Monte Carlo for Jet Showers in the Medium

TL;DR

This paper introduces a Monte Carlo approach to simulate jet showers in a medium, extending existing formalisms to better model reconstructed jets in heavy-ion collisions.

Contribution

It presents Q-PYTHIA, a new implementation of radiative energy loss within a jet parton shower in the PYTHIA Monte Carlo generator, addressing limitations of previous models.

Findings

Demonstrates the implementation of medium-modified jet showers in PYTHIA

Provides initial physics results showing the impact of medium effects on jets

Offers a publicly available tool for future jet quenching studies

Abstract

The most commonly employed formalisms of radiative energy loss have been derived in the high- energy approximation. In its present form, it is reliable only for the medium modifications of inclusive particle spectra. Modifications to this formalism are expected to be important for less inclusive measurements. This is especially relevant for reconstructed jets in heavy-ion collisions, which are becoming available only recently. We present some ideas to overcome this limitation. Specifically, we show an implementation of radiative energy loss within a jet parton shower. This implementation has been done within the PYTHIA Monte Carlo event generator. We present the publicly available routine Q-PYTHIA and discuss some of the obtained physics results.