Measurement of the energy-energy correlator in the back-to-back limit using the archived ALEPH $e^{+}e^{-}$ data at 91.2 GeV

TL;DR

This paper analyzes energy-energy correlators in archived ALEPH data from LEP at 91.2 GeV to study QCD phenomena in electron-positron collisions, focusing on the back-to-back limit and jet regimes.

Contribution

It presents the first measurement of EECs in the back-to-back limit using archived LEP data, bridging perturbative and non-perturbative QCD insights.

Findings

EEC results in the back-to-back limit are consistent with theoretical predictions.

Comparison with event generators shows areas for model improvement.

The study demonstrates the potential of archived LEP data for modern QCD analyses.

Abstract

Recently, energy-energy correlators (EECs) have garnered renewed interest for studying hadronic collisions at the Large Hadron Collider (LHC) and the Relativistic Heavy Ion Collider (RHIC). EEC measurements within jets provide a clear scale separation, facilitating the study of both perturbative and non-perturbative Quantum Chromodynamics (QCD) in the collinear limit. These proceedings present recent EEC results from the archived ALEPH $e^{+}e^{-}$ data taken at LEP at $\sqrt{s}$ = 91.2 GeV. In $e^{+}e^{-}$ collisions, perturbative and non-perturbative QCD can be studied with EECs in both the collinear limit using jets and the back-to-back limit using all particles as well as the transition between these two regimes. Comparisons of these results to generators and future extensions of this work will also be discussed.