Dark Sector Showers in the Lund Jet Plane

TL;DR

This paper explores how the Lund jet plane can be used to identify dark sector jets at the LHC, which are challenging to distinguish from Standard Model jets due to unknown dark hadronization effects.

Contribution

It demonstrates that the Lund jet plane is a robust tool for designing substructure observables that are less affected by dark hadronization uncertainties.

Findings

Lund jet plane effectively distinguishes dark sector jets from Standard Model jets.

Substructure observables based on the Lund plane are resilient to dark hadronization effects.

Provides a new approach for dark sector jet analysis at colliders.

Abstract

We investigate the consequences of models where dark sector quarks could be produced at the LHC, which subsequently undergo a dark parton shower, generating jets of dark hadrons that ultimately decay back to Standard Model hadrons. This yields collider objects that can be nearly indistinguishable from Standard Model jets, motivating the reliance on substructure observables to tease out the signal. However, substructure predictions are sensitive to the details of the incalculable dark hadronization. We show that the Lund jet plane provides a very effective tool for designing observables that are resilient against the unknown impact of dark hadronization on the substructure properties of dark sector jets.