First Limits on Left-Right Symmetry Scale from LHC Data

TL;DR

This paper uses early LHC data to set a lower limit on the Left-Right symmetry scale by searching for a specific gauge boson, establishing M_WR > 1.4 TeV at 95% confidence level.

Contribution

First experimental limit on the Left-Right symmetry scale from LHC data, constraining the mass of the right-handed W boson using 7 TeV collision data.

Findings

No signal observed beyond Standard Model background.

Lower bound on W_R mass set at 1.4 TeV.

Results valid for certain neutrino mass ranges.

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/pb integrated luminosity and 7 TeV center-of-mass energy. In the absence of a signal beyond the Standard Model background, we set the bound M_WR > 1.4 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 cancelation in right-handed lepton mixings.