Leptoquarks, Dark Matter, and Anomalous LHC Events

TL;DR

This paper explores leptoquark models that decay to dark matter and jets, potentially explaining recent CMS excesses, and discusses their experimental constraints and testability in future experiments.

Contribution

It introduces predictive leptoquark models that decay primarily to dark matter and jets, linking collider signals with dark matter detection constraints.

Findings

Leptoquark models can explain CMS excesses in $eejj$ and $e u jj$ channels.

Current data constrain leptoquark masses and couplings.

Upcoming experiments will test these models through direct detection and rare decay measurements.

Abstract

Leptoquarks with mass in the region of $550-650$ GeV are a possible candidate for the recent excess seen by CMS in the $eejj$ and $e \nu jj$ channels. We discuss models where leptoquarks decay primarily to dark matter and jets, thereby giving a branching to charged lepton and jet final states that can match data. The confluence of proton decay constraints, dark matter indirect and direct detection data, and Higgs invisible decay bounds results in a handful of predictive models that will be conclusively verified or excluded in upcoming direct detection experiments. Along the way, we present robust limits on such leptoquark models stemming from the muon magnetic moment using current and projected experiment sensitivities, as well as from $K$ and $B$ meson mixing, and leptonic and semi-leptonic meson decays.