Search for third-generation leptoquarks in ppbar collisions at sqrt(s)=1.96 TeV

TL;DR

This paper reports a search for third-generation leptoquarks in proton-antiproton collisions at 1.96 TeV, setting new mass exclusion limits based on decay channels involving tau neutrinos and b quarks.

Contribution

First search for third-generation scalar leptoquarks at Tevatron, establishing mass exclusion limits up to 229 GeV for B=1.

Findings

Excluded third-generation scalar leptoquarks with mass below 229 GeV at 95% CL

Set upper limits on production cross section times branching fraction squared

Provided constraints on leptoquark models involving tau neutrinos and b quarks

Abstract

We report on a search for charge-1/3 third-generation leptoquarks (LQ) produced in ppbar collisions at sqrt(s)=1.96 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(ppbar->LQLQbar)*B^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} < 229 GeV.