Effects of the formation time of parton shower on jet quenching in heavy-ion collisions

Abstract

Jet quenching has successfully served as a hard probe to study the properties of Quark-Gluon Plasma (QGP). As a multi-particle system, jets take time to develop from a highly virtual parton to a group of partons close to mass shells. In this study, we present a systematical study on the effects of this formation time on jet quenching in relativistic nuclear collisions. Jets from initial hard scatterings were simulated with Pythia, and their interactions with QGP were described using a Linear Boltzmann Transport (LBT) model that incorporates both elastic and inelastic scatterings between jet partons and the thermal medium. Three different estimations of the jet formation time were implemented and compared, including instantaneous formation, formation from single splitting, and formation from sequential splittings, before which no jet-medium interaction was assumed. We found that deferring the jet-medium interaction with a longer formation time not only affects the overall magnitude of the nuclear modification factor of jets, but also its dependence on the jet transverse momentum.

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• Jet momentum reconstruction in the QGP background with machine learning
• Geometric Bias and Centrality Dependence of Jet Quenching in High-Energy Nuclear Collisions
• Contrasting Features of Parton Energy Loss in Heavy-ion Collisions at RHIC and the LHC
• Emergence of thermal recoil jets in high-energy heavy-ion collisions
• Deep learning for jet modification in the presence of the QGP background
• Exploring system size dependence of jet modification in heavy-ion collisions