Search for Charge 1/3 Third Generation Leptoquarks in pbarp Collisions at sqrt(s)=1.8 TeV

TL;DR

This paper reports a search for third generation leptoquarks in proton-antiproton collisions at 1.8 TeV, setting mass limits based on decay channels involving tau neutrinos and b quarks.

Contribution

It provides the first experimental mass limits for charge 1/3 third generation scalar and vector leptoquarks at Tevatron energies.

Findings

Excluded scalar leptoquarks with mass below 94 GeV/c^2.

Excluded vector leptoquarks with mass below 216 GeV/c^2 (Yang-Mills coupling).

Set upper limits on production cross section times branching ratio.

Abstract

We report on a search for charge 1/3 third generation leptoquarks (LQ) produced in pbarp collisions at sqrt(s) = 1.8 TeV using the D0 detector at Fermilab. Third generation leptoquarks are assumed to be produced in pairs and to decay to a tau neutrino and a b quark with branching fraction B. We place upper limits on sigma(pbarp to LQbarLQ)xB^2 as a function of the leptoquark mass M_LQ. Assuming B =1, we exclude at the 95% confidence level third generation scalar leptoquarks with M_LQ<94 GeV/c^2, and third generation vector leptoquarks with M_LQ<216 GeV/c^2 (M_LQ<148 GeV/c^2) assuming Yang-Mills (anomalous) coupling.