Single Production of Leptoquarks at the Tevatron

TL;DR

This paper investigates the potential to detect first-generation leptoquarks at the Fermilab Tevatron through single production channels, analyzing signal and background to extend search sensitivity across various couplings.

Contribution

It provides a detailed analysis of single leptoquark production in association with a lepton, highlighting how this mode can improve mass exclusion limits for different Yukawa couplings.

Findings

Excludes leptoquarks up to 285 GeV at Run I for electromagnetic strength couplings.

Extends exclusion limits up to 425 GeV at Run II.

Shows the significance of single production channels in leptoquark searches.

Abstract

We study the single production of first generation leptoquarks in association with a e+/- at the Fermilab Tevatron. We focus our attention on final states exhibiting a e+e- pair and jets, and perform a detailed analyses of signal and backgrounds. The single leptoquark production cross section depends on the leptoquark Yukawa coupling to lepton-quark pairs and we show that the study of this mode can extend considerably the leptoquark search for a large range of these couplings. In fact, for Yukawa couplings of the electromagnetic strength, the combined results of the Tevatron experiments can exclude the existence of leptoquarks with masses up to 260--285 (370--425) GeV at the RUN I (RUN II), depending on their type.