Search for W'->tb resonances with left- and right-handed couplings to fermions

TL;DR

This paper searches for a hypothetical W' boson decaying to third-generation quarks in proton-antiproton collisions, setting new limits on its mass and couplings for various chiral scenarios, thus constraining new physics models.

Contribution

First to set limits on W' boson production with arbitrary combinations of left- and right-handed couplings at Tevatron energies.

Findings

Excluded W' masses below 863 GeV for purely left-handed couplings.

Excluded W' masses below 885 GeV for purely right-handed couplings.

Excluded W' masses below 916 GeV for mixed couplings.

Abstract

We present a search for the production of a heavy gauge boson, W', that decays to third-generation quarks, by the D0 Collaboration in ppbar collisions at sqrt(s)= 1.96 TeV. We set 95% confidence level upper limits on the production cross section times branching fraction. For the first time, we set limits for arbitrary combinations of left- and right-handed couplings of the W' boson to fermions. For couplings with the same strength as the standard model W boson, we set the following limits for M(W') > m(nu_R): M(W')>863 GeV for purely left-handed couplings, M(W')>885 GeV for purely right-handed couplings, and M(W')>916 GeV if both left- and right-handed couplings are present. The limit for right-handed couplings improves for M(W') < m(nu_R) to M(W')>890 GeV.