Limits on the left-right symmetry scale and heavy neutrinos from early LHC data

Abstract

We use the early Large Hadron Collider data to set the lower limit on the scale of left-right symmetry, by searching for the right-handed charged gauge boson ${W}_{R}$ via the final state with two leptons and two jets, for $33\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ integrated luminosity and 7 TeV center-of-mass energy. This signal is kinematically observable for right-handed neutrino lighter than ${W}_{R}$. In the absence of a signal beyond the standard model background, we set the bound ${M}_{{W}_{R}}\ensuremath{\gtrsim}1.4\text{ }\text{ }\mathrm{TeV}$ at 95% C.L.. This result is obtained for a range of right-handed neutrino masses of the order of few 100 GeV, assuming no accidental cancellation in right-handed lepton mixings.