Medium Recoils and background subtraction in JEWEL

TL;DR

This paper discusses the implementation of background subtraction methods in the JEWEL event generator to accurately account for medium recoils, improving the description of jet shape observables in dense QCD media.

Contribution

It introduces two independent background subtraction procedures in JEWEL and analyzes their impact on jet observables, emphasizing the importance of medium recoil tracking.

Findings

Recoil tracking enhances jet shape predictions.

Background subtraction methods affect jet-background correlation results.

JEWEL's description of jet shape observables improves with recoil consideration.

Abstract

\textsc{Jewel} is a fully dynamical event generator for jet evolution in a dense QCD medium, which has been validated for multiple jet and jet-like observables. Jet constituents (partons) undergo collisions with thermal partons from the medium, leading to both elastic and radiative energy loss. The recoiling medium scattering centers carry away energy and momentum from the jet. Keeping track of these recoils is essential for the description of intra-jet observables. Since the thermal component of the recoils is part of the soft background activity, comparison with data on jet observables requires the implementation of a background subtraction procedure. We will show two independent procedures through which background subtraction can be performed and discuss the impact of the medium recoil on jet shape observables and jet-background correlations. Keeping track of the medium recoil significantly improves the \textsc{Jewel} description of jet shape measurements.