Search for Second Generation Leptoquark Pairs in pbar-p Collisions at sqrt(s) = 1.8 TeV

TL;DR

This study searched for second generation leptoquark pairs in proton-antiproton collisions at 1.8 TeV, setting mass limits based on null results across multiple decay channels, thereby constraining leptoquark models.

Contribution

First combined analysis of multiple decay channels to set the most stringent mass limits on second generation leptoquarks at the Tevatron.

Findings

No evidence for leptoquark production was observed.

Mass limits of 200 GeV/c^2 for scalar leptoquarks with beta=1.

Mass limits of 180 GeV/c^2 for scalar leptoquarks with beta=1/2.

Abstract

We have searched for second generation leptoquark (LQ) pairs in the \mu\mu+jets channel using 94+-5 pb^{-1} of pbar-p collider data collected by the D0 experiment at the Fermilab Tevatron during 1993-1996. No evidence for a signal is observed. These results are combined with those from the \mu\nu+jets and \nu\nu+jets channels to obtain 95% confidence level (C.L.) upper limits on the LQ pair production cross section as a function of mass and $beta, the branching fraction of a LQ decay into a charged lepton and a quark. Lower limits of 200(180) GeV/c^2 for \beta=1(1/2) are set at the 95% C.L. on the mass of scalar LQ. Mass limits are also set on vector leptoquarks as a function of \beta.