For models with strict left-right symmetry, and assuming only one mathrm {N}_{ell } flavor contributes significantly to the mathrm {W}_{mathrm {R}} decay width, the region in the two-dimensional (M_{mathrm {W}_{mathrm {R}}}, M_{mathrm {N}_{ell }}) mass plane excluded at a 95 % confidence level extends to approximately M_{mathrm {W}_{mathrm {R}}} = 3.0,text {TeV} and covers a large range of neutrino masses below the mathrm {W}_{mathrm {R}} boson mass, depending on the value of M_{mathrm {W}_{mathrm {R}}}. This search significantly extends the (M_{mathrm {W}_{mathrm {R}}}, M_{mathrm {N}_{ell }}) exclusion region beyond previous results.Electronic supplementary materialThe online version of this article (doi:10.1140/epjc/s10052-014-3149-z) contains supplementary material, which is available to authorized users.
Highlights
The standard model (SM) [1,2,3] explicitly incorporates the parity violation observed in weak interactions through the use of a left-handed chiral SUL (2) gauge group which includes the left-handed gauge bosons WL± and ZL
The LR extensions introduce an additional right-handed SUR(2) symmetry group to the SM, which includes heavy charged (WR±) and neutral (ZR) gauge bosons that could be produced at LHC energies
In addition to addressing parity non-conservation in weak interactions, LR theories provide an explanation for the Electronic supplementary material The online version of this article contains supplementary material, which is available to authorized users
Summary
The standard model (SM) [1,2,3] explicitly incorporates the parity violation observed in weak interactions through the use of a left-handed chiral SUL (2) gauge group which includes the left-handed gauge bosons WL± and ZL. T√his search, which expands upon a previous search using s = 7 TeV data [13], assumes the production of a WR boson that decays to a charged lepton (we consider = e, μ) and to a right-handed neutrino N. The potential Majorana nature of the right-handed neutrinos implies the final-state charged leptons can have the same sign, we do not impose any charge requirements on the final-state electrons or muons in this analysis. This search is characterized by the masses of the WR boson (MWR ) and the right-handed neutrino N (MN ), which are allowed to vary independently. The energy of neutral hadrons is obtained from the corresponding corrected ECAL and HCAL energy
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