Nuclear modification of leading hadrons and jets within a virtuality ordered parton shower

TL;DR

This paper develops a comprehensive event generator that models jet modification in nuclear collisions by combining a higher-twist energy loss formalism with hydrodynamic simulations, accurately describing experimental observations.

Contribution

It introduces a coupled framework integrating a higher-twist formalism with hydrodynamics for detailed jet modification modeling in nuclear collisions.

Findings

Successfully describes nuclear modification of high-pT hadrons and jets

Incorporates full parton shower evolution including space-time dynamics

Provides a realistic simulation matching experimental data

Abstract

The event generator based on the higher-twist energy loss formalism -- Modular All Twist Transverse-scattering Elastic-drag and Radiation (MATTER) -- is further developed and coupled to a hydrodynamic model for studying jet modification in relativistic nuclear collisions. The probability of parton splitting is calculated using the Sudakov form factor that is constructed by a combination of vacuum and medium-induced splitting functions; and the full parton showers are simulated, including both energy-momentum and space-time evolutions of all jet partons. With the assumption that partons below a virtual scale of 1 GeV is absorbed by the medium, this framework is able to provide a reasonable description of the nuclear modification of both leading hadrons and jets at high transverse momentum at the BNL Relativistic Heavy Ion Collider and the CERN Large Hadron Collider.