Understanding wide jet suppression in data through the hybrid strong/weak coupling model

TL;DR

This paper uses a hybrid strong/weak coupling model to analyze jet substructure observables, revealing that wider jets with more splittings tend to lose more energy, aligning with experimental data.

Contribution

It introduces a novel application of the hybrid model to jet substructure observables like $n_{SD}$ and $z_g$, providing insights into jet quenching mechanisms.

Findings

Wider jets with more splittings lose more energy.

The model's results align qualitatively with ALICE and CMS data.

Background fluctuations affect the interpretation of jet quenching observables.

Abstract

We explore a set of jet substructure observables that use grooming techniques such as the Soft Drop procedure by performing simulations with the hybrid strong/weak coupling model for jet quenching. The results obtained for the observables presented in this proceedings, namely the number of Soft Drop splittings, or $n_{\rm SD}$, and the sharing momentum distribution $z_g$ for different angular cuts between the two main branches in a jet, can be easily understood as arising from the fact that among all the jets with a given jet $p_T$, those jets which are wider in opening angle, meaning that they have a higher jet mass and come from showers featuring more splittings, tend to lose more energy than the narrower jets. We comment on the comparison to data from ALICE and CMS, and point out the caveats arising from the consideration of smearing effects due to the presence of a large fluctuating background.