Two-particle angular correlations in the search for new physics at future $e^+e^-$ colliders

TL;DR

This paper explores how two-particle angular correlations at future electron-positron colliders could reveal new physics, like Hidden Valley sectors, through ridge-like structures in particle correlations.

Contribution

It introduces a novel approach to detect Hidden Valley scenarios by analyzing angular correlations in a cleaner collider environment.

Findings

Potential observation of ridge-like structures in angular correlations.

Enhanced correlations due to massive Hidden Valley quarks.

Feasibility of using angular correlations to discover new physics at $e^+e^-$ colliders.

Abstract

The analysis of angular particle correlations can yield valuable insights into the initial state of matter in high-energy collisions, thereby potentially revealing the existence of Beyond the Standard Model scenarios such as Hidden Valley (HV). In this study, we focus on a QCD-like hidden sector with relatively massive HV quarks ($\lesssim 100$~GeV) which might enlarge and strengthen azimuthal correlations of final-state SM hadrons. In particular, we study the formation and possible observation of \textit{ridge-like} structures in the angular two-particle correlation function at future $e^+e^-$ colliders, with a much cleaner environment than in hadron colliders, such as the LHC.