Search for Right-Handed $W$ Bosons and Heavy $W^\prime$ in $p\bar p$ Collisions at $\sqrt{s} =$1.8 TeV

TL;DR

This paper reports a search for right-handed W bosons ($W_R$) at the Fermilab Tevatron, setting new mass limits based on electron decay channels, and also constrains heavy $W^ extprime$ bosons with various neutrino mass assumptions.

Contribution

First to set experimental mass limits on $W_R$ and $W^ extprime$ bosons using Tevatron data, independent of neutrino decay modes.

Findings

Excluded $W_R$ masses below 650 GeV/c$^2$ for certain neutrino masses.

Set a new lower limit of 720 GeV/c$^2$ on $W^ extprime$ mass.

Provided constraints on $W_R$ for larger neutrino masses assuming specific decay channels.

Abstract

We report on a search for right-handed $W$ bosons ($W_R$). We used data collected with the D{\O} detector at the Fermilab Tevatron $p\bar p$ collider at $\sqrt{s}=$1.8 TeV to search for $W_R$ decays into an electron and a massive right-handed neutrino $W_R^\pm \to e^\pm N_R$. Using the inclusive electron data, we set mass limits independent of the $N_R$ decay: $m_{W_R}>650$ GeV/c$^2$ and $m_{W_R}>720$ GeV/c$^2$ at the 95% confidence level, valid for $m_{N_R}<{1/2}m_{W_R}$ and $m_{N_R} \ll m_{W_R}$ respectively. The latter also represents a new lower limit on the mass of a heavy left-handed $W$ boson ($W^\prime$) decaying into $e \nu$. In addition, limits on $m_{W_R}$ valid for larger values of the $N_R$ mass are obtained assuming that $N_R$ decays to an electron and two jets.