Novel subjet observables for jet quenching in heavy-ion collisions

TL;DR

This paper introduces a new jet substructure observable, S_{12}, which effectively distinguishes different jet quenching models in heavy-ion collisions and is experimentally robust against background noise.

Contribution

The paper proposes S_{12} as a novel, safe, and background-resistant observable for analyzing jet modifications in dense media, validated through Monte Carlo simulations.

Findings

S_{12} effectively discriminates between jet quenching models.

It remains safe under colinear and infrared conditions.

It shows resilience against heavy-ion collision backgrounds.

Abstract

Using a novel observable that relies on the momentum difference of the two most energetic subjets within a jet $\Delta S_{12}$ we study the internal structure of high-energy jets simulated by several Monte Carlo event generators that implement the partonic energy-loss in a dense partonic medium. Based on inclusive jet and di-jet production we demonstrate that $\Delta S_{12}$ is an effective tool to discriminate between different models of jet modifications over a broad kinematic range. The new quantity, while preserving the colinear and infrared safety of modern jet algorithms, it is experimentally attractive because of its inherent resiliance against backgrounds of heavy-ion collisions.