Search for heavy neutrinos and W[R] bosons with right-handed couplings in a left-right symmetric model in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports a search for heavy right-handed neutrinos and W[R] bosons in proton-proton collisions at 7 TeV, setting new exclusion limits on their masses within left-right symmetric models.

Contribution

It provides the first experimental constraints on heavy neutrinos and W[R] bosons in left-right symmetric models at 7 TeV collision energy.

Findings

No excess events observed over standard model predictions.

Heavy right-handed neutrinos are excluded below certain masses depending on W[R] mass.

W[R] bosons are excluded up to 2.5 TeV mass.

Abstract

Results are presented from a search for heavy, right-handed muon neutrinos, N[mu], and right-handed W[R] bosons, which arise in the left-right symmetric extensions of the standard model. The analysis is based on a 5.0 inverse femtobarn sample of proton-proton collisions at a center-of-mass energy of 7 TeV, collected by the CMS detector at the Large Hadron Collider. No evidence is observed for an excess of events over the standard model expectation. For models with exact left-right symmetry, heavy right-handed neutrinos are excluded at 95% confidence level for a range of neutrino masses below the W[R] mass, dependent on the value of M(W[R]). The excluded region in the two-dimensional (M(W[R]), M(N[mu])) mass plane extends to M(W[R]) = 2.5 TeV.