Search for Quark-Lepton Compositeness and a Heavy Wprime Boson Using the e-nu Channel in p-pbar Collisions at sqrt(s) = 1.8 TeV

TL;DR

This paper searches for signs of quark-lepton compositeness and a heavy W' boson in proton-antiproton collisions, setting new lower mass limits and compositeness scale constraints based on collision data.

Contribution

It provides the first combined limit on W' boson mass using electron and muon channels, and sets new bounds on quark-lepton compositeness scale at high-energy collisions.

Findings

Excluded quark-lepton compositeness scale below 2.81 TeV

Excluded W' boson mass below 754 GeV/c^2 (electron channel)

Excluded W' boson mass below 786 GeV/c^2 (combined channels)

Abstract

We present searches for quark-lepton compositeness and a heavy W' boson at high electron-neutrino transverse mass. We use ~110/pb of data collected in p-pbar collisions at sqrt(s) = 1.8 TeV by the CDF collaboration during 1992--95. The data are consistent with standard model expectations. Limits are set on the quark-lepton compositeness scale Lambda and the ratio of partial cross sections sigma (W' -> e nu) / sigma (W -> e nu). The cross section ratio is used to obtain a lower limit on the mass of a W' boson with standard model couplings. We exclude Lambda < 2.81 TeV and a W' boson with mass below 754 GeV/c^2 at the 95% confidence level. We combine the W' mass limit with our previously published limit obtained using the muon channel, to exclude a W' boson with mass below 786 GeV/c^2 at the 95% confidence level.