Energy-Energy Correlators in $e^+e^-$ and Deep Inelastic Scattering

TL;DR

This paper investigates energy-energy correlators in electron-positron annihilation and deep inelastic scattering, focusing on nonperturbative effects, factorization, and universality, and provides a matching scheme to describe data across different regimes.

Contribution

It introduces EEC jet functions, analyzes their IR behavior, and proposes a matching scheme to connect different kinematic regions, enhancing the understanding of EECs in various scattering processes.

Findings

Good agreement with EEC data and PYTHIA simulations in $e^+e^-$ annihilation.

Demonstrates factorization and universality of EECs.

Provides predictions for future electron-ion collider experiments.

Abstract

We study energy-energy correlators (EECs) in $e^+e^-$ annihilation and deep inelastic lepton-hadron scattering (DIS), focusing on aspects of nonperturbative physics in these observables. We introduce the EEC jet functions and investigate the infrared (IR) behavior of both small-angle EECs and angle-integrated EECs by performing explicit one-loop calculations. The factorization and universality of the EECs in these processes are demonstrated. A matching scheme is proposed to smoothly connect kinematic regions where different scaling behaviors with jet energy are observed. In combination with the next-to-leading order correction, this matching provides a good description of the EEC data and PYTHIA simulations in high-energy $e^+e^-$ annihilation. Predictions for DIS processes for future electron-ion collider kinematics are also presented.