A perturbative framework for jet quenching

TL;DR

This paper introduces a new perturbative QCD-based framework integrated into the JEWEL Monte Carlo generator to simulate jet evolution in dense nuclear media, accurately modeling medium-induced gluon emissions and interference effects.

Contribution

It presents a novel, theoretically consistent perturbative framework for jet quenching, incorporating interference effects and implemented in a Monte Carlo generator, validated against experimental data.

Findings

Good agreement with RHIC and LHC jet quenching data

Quantification of dominant uncertainties in jet quenching simulations

Effective modeling of medium-induced gluon emissions and interference effects

Abstract

We present a conceptually new framework for describing jet evolution in the dense medium produced in ultra-relativistic nucleus-nucleus collisions using perturbative QCD and its implementation into the Monte Carlo event generator JEWEL. The rescattering of hard partons in the medium is modelled by infrared continued pQCD matrix elements supplemented with parton showers. The latter approximate higher order real-emission matrix elements and thus generate medium-induced gluon emissions. The interplay between different emissions is governed by their formation times. The destructive interference between subsequent scattering processes, the non-Abelian version of the Landau-Pomeranchuk-Migdal effect, is also taken into account. In this way the complete radiation pattern is consistently treated in a uniform way. Results obtained within this minimal and theoretically well constrained framework are compared with a variety of experimental data susceptible to jet-quenching effects at both RHIC and the LHC. Overall, a good agreement between data and simulation is found. This new framework also allows to identify and quantify the dominant uncertainties in the simulation, and we show some relevant examples for this.