Search for Quark-Lepton Compositeness and a Heavy $W^{\prime }$ Boson Using the $\mathit{e}\nu$ Channel in $\mathit{p}\overline{p}$ Collisions at $\sqrt{\mathit{s}}=1.8\mathrm{}\mathrm{TeV}$

We present searches for quark-lepton compositeness and a heavy $W^{\prime }$ boson at high electron-neutrino transverse mass. We use $\sim 110{\mathrm{pb}}^{-1\mathrm{}}$ of data collected in $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{}\mathrm{TeV}$ by the CDF Collaboration during 1992–1995. The data are consistent with standard model expectations. Limits are set on the quark-lepton compositeness scale $\Lambda$, the ratio of partial cross sections $\sigma (W^{\prime }\to e\nu )/\sigma (W\to e\nu )$, and the mass of a $W^{\prime }$ boson with standard model couplings. We exclude $\Lambda <2.81\mathrm{}\mathrm{TeV}$ and a $W^{\prime }$ boson with mass below $754\mathrm{GeV}{/c}^2$ at the $95\%$ confidence level. Combining with our previously published limit obtained using the muon channel, we exclude a $W^{\prime }$ boson with mass below $786\mathrm{GeV}{/c}^2$ at the $95\%$ confidence level.