Search for W' decaying to tau lepton and neutrino in proton-proton collisions at sqrt(s) = 8 TeV

TL;DR

This paper reports the first search for a heavy W' boson decaying to tau leptons and neutrinos at 8 TeV, setting new exclusion limits up to 2.7 TeV with no observed excess.

Contribution

It provides the first experimental search for W' bosons decaying to tau and neutrino final states at the LHC, extending previous constraints significantly.

Findings

Excluded W' masses below 2.0 to 2.7 TeV depending on model parameters.

Excluded universal fermion coupling W' bosons below 2.7 TeV.

No excess events observed over standard model background.

Abstract

The first search for a heavy charged vector boson in the final state with a tau lepton and a neutrino is reported, using 19.7 inverse femtobarns of LHC data at sqrt(s) = 8 TeV. A signal would appear as an excess of events in kinematic regions where the standard model background is low. No excess is observed. Limits are set on a model in which the W' decays preferentially to fermions of the third generation. These results substantially extend previous constraints on this model. Masses below 2.0 to 2.7 TeV are excluded, depending on the model parameters. In addition, the existence of a W' boson with universal fermion couplings is excluded at 95% confidence level, for W' masses below 2.7 TeV. For further reinterpretation a model-independent limit on potential signals for various transverse mass thresholds is also presented.