Exploring Jet Substructure in Semi-visible jets

TL;DR

This paper investigates the unique features of semi-visible jets produced in dark sectors, comparing their substructure to standard jets using simulations, to understand model dependence and potential detection strategies.

Contribution

It provides a detailed comparison of jet substructure observables for semi-visible jets across different dark hadron fractions, highlighting model-dependent effects.

Findings

Semi-visible jets exhibit distinct substructure signatures compared to light quark/gluon jets.

The dark hadron fraction significantly influences jet substructure observables.

Decoupling inherent semi-visible jet properties from model dependence is feasible.

Abstract

Semi-visible jets arise in strongly interacting dark sectors, where parton evolution includes dark sector emissions, resulting in jets overlapping with missing transverse momentum. The implementation of semi-visible jets is done using the Pythia Hidden valley module to duplicate the QCD sector showering. In this work, several jet substructure observables have been examined to compare semi-visible jets and light quark/gluon jets. These comparisons were performed using different dark hadron fraction in the semi-visible jets (signal). The extreme scenarios where signal consists either of entirely dark hadrons or visible hadrons offers a chance to understand the effect of the specific dark shower model employed in these comparisons. We attempt to decouple the behaviour of jet-substructure observables due to inherent semi-visible jet properties, from model dependence owing to the existence of only one dark shower model as mentioned above.