A robust measure of event isotropy at colliders

Cari Cesarotti; Jesse Thaler

doi:10.1007/jhep08(2020)084

journal article Open Access Aug 01, 2020

A robust measure of event isotropy at colliders

Cari Cesarotti

Jesse Thaler

Journal of High Energy Physics Vol. 2020 No. 8 · Springer Science and Business Media LLC

View at Publisher Save 10.1007/jhep08(2020)084

Abstract

Abstract
We introduce a new event shape observable — event isotropy — that quantifies how close the radiation pattern of a collider event is to a uniform distribution. This observable is based on a normalized version of the energy mover’s distance, which is the minimum “work” needed to rearrange one radiation pattern into another of equal energy. We investigate the utility of event isotropy both at electron-positron colliders, where events are compared to a perfectly spherical radiation pattern, as well as at proton-proton colliders, where the natural comparison is to either cylindrical or ring-like patterns. Compared to traditional event shape observables like sphericity and thrust, event isotropy exhibits a larger dynamic range for high-multiplicity events. This enables event isotropy to not only distinguish between dijet and multijet processes but also separate uniform N-body phase space configurations for different values of N. As a key application of this new observable, we study its performance to characterize strongly-coupled new physics scenarios with isotropic collider signatures.

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A robust measure of event isotropy at colliders

Cari Cesarotti, Jesse Thaler · 2020

Journal of High Energy Physics

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Published: Aug 01, 2020
Vol/Issue: 2020(8)
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Cari Cesarotti, Jesse Thaler (2020). A robust measure of event isotropy at colliders. Journal of High Energy Physics, 2020(8). https://doi.org/10.1007/jhep08(2020)084

A robust measure of event isotropy at colliders

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