Search for the Production of Narrow tb Resonances in 1.9 fb-1 of ppbar Collisions at sqrt(s) = 1.96 TeV

TL;DR

This paper reports new experimental limits on narrow resonant tb production at the Tevatron, excluding W' bosons below 800 GeV and constraining their coupling strengths, based on 1.9 fb^-1 of data.

Contribution

It provides the first limits on narrow W' resonances in the tb channel at Tevatron energies, improving previous constraints and exploring a new mass and coupling parameter space.

Findings

Excluded W' masses below 800 GeV at 95% C.L.

Set upper cross-section limits of 0.28 pb for resonances between 750 and 950 GeV.

Presented coupling strength exclusions over 300 to 950 GeV.

Abstract

We present new limits on resonant tb production in proton-antiproton collisions at 1.96 TeV, using 1.9 fb^-1 of data recorded with the CDF II detector at the Fermilab Tevatron. We reconstruct a candidate mass in events with a lepton, neutrino candidate, and two or three jets, and search for anomalous tb production as modeled by W'->tb. We set a new limit on a right-handed W' with standard model-like coupling, excluding any mass below 800 GeV at 95% C.L. The cross-section for any narrow, resonant tb production between 750 and 950 GeV is found to be less than 0.28 pb at 95% C.L. We also present an exclusion of the W' coupling strength versus W' mass over the range 300 to 950 GeV.