Search for first generation leptoquark pair production in the electron + missing energy + jets final state

TL;DR

This paper reports a search for first generation scalar leptoquark pair production in proton-antiproton collisions, finding no excess and setting a lower mass limit of 326 GeV at 95% confidence level.

Contribution

It provides the first experimental lower mass limit for first generation scalar leptoquarks in the specified decay channel at the Tevatron.

Findings

No significant excess observed over background.

Lower mass limit of 326 GeV set for leptoquarks.

Results constrain leptoquark models at Tevatron energies.

Abstract

We present a search for the pair production of first generation scalar leptoquarks (LQ) in data corresponding to an integrated luminosity of 5.4 fb$^{-1}$ collected with the D0 detector at the Fermilab Tevatron Collider in ppbar collisions at $\sqrt{s}=1.96$ TeV. In the channel $LQ \bar{LQ} \rightarrow e\nu_e qq'$, where q, q' are u or d quarks, no significant excess of data over background is observed, and we set a 95% C.L. lower limit of 326 GeV on the leptoquark mass, assuming equal probabilities of leptoquark decays to eq and $\nu_e q'$.